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Interest Cost Components (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Disclosure [Abstract] |  |  |  |
Amount charged to expense | $ 24 | $ 378 | $ 496 | $ 499
Amount capitalized |  | 23 | 22 | 32
Interest costs |  | $ 401 | $ 518 | $ 531

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