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, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]      
Total interest cost $ 936 $ 902 $ 841
Capitalized interest (203) (288) (484)
Total interest expense, net $ 733 $ 614 $ 357