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Redeemable Noncontrolling Interests - Redeemable Noncontrolling Interest Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Increase (Decrease) in Temporary Equity [Roll Forward]      
Balance at beginning of period   $ 259 $ 262
Distributions paid to redeemable noncontrolling interests $ (12) (32) (31)
Share of income   33 29
Balance at end of period $ 260 $ 260 $ 260