| **Stock-Based and Other Compensation Plans (Details 2) (USD $)In Millions, except Share data, unless otherwise specified**              | 12 Months Ended                                                                                                                                                                                                                                                          |
|-----------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **Stock option activity [Rollforward]**                                                                                                 |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Exercised (in shares)                                                                                                                   | (1,459,490)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                                                                                                                                                                                                    |  | (1,892,962)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |   |  |
| **Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]**                                                         |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Deferred Compensation Arrangement with Individual, Compensation Expense                                                                 | $ (25)us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense                                                                                                                                                                                           | [1] | $ 26us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | [1] | $ 6us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | [1] |
| Stock Option [Member]                                                                                                                   |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| **Assumptions used to value stock option awards [Abstract]**                                                                            |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Expected term (in years)                                                                                                                | 5 years 10 months 24 days                                                                                                                                                                                                                                                |  | 5 years 8 months |  | 5 years 8 months |  |
| Expected volatility (in hundredths)                                                                                                     | 35.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                      |  | 36.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  | 37.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  |
| Risk-free rate (in hundredths)                                                                                                          | 1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                         |  | 1.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  | 0.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  |
| Expected dividend yield (in hundredths)                                                                                                 | 1.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                         |  | 1.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  | 1.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  |
| Weighted-average grant-date fair value of options granted (in dollars per share)                                                        | $ 20.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                         |  | $ 17.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  | $ 15.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  |
| **Stock option activity [Rollforward]**                                                                                                 |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Outstanding, beginning balance (in shares)                                                                                              | 12,677,857us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                                    |  |   |  |   |  |
| Granted (in shares)                                                                                                                     | 2,186,232us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                                        |  |   |  |   |  |
| Exercised (in shares)                                                                                                                   | (1,459,490)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                                                                  |  |   |  |   |  |
| Forfeited (in shares)                                                                                                                   | (396,277)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                     |  |   |  |   |  |
| Outstanding, ending balance (in shares)                                                                                                 | 13,008,322us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                                    |  | 12,677,857us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  |   |  |
| Exercisable (in shares)                                                                                                                 | 8,993,726us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                                     |  |   |  |   |  |
| **Stock option activity, additional disclosures [Abstract]**                                                                            |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Weighted average exercise price per share outstanding, beginning balance (in dollars per share)                                         | $ 39.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                 |  |   |  |   |  |
| Weighted average exercise price per share granted (in dollars per share)                                                                | $ 62.61us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                             |  |   |  |   |  |
| Weighted average exercise price per share exercised (in dollars per share)                                                              | $ 32.39us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                          |  |   |  |   |  |
| Weighted average exercise price per share forfeited (in dollars per share)                                                              | $ 56.47us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                        |  |   |  |   |  |
| Weighted average exercise price per share outstanding, ending balance (in dollars per share)                                            | $ 43.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                 |  | $ 39.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  |   |  |
| Weighted average exercise price per exercisable share (in dollars per share)                                                            | $ 37.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                 |  |   |  |   |  |
| Weighted average remaining contractual term of shares outstanding (in years)                                                            | 5 years 10 months 24 days                                                                                                                                                                                                                                                |  |   |  |   |  |
| Aggregate intrinsic value of shares outstanding                                                                                         | 97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                                    |  |   |  |   |  |
| Weighted average remaining contractual term, exercisable shares (in years)                                                              | 4 years 9 months 18 days                                                                                                                                                                                                                                                 |  |   |  |   |  |
