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Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Redeemable noncontrolling interest activity [Roll Forward]    
Balance as of beginning of the period $ 77 $ 70
Distributions (16) (18)
Share of income 17 18
Adjustment to redemption value of redeemable noncontrolling interest (4) 8
Balance as of end of the period $ 74 $ 78