| **Debt - Narrative (Details) - USD ($)**                                                                                      |               | 1 Months Ended | 3 Months Ended  | 9 Months Ended |                 |                 |
|-------------------------------------------------------------------------------------------------------------------------------|---------------|----------------|-----------------|----------------|-----------------|-----------------|
||
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Repayment of Senior Notes                                                                                                     |          |           |            |           | $ 384,000,000   | $ 1,096,000,000 |   |   |
| Unamortized Premium                                                                                                           |          |           | $ 0             |           | 0               |            | $ 12,000,000 |   |
| (Gain) Loss on Extinguishment of Debt                                                                                         |          |           | 0               | $ (98,000,000) | 3,000,000       | $ (98,000,000)  |   |   |
| Revolving Credit Facility, due March 9, 2023                                                                                  |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Maximum borrowing capacity                                                                                                    |          |           | 4,000,000,000.0 |           | 4,000,000,000.0 |            |   |   |
| Debt                                                                                                                          |          |           | 0               |           | 0               |            | 230,000,000 |   |
| Leviathan Term Loan Facility, due February 23, 2025                                                                           |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Debt                                                                                                                          |          |           | 0               |           | 0               |            | 0 |   |
| Senior Notes, due May 1, 2021                                                                                                 |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Debt                                                                                                                          |          |           | 0               |           | 0               |            | 379,000,000 |   |
| Repayment of Senior Notes                                                                                                     |          | $ 395,000,000  |            |           |            |            |   |   |
| Senior Notes | Senior Notes, due May 1, 2021                                                                                  |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Early call of debt                                                                                                            |          | 379,000,000    |            |           |            |            |   |   |
| Unamortized Premium                                                                                                           |          | 10,000,000     |            |           |            |            |   |   |
| Interest accrued                                                                                                              |          | 11,000,000     |            |           |            |            |   |   |
| Call premium                                                                                                                  |          | 5,000,000      |            |           |            |            |   |   |
| (Gain) Loss on Extinguishment of Debt                                                                                         |          | $ 5,000,000    |            |           |            |            |   |   |
| Revolving Credit Facility | Noble Midstream Services Revolving Credit Facility Due March 9, 2023                              |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Repayments of lines of credit                                                                                                 |          |           | 480,000,000     |           |            |            |   |   |
| Debt                                                                                                                          |          |           | 50,000,000      |           | 50,000,000      |            | 85,000,000 |   |
| Line of Credit                                                                                                                |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Debt maturity, 2021                                                                                                           |          |           | 1,000,000,000.0 |           | 1,000,000,000.0 |            |   |   |
| Noble Midstream | Revolving Credit Facility                                                                                   |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Maximum borrowing capacity                                                                                                    |          |           | 500,000,000     |           | 500,000,000     |            |   |   |
| Noble Midstream | Line of Credit                                                                                              |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Maximum borrowing capacity                                                                                                    |          |           | $ 800,000,000   |           | $ 800,000,000   |            | $ 350,000,000 |   |
| Noble Midstream | Line of Credit | Federal Funds Effective Swap Rate                                                          |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               |          |           |            |           | 0.50%           |            |   |   |
| Noble Midstream | Line of Credit | London Interbank Offered Rate (LIBOR)                                                      |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               |          |           |            |           | 1.00%           |            |   |   |
| Line of Credit | Leviathan Term Loan Facility, due February 23, 2025                                                          |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Maximum borrowing capacity                                                                                                    |          |           |            |           |            |            |   | $ 1,000,000,000.0 |
| Credit facility draw                                                                                                          |          |           |            |           |            |            |   | $ 625,000,000 |
| Maximum final balloon payment allowable                                                                                       |          |           |            |           | 35.00%          |            |   |   |
| Commitment fee                                                                                                                |          |           |            |           | 1.00%           |            |   |   |
| Line of Credit | Leviathan Term Loan Facility, due February 23, 2025 | LIBOR Prior to Production Startup                      |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               |          |           |            |           | 3.50%           |            |   |   |
| Line of Credit | Leviathan Term Loan Facility, due February 23, 2025 | LIBOR After Startup Prior to Two Years Before Maturity |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               |          |           |            |           | 3.25%           |            |   |   |
| Line of Credit | Leviathan Term Loan Facility, due February 23, 2025 | LIBOR Last Two Years Until Maturity                    |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               |          |           |            |           | 3.75%           |            |   |   |
| Line of Credit | Noble Midstream                                                                                              |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Maximum borrowing capacity                                                                                                    | $ 500,000,000 |           |            |           |            |            |   |   |
| Minimum | Revolving Credit Facility, due March 9, 2023                                                                        |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               |          |           |            |           | 0.10%           |            |   |   |
| Minimum | Revolving Credit Facility, due March 9, 2023 | Eurodollar                                                           |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               |          |           |            |           | 0.90%           |            |   |   |
| Minimum | Line of Credit | Noble Midstream | Eurodollar                                                                       |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               | 1.00%         |           |            |           |            |            |   |   |
| Minimum | Line of Credit | Noble Midstream | Base Rate                                                                        |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               | 0.00%         |           |            |           |            |            |   |   |
| Maximum | Revolving Credit Facility, due March 9, 2023                                                                        |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               |          |           |            |           | 0.25%           |            |   |   |
| Maximum | Revolving Credit Facility, due March 9, 2023 | Eurodollar                                                           |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               |          |           |            |           | 1.50%           |            |   |   |
| Maximum | Line of Credit | Noble Midstream | Eurodollar                                                                       |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               | 1.50%         |           |            |           |            |            |   |   |
| Maximum | Line of Credit | Noble Midstream | Base Rate                                                                        |          |           |            |           |            |            |   |   |
| **Debt Instrument [Line Items]**                                                                                              |          |           |            |           |            |            |   |   |
| Facility fee and interest rates                                                                                               | 0.50%         |           |            |           |            |            |   |   |

| X                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Debt Instrument, Call Premium
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Debt Instrument, Interest Accrued
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line of Credit Facility, Maximum Final Balloon Payment Allowable as of Loans Outstanding
+ References
No definition available.
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| - Definition
Percentage points added to the reference rate to compute the variable rate on the debt instrument.
+ References
No definition available.
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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.
+ References
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| - Definition
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.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after accumulated amortization, of debt premium.
+ References
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| X                                                                                                                                                                                                                                                         |
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| - Definition
Gross amount of debt extinguished.
+ References
No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.
+ References
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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.
+ References
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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.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
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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
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