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Asset Acquisitions, Dispositions and Other (Details) - USD ($) | 1 Months Ended | 3 Months Ended
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Sep. 30, 2018 | Jul. 31, 2018 | Mar. 31, 2018 | Jan. 31, 2018 | Dec. 31, 2018
4.2% senior notes due 2048 |  |  |  |  |
Asset Acquisitions, Dispositions and Other |  |  |  |  |
Debt instrument issued |  |  | $ 1,000,000,000.0 |  |
Debt instrument interest rate stated percentage |  |  | 4.20% |  |
Net proceeds of debt |  |  | $ 985,000,000 |  |
1.50% senior notes due 2018 |  |  |  |  |
Asset Acquisitions, Dispositions and Other |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 1.50% |  |
Repayment of debt |  |  | $ 500,000,000 |  |
2018 Credit Facility |  |  |  |  |
Asset Acquisitions, Dispositions and Other |  |  |  |  |
Debt instrument issued |  |  |  | $ 3,000,000,000.0 |
Credit facility term |  |  |  | 5 years |
Previously leased power and steam cogeneration facility |  |  |  |  |
Asset Acquisitions, Dispositions and Other |  |  |  |  |
Acquisition cost |  | $ 443,000,000 |  |  |
Disposed of by sale | Non-core Midstream assets |  |  |  |  |
Asset Acquisitions, Dispositions and Other |  |  |  |  |
Divestiture consideration | $ 2,600,000,000 |  | 150,000,000 |  |
Proceeds received for divested assets | 2,400,000,000 |  |  |  |
Pre-tax net gain from divestiture | $ 902,000,000 |  | $ 43,000,000 |  |
Scenario, Forecast | Previously leased power and steam cogeneration facility |  |  |  |  |
Asset Acquisitions, Dispositions and Other |  |  |  |  |
Payment to acquire previously leased facility |  |  |  |  | $ 60,000,000

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