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Redeemable Noncontrolling Interests - Reconciliation of Changes in Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance, beginning of period $ 100 $ 47
Initial fair value of redeemable noncontrolling interests of acquired businesses 102
Capital contribution from redeemable noncontrolling interest 4 3
Purchase of redeemable noncontrolling interest (46)
Sale of redeemable noncontrolling interest 64  
Net income (loss) attributable to redeemable noncontrolling interests (6)
Other comprehensive income (loss) attributable to redeemable noncontrolling interests 5 (6)
Balance, end of period $ 167 $ 100