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Divestitures and Acquisition Sale of Noncontrolling Interest in ELC (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 28, 2017
Property, Plant and Equipment [Line Items] |  |  |  |
Contributions from investment partner | $ 181 | $ 485 | $ 0 |
Sale of Equity Interest in Elba Liquification Company LLC [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  | 49.00%
Controlling Interest, Ownership Percentage by Parent |  |  |  | 51.00%
Contributions from investment partner | $ 386 |  |  |

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