| Aggregate intrinsic value, exercisable shares                                                                                           | 97us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                                   |  |   |  |   |  |
| **Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]**                                                         |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Minimum term to maturity on US Treasuries used to determine the risk free rate assumption in valuing stock options                      | 5 years                                                                                                                                                                                                                                                                  |  |   |  |   |  |
| Maximum term to maturity on US Treasuries used to determine the risk free rate assumption in valuing stock options                      | 7 years                                                                                                                                                                                                                                                                  |  |   |  |   |  |
| The period ended, prior to the date of grant, over which an average of daily stock prices is computed in determining the dividend yield | 3 years                                                                                                                                                                                                                                                                  |  |   |  |   |  |
| Duration of Dividends                                                                                                                   | 1 year                                                                                                                                                                                                                                                                   |  |   |  |   |  |
| Total intrinsic value of options exercised                                                                                              | 58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                         |  | 64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  | 72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember |  |
| Unrecognized compensation cost related to nonvested awards                                                                              | 39us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized/ us-gaap_AwardTypeAxis= us-gaap_StockOptionMember                                                                                                                    |  |   |  |   |  |
| The weighted-average period over which unrecognized compensation cost is to be recognized (in years)                                    | 1 year 3 months 18 days                                                                                                                                                                                                                                                  |  |   |  |   |  |
| Restricted Stock [Member]                                                                                                               |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| **Assumptions used to value stock option awards [Abstract]**                                                                            |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Expected volatility (in hundredths)                                                                                                     | 30.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember                                                                                                  |  | 30.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember |  |   |  |
| Risk-free rate (in hundredths)                                                                                                          | 0.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember                                                                                                     |  | 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember |  |   |  |
| **Restricted stock awards, shares subject to service conditions, additional disclosures [Abstract]**                                    |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Weighted average award date fair value, shares awarded (in dollars per share)                                                           | $ 41.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember                                                           |  | $ 38.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember |  | $ 50.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember |  |
| **Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]**                                                         |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| The period ended, prior to the date of grant, over which an average of daily stock prices is computed in determining the dividend yield | 3 years                                                                                                                                                                                                                                                                  |  |   |  |   |  |
| Unrecognized compensation cost related to nonvested awards                                                                              | 38us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember                                                                                                                |  |   |  |   |  |
| The weighted-average period over which unrecognized compensation cost is to be recognized (in years)                                    | 1 year 4 months 24 days                                                                                                                                                                                                                                                  |  |   |  |   |  |
| Weighted average award date fair value, shares awarded (in dollars per share)                                                           | $ 41.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember                                                           |  | $ 38.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember |  | $ 50.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember |  |
| Total fair value of vested restricted stock                                                                                             | $ 50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember                                                                                 |  | $ 43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember |  | $ 47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember |  |
| Stock Option And Restricted Stock Plan 1992 [Member]                                                                                    |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| **Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]**                                                         |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Maximum number of shares of common stock authorized for issuance After April 26, 2011 (in shares)                                       | 71,600,000nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanMaximumNumberOfSharesAuthorized/ us-gaap_PlanNameAxis= nbl_StockOptionAndRestrictedStockPlan1992Member                                                                                             |  |   |  |   |  |
| Number of shares of common stock reserved for issuance (in shares)                                                                      | 32,962,380us-gaap_CommonStockCapitalSharesReservedForFutureIssuance/ us-gaap_PlanNameAxis= nbl_StockOptionAndRestrictedStockPlan1992Member                                                                                                                               |  |   |  |   |  |
