Debt - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Details) - USD ($) $ in Millions |
Mar. 31, 2019 |
Dec. 31, 2018 |
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||
Carrying Amount, Debt | $ 16,073 | $ 16,066 | |||||
Senior notes [Member] | Carrying Amount [Member] | |||||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||
Carrying Amount, Debt | [1] | 15,282 | 15,275 | ||||
Senior notes [Member] | Estimated Fair Value [Member] | |||||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||
Senior Notes, Estimated Fair Value | [1] | 16,418 | 15,672 | ||||
2037 SPL Senior Notes [Member] | Carrying Amount [Member] | |||||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||
Carrying Amount, Debt | [2] | 791 | 791 | ||||
2037 SPL Senior Notes [Member] | Estimated Fair Value [Member] | |||||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||
Senior Notes, Estimated Fair Value | [2] | $ 858 | $ 817 | ||||
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