Debt - Interest Expense (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Debt Disclosure [Abstract] | |||
| Total interest cost | $ 902 | $ 841 | $ 708 |
| Capitalized interest | (288) | (484) | (523) |
| Total interest expense, net | $ 614 | $ 357 | $ 185 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of interest capitalized during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|