| Shares of common stock available for future grants and awards (in shares)                                                               | 14,380,862us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant/ us-gaap_PlanNameAxis= nbl_StockOptionAndRestrictedStockPlan1992Member                                                                                        |  |   |  |   |  |
| Expiration period (in years)                                                                                                            | 10 years                                                                                                                                                                                                                                                                 |  |   |  |   |  |
| Stock option vesting period                                                                                                             | 3 years                                                                                                                                                                                                                                                                  |  |   |  |   |  |
| Percentage of restricted stock awards that time-vest one year from date of grant (in hundredths)                                        | 20.00%nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanRestrictedStockAwardsVestingRightsYearOne/ us-gaap_PlanNameAxis= nbl_StockOptionAndRestrictedStockPlan1992Member                                                                                       |  |   |  |   |  |
| Additional percentage of restricted stock awards that time-vest two years from date of grant (in hundredths)                            | 30.00%nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanRestrictedStockAwardsVestingRightsYearTwo/ us-gaap_PlanNameAxis= nbl_StockOptionAndRestrictedStockPlan1992Member                                                                                       |  |   |  |   |  |
| Remaining percentage of restricted stock awards that time-vest three years from date of grant (in hundredths)                           | 50.00%nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanRestrictedStockAwardsVestingRightsAfterYearThree/ us-gaap_PlanNameAxis= nbl_StockOptionAndRestrictedStockPlan1992Member                                                                                |  |   |  |   |  |
| Stock Plan for Non-Employee Directors 2005 [Member]                                                                                     |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| **Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]**                                                         |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Maximum number of shares of common stock authorized for issuance After April 26, 2011 (in shares)                                       | 1,600,000nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanMaximumNumberOfSharesAuthorized/ us-gaap_PlanNameAxis= nbl_StockPlanForNonemployeeDirectors2005Member                                                                                               |  |   |  |   |  |
| Number of shares of common stock reserved for issuance (in shares)                                                                      | 1,359,832us-gaap_CommonStockCapitalSharesReservedForFutureIssuance/ us-gaap_PlanNameAxis= nbl_StockPlanForNonemployeeDirectors2005Member                                                                                                                                 |  |   |  |   |  |
| Shares of common stock available for future grants and awards (in shares)                                                               | 843,285us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant/ us-gaap_PlanNameAxis= nbl_StockPlanForNonemployeeDirectors2005Member                                                                                            |  |   |  |   |  |
| Expiration period (in years)                                                                                                            | 10 years                                                                                                                                                                                                                                                                 |  |   |  |   |  |
| Stock option vesting period                                                                                                             | 1 year                                                                                                                                                                                                                                                                   |  |   |  |   |  |
| The maximum number of stock options authorized for annual and discretionary grants per non-employee director (in shares)                | 22,400nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanStockOptionsAuthorizedForAnnualAndDiscretionaryGrantsPerDirector/ us-gaap_PlanNameAxis= nbl_StockPlanForNonemployeeDirectors2005Member                                                                 |  |   |  |   |  |
| The number of stock options authorized for annual grants per non-employee director (in shares)                                          | 2,800nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanStockOptionsAuthorizedForAnnualGrantPerDirector/ us-gaap_PlanNameAxis= nbl_StockPlanForNonemployeeDirectors2005Member                                                                                   |  |   |  |   |  |
| The maximum number of shares of restricted stock authorized for annual and discretionary grants per non-employee director (in shares)   | 9,600nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanRestrictedStockAwardsAuthorizedForAnnualAndDiscretionaryGrantsPerDirector/ us-gaap_PlanNameAxis= nbl_StockPlanForNonemployeeDirectors2005Member                                                         |  |   |  |   |  |
| The number of shares of restricted stock authorized for annual grants per non-employee director (in shares)                             | 1,200nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanRestrictedStockAwardsAuthorizedForAnnualGrantPerDirector/ us-gaap_PlanNameAxis= nbl_StockPlanForNonemployeeDirectors2005Member                                                                          |  |   |  |   |  |
| Stock Plan For Nonemployee Directors 2005, Prior to March 17, 2011 [Member]                                                             |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| **Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]**                                                         |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| The maximum number of stock options authorized for annual and discretionary grants per non-employee director (in shares)                | 11,200nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanStockOptionsAuthorizedForAnnualAndDiscretionaryGrantsPerDirector/ us-gaap_PlanNameAxis= nbl_StockPlanForNonemployeeDirectors2005PriortoMarch172011Member                                               |  |   |  |   |  |
| The maximum number of shares of restricted stock authorized for annual and discretionary grants per non-employee director (in shares)   | 4,800nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanRestrictedStockAwardsAuthorizedForAnnualAndDiscretionaryGrantsPerDirector/ us-gaap_PlanNameAxis= nbl_StockPlanForNonemployeeDirectors2005PriortoMarch172011Member                                       |  |   |  |   |  |
| Nonqualified Stock Option Plan for Non-Employee Directors 1988 [Member]                                                                 |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| **Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]**                                                         |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Shares of common stock available for future grants and awards (in shares)                                                               | 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant/ us-gaap_PlanNameAxis= nbl_NonqualifiedStockOptionPlanForNonemployeeDirectors1988Member                                                                                |  |   |  |   |  |
