| **Debt - Summary of Debt (Details) - USD ($) $ in Millions**                                      | Mar. 31, 2019 | Dec. 31, 2018 |
|---------------------------------------------------------------------------------------------------|---------------|---------------|
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Finance Lease Obligations                                                                         | $ 215         | $ 223         |
| Finance Lease Obligations, Interest Rate                                                          | 0.00%         | 0.00%         |
| Total                                                                                             | $ 6,837       | $ 6,675       |
| Net Unamortized Discounts and Debt Issuance Costs                                                 | (58)          | (60)          |
| Total Debt                                                                                        | 6,779         | 6,615         |
| Finance Lease Obligations                                                                         | (41)          | (41)          |
| Long-Term Debt Due After One Year                                                                 | 6,738         | 6,574         |
| Revolving Credit Facility, due March 9 2023                                                       |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 0           | $ 0           |
| Interest Rate                                                                                     | 0.00%         | 0.00%         |
| Maximum borrowing capacity                                                                        | $ 4,000       |          |
| Noble Midstream Services Revolving Credit Facility                                                |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Maximum borrowing capacity                                                                        | 800           |          |
| Available borrowing capacity                                                                      | 570           | $ 740         |
| Revolving Credit Facility | Noble Midstream Services Revolving Credit Facility Due March 9, 2023  |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 230         | $ 60          |
| Interest Rate                                                                                     | 3.66%         | 3.67%         |
| Revolving Credit Facility | Noble Midstream Services Term Loan Credit Facility, due July 31, 2021 |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 500         | $ 500         |
| Interest Rate                                                                                     | 3.41%         | 3.42%         |
| Senior Notes and Debentures                                                                       |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 5,892       | $ 5,892       |
| Weighted average interest rate                                                                    | 5.01%         | 5.01%         |

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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
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
Amount of unamortized debt discount (premium) and debt issuance costs.
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Weighted average interest rate of debt outstanding.
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| - Definition
Present value of lessee's discounted obligation for lease payments from finance lease.
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| - Definition
Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.
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| - Definition
Weighted average discount rate for finance lease calculated at point in time.
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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
Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.
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Amount of long-term debt and capital lease obligations including current maturities.
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