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Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Redeemable noncontrolling interest activity [Roll Forward]    
Balance as of beginning of the period $ 77 $ 70
Distributions (25) (26)
Share of income 25 26
Adjustment to redemption value of redeemable noncontrolling interest (4) 8
Balance as of end of the period $ 73 $ 78