Annual report pursuant to Section 13 and 15(d)

Debt - Interest Expense (Details)

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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