| **Income Taxes (Details) - USD ($) $ in Millions**                                                                             | 1 Months Ended | 12 Months Ended |        |
|--------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|--------|
||
| **Components of income (loss) before income taxes [Abstract]**                                                                 |           |            |   |   |   |   |   |
| Domestic                                                                                                                       |           |            |   | $ (1,859) | $ (2,338) | $ 282 |   |
| Foreign                                                                                                                        |           |            |   | 87 | 119 | 1,428 |   |
| (Loss) Income Before Income Taxes                                                                                              |           |            |   | (1,772) | (2,219) | 1,710 |   |
| **Current Taxes**                                                                                                              |           |            |   |   |   |   |   |
| Federal                                                                                                                        |           |            |   | (4) | (1) | 19 |   |
| State                                                                                                                          |           |            |   | 5 | 0 | 1 |   |
| Foreign                                                                                                                        |           |            |   | 196 | 107 | 208 |   |
| Total Current                                                                                                                  |           |            |   | 197 | 106 | 228 |   |
| **Deferred Taxes**                                                                                                             |           |            |   |   |   |   |   |
| Federal                                                                                                                        |           |            |   | (784) | 216 | 237 |   |
| State                                                                                                                          |           |            |   | (24) | (5) | 13 |   |
| Foreign                                                                                                                        |           |            |   | (176) | (95) | 18 |   |
| Total Deferred                                                                                                                 |           |            |   | (984) | 116 | 268 |   |
| Total Income Tax Provision (Benefit) Including Noncontrolling Interests                                                        |           |            |   | (787) | 222 | 496 |   |
| Total Income Tax Provision (Benefit) Attributable to Noble Energy                                                              |           |            |   | $ (787) | $ 222 | $ 496 |   |
| Effective Tax Rate (in hundredths)                                                                                             |           |            |   | 44.40% | (10.00%) | 29.00% |   |
| **Federal statutory tax rate reconciliation [Abstract]**                                                                       |           |            |   |   |   |   |   |
| Federal Statutory Rate (in hundredths)                                                                                         |           |            |   | 35.00% | 35.00% | 35.00% |   |
| **Effect of**                                                                                                                  |           |            |   |   |   |   |   |
| Earnings of Equity Method Investees (in hundredths)                                                                            |           |            |   | 1.00% | 0.60% | (3.30%) |   |
| Noncontrolling Interests                                                                                                       |           |            |   | 0.40% | (0.00%) | (0.00%) |   |
| Foreign Rate Change                                                                                                            |           |            |   | 1.60% | 0.00% | 0.00% |   |
| State Taxes, Net of Federal Benefit (in hundredths)                                                                            |           |            |   | 1.30% | 0.30% | 0.80% |   |
| Difference Between US and Foreign Rates (in hundredths)                                                                        |           |            |   | (0.10%) | 2.60% | (14.20%) |   |
| Foreign Exploration Loss (in hundredths)                                                                                       |           |            |   | 0.10% | 2.70% | 0.00% |   |
| Change in Valuation Allowance (in hundredths)                                                                                  |           |            |   | (2.00%) | 0.00% | 1.90% |   |
| Oil Profits Tax - Israel (in hundredths)                                                                                       |           |            |   | 0.00% | 0.10% | 0.20% |   |
| Tax Contingency (in hundredths)                                                                                                |           |            |   | 0.20% | 0.40% | 0.10% |   |
| Indefinite Reinvestment of Foreign Earnings (in hundredths)                                                                    |           |            |   | 7.20% | (37.70%) | 8.20% |   |
| Goodwill Impairment                                                                                                            |           |            |   | 0.00% | (12.30%) | 0.00% |   |
| Other, Net (in hundredths)                                                                                                     |           |            |   | (0.30%) | (1.70%) | 0.30% |   |
| Effective Tax Rate (in hundredths)                                                                                             |           |            |   | 44.40% | (10.00%) | 29.00% |   |
| **Deferred Tax Assets**                                                                                                        |           |            |   |   |   |   |   |
| Loss Carryforwards                                                                                                             |           |            |   | $ 474 | $ 468 |   |   |
| Employee Compensation and Benefits                                                                                             |           |            |   | 150 | 151 |   |   |
| Other                                                                                                                          |           |            |   | 49 | 81 |   |   |
| Total Deferred Tax Assets                                                                                                      |           |            |   | 673 | 700 |   |   |
| Net Deferred Tax Assets                                                                                                        |           |            |   | 431 | 494 |   |   |
| Deferred Tax Assets, Derivative Instruments                                                                                    |           |            |   | 44 |   |   |   |
| **Deferred Tax Liabilities**                                                                                                   |           |            |   |   |   |   |   |
| Mark to Market of Commodity Derivative Instruments                                                                             |           |            |   |   | (128) |   |   |
| Accumulated Undistributed Foreign Earnings                                                                                     |           |            |   | 240 | 368 |   |   |
| Property, Plant and Equipment, Principally Due to Differences in Depreciation, Amortization, Lease Impairment and Abandonments |           |            |   | (2,054) | (2,824) |   |   |
| Deferred Tax Liabilities, Gross                                                                                                |           |            |   | 2,250 | 3,320 |   |   |
