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Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Redeemable noncontrolling interest activity [Roll Forward]    
Balance as of beginning of the period $ 73 $ 77
Distributions (8) (8)
Share of income 8 8
Adjustment to redemption value of redeemable noncontrolling interest (1) (4)
Balance as of end of the period $ 72 $ 73