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Basis of Presentation and Significant Accounting Policies Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Derivative [Line Items]      
Stockholders' Equity Attributable to Noncontrolling Interest $ 60   $ 60
Preferred Stock, Shares Issued 0    
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest $ 0    
Noncontrolling Interest, Change in Redemption Value 13    
Business Acquisition, Percentage of Voting Interests Acquired   80.00%  
Business Combination, Redeemable Noncontrolling Percentage   20.00%  
Xchange      
Derivative [Line Items]      
Redeemable Noncontrolling Interest, Equity, Carrying Amount     $ 7
Redeemable Noncontrolling Interest, Equity, Redemption Value 20    
Retained Earnings [Member]      
Derivative [Line Items]      
Noncontrolling Interest, Change in Redemption Value $ 13