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Supplemental Financial Information - Other Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Other Assets [Abstract]    
Asset derivative contracts, net $ 84 $ 120
Intangible assets 416 426
Capital lease receivable 79 90
Non-current prepaid maintenance 113 6
Other 151 132
Other assets $ 843 $ 774