| **Long-Term Debt - Narrative (Details) - USD ($)**                             |               |                 | 1 Months Ended | 3 Months Ended | 12 Months Ended |                   |                 |
|--------------------------------------------------------------------------------|---------------|-----------------|----------------|----------------|-----------------|-------------------|-----------------|
||
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Debt                                                                           |          |            |           |           |            | $ 6,675,000,000   | $ 6,859,000,000 |   |   |   |
| Repayments of senior debt                                                      |          |            |           |           |            | 384,000,000       | 1,114,000,000   | $ 1,383,000,000 |   |   |
| Unamortized discount                                                           |          |            |           |           |            | 22,000,000        | 24,000,000      |   |   |   |
| Proceeds from issuance of senior notes                                         |          |            |           |           |            | 0                 | 1,086,000,000   | $ 0 |   |   |
| Unamortized Premium                                                            |          |            |           |           |            | 0                 | 12,000,000      |   |   |   |
| Senior Notes                                                                   |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Unamortized discount                                                           |          | $ 4,000,000     |           |           |            |              |            |   |   |   |
| Debt issuance costs, gross                                                     |          | 11,000,000      |           |           |            |              |            |   |   |   |
| Proceeds from issuance of senior notes                                         |          | 1,100,000,000   |           |           |            |              |            |   |   |   |
| Loss on debt                                                                   |          |            |           |           | $ 98,000,000    |              |            |   |   |   |
| Noble Midstream | Revolving Credit Facility                                    |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Maximum borrowing capacity                                                     |          |            |           |           |            | $ 500,000,000     |            |   |   |   |
| Noble Midstream | Line of Credit                                               |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Maximum borrowing capacity                                                     |          |            |           |           |            |              | 350,000,000     |   | $ 800,000,000 |   |
| Noble Midstream | Line of Credit | Federal Funds Effective Swap Rate           |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Basis spread                                                                   |          |            |           |           |            | 0.50%             |            |   |   |   |
| Noble Midstream | Line of Credit | London Interbank Offered Rate (LIBOR)       |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Basis spread                                                                   |          |            |           |           |            | 1.00%             |            |   |   |   |
| Line of Credit | Noble Midstream                                               |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Maximum borrowing capacity                                                     | $ 500,000,000 |            |           |           |            |              |            |   |   |   |
| Credit facility, term                                                          |          |            |           |           |            | 3 years           |            |   |   |   |
| Minimum | Line of Credit | Noble Midstream | Base Rate                         |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Basis spread                                                                   | 0.00%         |            |           |           |            |              |            |   |   |   |
| Minimum | Line of Credit | Noble Midstream | Eurodollar                        |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Basis spread                                                                   | 1.00%         |            |           |           |            |              |            |   |   |   |
| Maximum | Line of Credit | Noble Midstream | Base Rate                         |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Basis spread                                                                   | 0.50%         |            |           |           |            |              |            |   |   |   |
| Maximum | Line of Credit | Noble Midstream | Eurodollar                        |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Basis spread                                                                   | 1.50%         |            |           |           |            |              |            |   |   |   |
| Revolving Credit Facility, due March 9, 2023                                   |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Maximum borrowing capacity                                                     |          |            |           |           |            | $ 4,000,000,000.0 |            |   |   |   |
| Credit facility fee rate basis points, minimum                                 |          |            |           |           |            | 0.10%             |            |   |   |   |
| Credit facility fee rate basis points, maximum                                 |          |            |           |           |            | 0.25%             |            |   |   |   |
| Credit facility interest rate, Eurodollar rate plus, minimum                   |          |            |           |           |            | 0.90%             |            |   |   |   |
| Credit facility interest rate, Eurodollar rate plus, maximum                   |          |            |           |           |            | 1.50%             |            |   |   |   |
| Credit facility covenant term debt to capitalization ratio maximum             |          |            |           |           |            | 65.00%            |            |   |   |   |
| Debt                                                                           |          |            |           |           |            | $ 0               | $ 230,000,000   |   |   |   |
| Interest Rate                                                                  |          |            |           |           |            | 0.00%             | 2.27%           |   |   |   |
| Noble Midstream Services Revolving Credit Facility | Revolving Credit Facility |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Repayments of term loan facility                                               |          |            |           | $ 480,000,000  |            |              |            |   |   |   |
| Debt                                                                           |          |            |           |           |            | $ 60,000,000      |            |   |   |   |
