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Redeemable Noncontrolling Interests - Reconciliation of Changes in Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance, beginning of period $ 100 $ 47
Capital contribution from redeemable noncontrolling interests 1  
Net income (loss) attributable to redeemable noncontrolling interests (1) 1
Other comprehensive income (loss) attributable to redeemable noncontrolling interests 5 1
Balance, end of period $ 105 $ 49