| **Long-Term Debt - Summary (Details) - USD ($) $ in Millions**                       | 3 Months Ended | 12 Months Ended |          |
|--------------------------------------------------------------------------------------|----------------|-----------------|----------|
||
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 6,859        | $ 6,859         | $ 7,114  |   |   |
| Unamortized Discount                                                                 | (24)           | (24)            | (23)     |   |   |
| Unamortized Premium                                                                  | 12             | 12              | 17       |   |   |
| Unamortized Debt Issuance Costs                                                      | (40)           | (40)            | (34)     |   |   |
| Total Debt, Net of Discount                                                          | 6,807          | 6,807           | 7,074    |   |   |
| Capital Lease Obligations, Current                                                   | (61)           | (61)            | (63)     |   |   |
| Long-Term Debt Due After One Year                                                    | 6,746          | 6,746           | 7,011    |   |   |
| Repayments of term loan facility                                                     |           | 240             | 0        | $ 0 |   |
| Repayments of senior debt                                                            |           | 1,114           | 1,383    | $ 12 |   |
| Revolving Credit Facility, due August 27, 2020                                       |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 230          | $ 230           | $ 0      |   |   |
| Interest Rate                                                                        | 2.27%          | 2.27%           | 0.00%    |   |   |
| Noble Midstream Services Revolving Credit Facility, due September 20, 2021           |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 85           | $ 85            | $ 0      |   |   |
| Interest Rate                                                                        | 2.49%          | 2.49%           | 0.00%    |   |   |
| Term Loan Facility, due January 6, 2019                                              |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 0            | $ 0             | $ 550    |   |   |
| Interest Rate                                                                        | 0.00%          | 0.00%           | 2.01%    |   |   |
| Repayments of term loan facility                                                     | $ 550          |            |     |   |   |
| Leviathan Term Loan Facility, due February 23, 2025                                  |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 0            | $ 0             | $ 0      |   |   |
| Interest Rate                                                                        | 0.00%          | 0.00%           | 0.00%    |   |   |
| Senior Notes, due March 1, 2019                                                      |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 0            | $ 0             | $ 1,000  |   |   |
| Interest Rate                                                                        | 0.00%          | 0.00%           | 8.25%    |   | 8.25% |
| Senior Notes, due May 1, 2021                                                        |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 379          | $ 379           | $ 379    |   |   |
| Interest Rate                                                                        | 5.625%         | 5.625%          | 5.625%   |   |   |
| Senior Notes, due December 15, 2021                                                  |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 1,000        | $ 1,000         | $ 1,000  |   |   |
| Interest Rate                                                                        | 4.15%          | 4.15%           | 4.15%    |   |   |
| Senior Notes, due June 1, 2022                                                       |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 0            | $ 0             | $ 18     |   |   |
| Interest Rate                                                                        | 0.00%          | 0.00%           | 5.875%   |   |   |
| Repayments of senior debt                                                            | $ 18           |            |     |   |   |
| Senior Notes due October 15, 2023                                                    |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 100          | $ 100           | $ 100    |   |   |
| Interest Rate                                                                        | 7.25%          | 7.25%           | 7.25%    |   |   |
| Senior Notes Due November 15, 2024                                                   |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 650          | $ 650           | $ 650    |   |   |
| Interest Rate                                                                        | 3.90%          | 3.90%           | 3.90%    |   |   |
| Senior Notes, due April 1, 2027                                                      |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 250          | $ 250           | $ 250    |   |   |
| Interest Rate                                                                        | 8.00%          | 8.00%           | 8.00%    |   |   |
| Senior Notes, due January 15, 2028                                                   |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 600          | $ 600           | $ 0      |   |   |
| Interest Rate                                                                        | 3.85%          | 3.85%           | 0.00%    |   |   |
| Senior Notes, due March 1, 2041                                                      |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 850          | $ 850           | $ 850    |   |   |
| Interest Rate                                                                        | 6.00%          | 6.00%           | 6.00%    |   |   |
| Senior Notes, due November 15, 2043                                                  |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 1,000        | $ 1,000         | $ 1,000  |   |   |
| Interest Rate                                                                        | 5.25%          | 5.25%           | 5.25%    |   |   |
| Senior Notes, due November 15, 2044                                                  |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 850          | $ 850           | $ 850    |   |   |
| Interest Rate                                                                        | 5.05%          | 5.05%           | 5.05%    |   |   |
| Senior Notes, due August 15, 2047                                                    |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 500          | $ 500           | $ 0      |   |   |
| Interest Rate                                                                        | 4.95%          | 4.95%           | 0.00%    |   | 4.95% |
| Other Senior Notes and Debentures                                                    |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 92           | $ 92            | $ 92     |   |   |
| Interest Rate                                                                        | 7.13043%       | 7.13043%        | 7.13043% |   |   |
| Capital Lease and Other Obligations                                                  |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Capital Lease Obligations                                                            | $ 273          | $ 273           | $ 375    |   |   |
| Interest Rate                                                                        | 0.00%          | 0.00%           | 0.00%    |   |   |
| Senior Notes, due June 1, 2024                                                       |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 8            | $ 8             |     |   |   |
| Senior Debentures due August 1, 2097                                                 |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 84           | $ 84            |     |   |   |
| Senior Notes due June 1, 2022, June 1, 2024 and Senior Debentures due August 1, 2097 |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt, Weighted Average Interest Rate                                                 | 7.13%          | 7.13%           |     |   |   |
| Marcellus Shale | Capital Lease and Other Obligations                                |           |            |     |   |   |
| **Debt Instrument [Line Items]**                                                     |           |            |     |   |   |
| Debt                                                                                 | $ 41           | $ 41            |     |   |   |
| Capital lease principal payments                                                     |           | $ 60            |     |   |   |

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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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| - Definition
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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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, after accumulated amortization, of debt discount.
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| - Definition
Amount, after accumulated amortization, of debt premium.
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Weighted average interest rate of debt outstanding.
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| - Definition
Amount of cash outflow for principal payment on finance lease.
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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
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.
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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.
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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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