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Equity - Schedule of changes to redeemable noncontrolling interest (Details)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
Increase (Decrease) in Temporary Equity [Roll Forward]  
Balance as of December 31, 2016 $ 1,080
Net income attributable to noncontrolling interest 61
Distributions payable to noncontrolling interest (36)
Redemption value adjustment 2
Balance as of June 30, 2017 $ 1,107