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Shareholders' Deficit (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Repurchase Of Shares Of Common Stock [Line Items]    
Repurchase of shares of Common Stock, value $ 407 [1] $ 275 [2]
Value of share repurchases with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date $ 64  
Number of shares repurchased with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date 500,000  
Value of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter   $ 11
Number of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter   100,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 543  
May 2021    
Repurchase Of Shares Of Common Stock [Line Items]    
Repurchase of shares of Common Stock, value 407 $ 0
Stock Repurchase Program, Authorized Amount 2,000  
Stock Repurchase Program, Remaining Authorized Repurchase Amount 543  
November 2019    
Repurchase Of Shares Of Common Stock [Line Items]    
Repurchase of shares of Common Stock, value   $ 275
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 0  
Issued Common Stock    
Repurchase Of Shares Of Common Stock [Line Items]    
Shares Repurchased 3,359,000 [1] 2,599,000 [2]
Repurchase of shares of Common Stock, value $ 22 $ 14
Issued Common Stock | May 2021    
Repurchase Of Shares Of Common Stock [Line Items]    
Shares Repurchased 3,359,000 0
Issued Common Stock | November 2019    
Repurchase Of Shares Of Common Stock [Line Items]    
Shares Repurchased 0 2,599,000
[1] 2022 amount includes the effect of $64 million in share repurchases (0.5 million shares) with trade dates on, or prior to, March 31, 2022, but cash settlement dates subsequent to March 31, 2022.
[2] 2021 amount excludes the effect of $11 million in share repurchases (0.1 million shares) with trade dates on, or prior to December 31, 2020, but cash settlement dates subsequent to December 31, 2020.