Quarterly report pursuant to Section 13 or 15(d)

Debt - Interest Expense (Details)

v3.10.0.1
Debt - Interest Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Debt Instrument [Line Items]        
Total interest cost $ 412 $ 377 $ 816 $ 731
Capitalized interest (196) (189) (384) (378)
Total interest expense, net 216 188 432 353
Convertible Debt [Member]        
Debt Instrument [Line Items]        
Interest per contractual rate 58 54 116 107
Amortization of debt discount 8 7 16 14
Amortization of debt issuance costs 2 2 4 3
Total interest cost 68 63 136 124
Debt Excluding Convertible Debt [Member]        
Debt Instrument [Line Items]        
Total interest cost $ 344 $ 314 $ 680 $ 607