Debt - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Details) - USD ($) $ in Millions |
Dec. 31, 2017 |
Dec. 31, 2016 |
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|---|---|---|---|---|---|---|---|---|---|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||||
| Carrying Amount, Debt | $ 16,046 | $ 14,433 | |||||||
| Senior Notes, net of premium or discount [Member] | Carrying Amount [Member] | |||||||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||||
| Carrying Amount, Debt | [1] | 14,360 | 11,513 | ||||||
| Senior Notes, net of premium or discount [Member] | Estimated Fair Value [Member] | |||||||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||||
| Senior Notes, Estimated Fair Value | [1] | 15,485 | 12,309 | ||||||
| 2037 SPL Senior Notes [Member] | Carrying Amount [Member] | |||||||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||||
| Carrying Amount, Debt | [2] | 800 | 0 | ||||||
| 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] | 871 | 0 | ||||||
| Credit facilities [Member] | Carrying Amount [Member] | |||||||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||||
| Carrying Amount, Debt | [3] | 1,090 | 3,098 | ||||||
| Credit facilities [Member] | Estimated Fair Value [Member] | |||||||||
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |||||||||
| Credit Facilities, Estimated Fair Value | [3] | $ 1,090 | $ 3,098 | ||||||
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