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Redeemable Noncontrolling Interests - Redeemable Noncontrolling Interest Activity (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Increase (Decrease) in Temporary Equity [Roll Forward]    
Balance at beginning of period $ 259 $ 262
Distributions paid to redeemable noncontrolling interests (10) (12)
Share of income 10 9
Balance at end of period $ 259 $ 259