| Expiration period (in years)                                                                                                            | 10 years                                                                                                                                                                                                                                                                 |  |   |  |   |  |
| Stock option vesting period                                                                                                             | 1 year                                                                                                                                                                                                                                                                   |  |   |  |   |  |
| The number of stock options authorized for annual grants per non-employee director (in shares)                                          | 10,000nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanStockOptionsAuthorizedForAnnualGrantPerDirector/ us-gaap_PlanNameAxis= nbl_NonqualifiedStockOptionPlanForNonemployeeDirectors1988Member                                                                |  |   |  |   |  |
| The number of stock options granted during the first calendar year of service (in shares)                                               | 20,000nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanOptionsAuthorizedForGrantFirstYearOfServicePerDirector/ us-gaap_PlanNameAxis= nbl_NonqualifiedStockOptionPlanForNonemployeeDirectors1988Member                                                         |  |   |  |   |  |
| Subject to Time Vesting [Member] | Restricted Stock [Member]                                                                            |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| **Restricted Stock Awards Activity [Roll Forward]**                                                                                     |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Outstanding, beginning balance (in shares)                                                                                              | 1,487,869us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoTimeVestingMember                                    |  |   |  |   |  |
| Awarded (in shares)                                                                                                                     | 441,647us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoTimeVestingMember                                       |  |   |  |   |  |
| Vested (in shares)                                                                                                                      | (796,877)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoTimeVestingMember                                     |  |   |  |   |  |
| Forfeited (in shares)                                                                                                                   | (83,839)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoTimeVestingMember                                   |  |   |  |   |  |
| Outstanding, ending balance (in shares)                                                                                                 | 1,048,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoTimeVestingMember                                    |  |   |  |   |  |
| **Restricted stock awards, shares subject to service conditions, additional disclosures [Abstract]**                                    |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Weighted average award date fair value, beginning of period (in dollars per share)                                                      | $ 50.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoTimeVestingMember           |  |   |  |   |  |
| Weighted average award date fair value, shares awarded (in dollars per share)                                                           | $ 62.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoTimeVestingMember      |  |   |  |   |  |
| Weighted average award date fair value, shares vested (in dollars per share)                                                            | $ 49.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoTimeVestingMember      |  |   |  |   |  |
| Weighted average award date fair value, shares forfeited (in dollars per share)                                                         | $ 55.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoTimeVestingMember         |  |   |  |   |  |
| Weighted average award date fair value, end of period (in dollars per share)                                                            | $ 55.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoTimeVestingMember           |  |   |  |   |  |
| **Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]**                                                         |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Weighted average award date fair value, shares awarded (in dollars per share)                                                           | $ 62.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoTimeVestingMember      |  |   |  |   |  |
| Subject to Market Conditions [Member] | Restricted Stock [Member]                                                                       |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| **Restricted Stock Awards Activity [Roll Forward]**                                                                                     |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Outstanding, beginning balance (in shares)                                                                                              | 848,026us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoMarketConditionsMember                                 |  |   |  |   |  |
| Awarded (in shares)                                                                                                                     | 797,792us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoMarketConditionsMember                                  |  |   |  |   |  |
| Vested (in shares)                                                                                                                      | 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoMarketConditionsMember                                        |  |   |  |   |  |
| Forfeited (in shares)                                                                                                                   | (127,482)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoMarketConditionsMember                             |  |   |  |   |  |
| Outstanding, ending balance (in shares)                                                                                                 | 1,518,336us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoMarketConditionsMember                               |  |   |  |   |  |
| **Restricted stock awards, shares subject to service conditions, additional disclosures [Abstract]**                                    |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Weighted average award date fair value, beginning of period (in dollars per share)                                                      | $ 28.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoMarketConditionsMember      |  |   |  |   |  |
| Weighted average award date fair value, shares awarded (in dollars per share)                                                           | $ 29.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoMarketConditionsMember |  |   |  |   |  |
| Weighted average award date fair value, shares vested (in dollars per share)                                                            | $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoMarketConditionsMember  |  |   |  |   |  |
| Weighted average award date fair value, shares forfeited (in dollars per share)                                                         | $ 29.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoMarketConditionsMember    |  |   |  |   |  |
| Weighted average award date fair value, end of period (in dollars per share)                                                            | $ 29.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoMarketConditionsMember      |  |   |  |   |  |