| Noble Midstream Services Term Loan Credit Facility | Revolving Credit Facility |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Debt                                                                           |          |            |           |           |            | $ 500,000,000     | $ 0             |   |   |   |
| Interest Rate                                                                  |          |            |           |           |            | 3.42%             | 0.00%           |   |   |   |
| Senior Notes, due May 1, 2021                                                  |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Debt                                                                           |          |            |           |           |            | $ 0               | $ 379,000,000   |   |   |   |
| Repayments of senior debt                                                      |          |            | $ 395,000,000  |           |            |              |            |   |   |   |
| Interest Rate                                                                  |          |            |           |           |            | 0.00%             | 5.63%           |   |   |   |
| Senior Notes, due May 1, 2021 | Senior Notes                                   |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Extinguishment of Debt, Amount                                                 |          |            | $ 379,000,000  |           |            |              |            |   |   |   |
| Senior Notes, due January 15, 2028                                             |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Debt                                                                           |          |            |           |           |            | $ 600,000,000     | $ 600,000,000   |   |   |   |
| Interest Rate                                                                  |          |            |           |           |            | 3.85%             | 3.85%           |   |   |   |
| Senior Notes, due January 15, 2028 | Senior Notes                              |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Face amount                                                                    |          | $ 600,000,000   |           |           |            |              |            |   |   |   |
| Interest Rate                                                                  |          | 3.85%           |           |           |            |              |            |   |   |   |
| Senior Notes, due August 15, 2047                                              |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Debt                                                                           |          |            |           |           |            | $ 500,000,000     | $ 500,000,000   |   |   |   |
| Interest Rate                                                                  |          |            |           |           |            | 4.95%             | 4.95%           |   |   |   |
| Senior Notes, due August 15, 2047 | Senior Notes                               |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Face amount                                                                    |          | $ 500,000,000   |           |           |            |              |            |   |   |   |
| Interest Rate                                                                  |          | 4.95%           |           |           |            |              |            |   |   |   |
| Senior Notes, due March 1, 2019 | Senior Notes                                 |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Interest Rate                                                                  |          |            |           | 8.25%          |            |              |            |   |   |   |
| Debt redemption amount                                                         |          | $ 1,100,000,000 |           |           |            |              |            |   |   |   |
| Unamortized Premium                                                            |          | $ 96,000,000    |           |           |            |              |            |   |   |   |
| Leviathan Term Loan Facility, due February 23, 2025 | Line of Credit           |          |            |           |           |            |              |            |   |   |   |
| **Debt Instrument [Line Items]**                                               |          |            |           |           |            |              |            |   |   |   |
| Maximum borrowing capacity                                                     |          |            |           |           |            |              |            |   |   | $ 1,000,000,000.0 |
| Long-term line of credit                                                       |          |            |           |           |            |              |            |   |   | $ 625,000,000 |

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For a Credit facility debt covenant requirement, maximum debt to capitalization ratio for compliance.
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Amount of the fee for available but unused credit capacity under the credit facility, maximum
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Amount of the fee for available but unused credit capacity under the credit facility, minimum
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Adjustment maximum made to the stated Eurodollar rate to determine the effective rate.
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Adjustment minimum made to the stated Eurodollar rate to determine the effective rate.
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Percentage points added to the reference rate to compute the variable rate on the debt instrument.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.
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| - Definition
Face (par) amount of debt instrument at time of issuance.
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| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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| - Definition
Fair value amount of debt instrument that was repurchased.
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| - Definition
Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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| - Definition
Amount, after accumulated amortization, of debt discount.
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| - Definition
Amount, after accumulated amortization, of debt premium.
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| - Definition
Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.
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Gross amount of debt extinguished.
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Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.
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| - Definition
The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.
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| - Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.
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| - Definition
The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).
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| - Definition
Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585
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