| Total Deferred Tax Liability                                                                                                   |           |            |   | (1,819) | (2,826) |   |   |
| **Deferred Tax Asset and Liability Classification [Abstract]**                                                                 |           |            |   |   |   |   |   |
| Deferred Tax Liabilities, Net, Current                                                                                         |           |            |   | 0 | 0 |   |   |
| Deferred Income Tax Liability - Noncurrent                                                                                     |           |            |   | (1,819) | (2,826) |   |   |
| **Accumulated Undistributed Earnings of Foreign Subsidiaries [Abstract]**                                                      |           |            |   |   |   |   |   |
| Accumulated undistributed earnings of foreign subsidiaries                                                                     |           |            |   | 1,600 |   |   |   |
| Estimated future US taxes on the eventual remittance of accumulated undistributed foreign subsidiary earnings                  |           |            |   | $ 128 |   |   |   |
| US [Member]                                                                                                                    |           |            |   |   |   |   |   |
| **Earliest Year Open to Examination [Abstract]**                                                                               |           |            |   |   |   |   |   |
| Income Tax Examination, Year under Examination                                                                                 |           |            |   | 2013 |   |   |   |
| Equatorial Guinea [Member]                                                                                                     |           |            |   |   |   |   |   |
| **Earliest Year Open to Examination [Abstract]**                                                                               |           |            |   |   |   |   |   |
| Income Tax Examination, Year under Examination                                                                                 |           |            |   | 2011 |   |   |   |
| Israel [Member]                                                                                                                |           |            |   |   |   |   |   |
| **Effect of**                                                                                                                  |           |            |   |   |   |   |   |
| Statutory Federal Corporate Tax Rate Future Year                                                                               |           | 25.00%          | 26.50% |   |   |   |   |
| Change in taxes due to change in rate                                                                                          |           |            |   | $ 30 |   |   |   |
| **Earliest Year Open to Examination [Abstract]**                                                                               |           |            |   |   |   |   |   |
| Income Tax Examination, Year under Examination                                                                                 |           |            |   | 2015 |   |   |   |
| Foreign Loss Carryforward [Member]                                                                                             |           |            |   |   |   |   |   |
| **Deferred Tax Assets**                                                                                                        |           |            |   |   |   |   |   |
| Deferred Tax Assets, Valuation Allowance                                                                                       |           |            |   | $ (242) | (206) |   |   |
| **Deferred Tax Liabilities**                                                                                                   |           |            |   |   |   |   |   |
| Valuation Allowance Deferred Tax Asset Reversal                                                                                |           |            |   |   | $ 60 |   |   |
| Rosetta Resources, Inc                                                                                                         |           |            |   |   |   |   |   |
| **Deferred Tax Liabilities**                                                                                                   |           |            |   |   |   |   |   |
| Operating Loss Carryforwards                                                                                                   |           |            |   |   |   |   | $ 681 |
| Subsequent Event | Israel [Member]                                                                                             |           |            |   |   |   |   |   |
| **Effect of**                                                                                                                  |           |            |   |   |   |   |   |
| Statutory Federal Corporate Tax Rate Future Year                                                                               | 24.00%         |            |   |   |   |   |   |

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Supplementary charge levied on oil and gas profits in foreign country.
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Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.
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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.
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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits.
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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.
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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.
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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as current.
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Amount of deferred tax liability attributable to taxable temporary differences from derivatives.
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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent.
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Amount of deferred tax liability attributable to taxable temporary differences classified as other.
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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.
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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).
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| - Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions.
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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity in earnings (loss) of unconsolidated subsidiaries exempt from income taxes.
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| - Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.
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| - Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.
+ References
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| - Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.
+ References
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| - Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the repatriation of foreign earnings.
+ References
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| - Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.
+ References
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| - Definition
The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.
+ References
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| - Definition
The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.
+ References
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| - References
No definition available.
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| - Definition
Tax year being audited in the income tax examination, in CCYY format.
+ References
No definition available.
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.
+ References
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| - Definition
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.
+ References
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