| **Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]**                                                         |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Weighted average award date fair value, shares awarded (in dollars per share)                                                           | $ 29.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue/ us-gaap_AwardTypeAxis= us-gaap_RestrictedStockMember/ us-gaap_VestingAxis= nbl_SubjecttoMarketConditionsMember |  |   |  |   |  |
| Second Vesting Option [Member] | Stock Option And Restricted Stock Plan 1992 [Member]                                                   |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| **Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]**                                                         |                                                                                                                                                                                                                                                                     |  |   |  |   |  |
| Stock option vesting period                                                                                                             | 2 years                                                                                                                                                                                                                                                                  |  |   |  |   |  |
| Percentage of restricted stock awards that time-vest one year from date of grant (in hundredths)                                        | 40.00%nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanRestrictedStockAwardsVestingRightsYearOne/ us-gaap_PlanNameAxis= nbl_StockOptionAndRestrictedStockPlan1992Member/ us-gaap_VestingAxis= nbl_SecondVestingOptionMember                                   |  |   |  |   |  |
| Additional percentage of restricted stock awards that time-vest two years from date of grant (in hundredths)                            | 60.00%nbl_ShareBasedCompensationArrangementByShareBasedPaymentPlanRestrictedStockAwardsVestingRightsYearTwo/ us-gaap_PlanNameAxis= nbl_StockOptionAndRestrictedStockPlan1992Member/ us-gaap_VestingAxis= nbl_SecondVestingOptionMember                                   |  |   |  |   |  |
|                                                                                                                                         |
| [1]Amounts represent increases (decreases) in the fair value of shares of our common stock held in a rabbi trust.                       |

| X                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Duration of time for our expected dividends to be used in the calculation of our dividend yield.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the dating as to when the share-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, in years, month and year).
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The period of time during which a range of company stock prices is used to calculate an average stock price.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum term to maturity on US Treasuries used within the option valuation model to approximate a risk-free rate assumption. The risk-free rate is the implied yield on US Treasury securities with remaining term equal to the expected term of the option.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum term to maturity on US Treasuries used within the option valuation model to approximate a risk free rate assumption. The risk-free rate is the implied yield on US Treasury securities with remaining term equal to the expected term of the option.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum range number of shares approved, net of any subsequent amendments and adjustments, for awards under share-based compensation plans.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of option shares available for granting to a non-employee director during the first calendar year of service.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum number of restricted stock units approved (usually by shareholders and board of directors) for annual and discretionary awards.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of restricted stock units that are awarded annually to a non-employee director
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of restricted stock award terms as to the percentage of shares which are no longer contingent, three years after date of grant, on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert a percentage of the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of restricted stock award terms as to the percentage of shares which are no longer contingent, one year after date of grant, on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert a percentage of the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of restricted stock award terms as to the percentage of shares which are no longer contingent, two years after date of grant, on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert a percentage of the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum number of option shares approved (usually by shareholders and board of directors) for annual and discretionary grants to a non-employee director.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of option shares available for annual grants, per non-employee director, to be awarded on February 1 of each year.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate number of common shares reserved for future issuance.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The compensation expense recognized during the period pertaining to the deferred compensation arrangement.
+ References
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| X                                                                                                                                                                                                     |
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Unrecognized cost of unvested share-based compensation awards.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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| X                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.
+ References
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| - Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.
+ References
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| - Definition
Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.
+ References
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| - Definition
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.
+ References
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| - Definition
The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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| - Definition
Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.
+ References
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| - Definition
For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.
+ References
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| - Definition
Net number of share options (or share units) granted during the period.
+ References
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| - Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.
+ References
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| - Definition
Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of options outstanding, including both vested and non-vested options.
+ References
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| - Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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| - Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares.
+ References
No definition available.
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| - Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.
+ References
No definition available.
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| - Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.
+ References
No definition available.
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| - Definition
Number of share options (or share units) exercised during the current period.
+ References
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