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Noncontrolling Interests (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Noncontrolling Interest [Line Items]      
Redeemable Noncontrolling Interest, Equity, Common, Fair Value $ 10 $ 10 $ 0
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value 0 15  
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest (1) (5)  
Noncontrolling Interest, Impairment Charge (1) 0  
Noncontrolling Interest, Change in Redemption Value $ 2 $ 0