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Stockholders' Equity and Redeemable Noncontrolling Interest - Redeemable Noncontrolling Interest Activity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]      
Balance at beginning of period $ 70 $ 69 $ 68
Distributions (35) (35) (35)
Share of income 34 34 34
Adjustment to redemption value of redeemable noncontrolling interest 8 2 2
Balance at end of period $ 77 $ 70 $ 69