| **Long-Term Debt - Summary of Debt (Details) - USD ($) $ in Millions**                            | Dec. 31, 2018 | Dec. 31, 2017 |
|---------------------------------------------------------------------------------------------------|---------------|---------------|
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 6,675       | $ 6,859       |
| Unamortized Discount                                                                              | (22)          | (24)          |
| Unamortized Premium                                                                               | 0             | 12            |
| Unamortized Debt Issuance Costs                                                                   | (38)          | (40)          |
| Total Debt, Net of Unamortized Discount, Premium and Debt Issuance Costs                          | 6,615         | 6,807         |
| Capital Lease Obligations, Current                                                                | (41)          | (61)          |
| Long-Term Debt Due After One Year                                                                 | 6,574         | 6,746         |
| Revolving Credit Facility, due March 9, 2023                                                      |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 0           | $ 230         |
| Interest Rate                                                                                     | 0.00%         | 2.27%         |
| Senior Notes, due May 1, 2021                                                                     |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 0           | $ 379         |
| Interest Rate                                                                                     | 0.00%         | 5.63%         |
| Senior Notes, due December 15, 2021                                                               |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 1,000       | $ 1,000       |
| Interest Rate                                                                                     | 4.15%         | 4.15%         |
| Senior Notes, due October 15, 2023                                                                |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 100         | $ 100         |
| Interest Rate                                                                                     | 7.25%         | 7.25%         |
| Senior Notes, due November 15, 2024                                                               |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 650         | $ 650         |
| Interest Rate                                                                                     | 3.90%         | 3.90%         |
| Senior Notes, due April 1, 2027                                                                   |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 250         | $ 250         |
| Interest Rate                                                                                     | 8.00%         | 8.00%         |
| Senior Notes, due January 15, 2028                                                                |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 600         | $ 600         |
| Interest Rate                                                                                     | 3.85%         | 3.85%         |
| Senior Notes, due March 1, 2041                                                                   |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 850         | $ 850         |
| Interest Rate                                                                                     | 6.00%         | 6.00%         |
| Senior Notes, due November 15, 2043                                                               |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 1,000       | $ 1,000       |
| Interest Rate                                                                                     | 5.25%         | 5.25%         |
| Senior Notes, due November 15, 2044                                                               |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 850         | $ 850         |
| Interest Rate                                                                                     | 5.05%         | 5.05%         |
| Senior Notes, due August 15, 2047                                                                 |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 500         | $ 500         |
| Interest Rate                                                                                     | 4.95%         | 4.95%         |
| Other Senior Notes and Debentures                                                                 |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 92          | $ 92          |
| Interest Rate                                                                                     | 7.13%         | 7.13%         |
| Capital Lease Obligations                                                                         |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Capital Lease Obligations                                                                         | $ 223         | $ 273         |
| Interest Rate                                                                                     | 0.00%         | 0.00%         |
| Senior Notes, due June 1, 2024                                                                    |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 8           |          |
| Senior Debentures due August 1, 2097                                                              |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 84          |          |
| Revolving Credit Facility | Noble Midstream Services Revolving Credit Facility, due March 9, 2023 |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              |          | $ 85          |
| Interest Rate                                                                                     | 3.67%         | 2.75%         |
| Revolving Credit Facility | Noble Midstream Services Term Loan Credit Facility                    |          |          |
| **Debt Instrument [Line Items]**                                                                  |          |          |
| Debt                                                                                              | $ 500         | $ 0           |
| Interest Rate                                                                                     | 3.42%         | 0.00%         |

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| - Definition
Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.
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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.
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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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| - 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, 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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| - Definition
The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.
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