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Shareholders' Equity (Details) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 12,981 [1] 2,419 [1] 7,788 [2]  
Value of share repurchases with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date. $ 11   $ 5  
Number of shares repurchased with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date. 100   100  
Stock Repurchased During Period, Value $ 1,580 [1] $ 250 [1] $ 810 [2]  
May 2021        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 8,235 0 0  
Stock Repurchased During Period, Value $ 1,050 $ 0 $ 0  
November 2019 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 4,746 2,419 0  
Stock Repurchased During Period, Value $ 530 $ 250 $ 0  
August 2018 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 0 0 7,788  
Stock Repurchased During Period, Value $ 0 $ 0 $ 810  
May 2021        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchase Program, Authorized Amount 2,000      
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 950      
November 2019 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchase Program, Remaining Authorized Repurchase Amount       $ 1,200
[1] 2021 amount excludes and 2020 amount includes the effect of $11 million in share repurchases (0.1 million shares) with trade dates on, or prior to, December 31, 2020, but settlement dates subsequent to December 31, 2020.
[2] 2019 amount excludes the effect of $5 million in share repurchases (0.1 million shares) with trade dates on, or prior to, December 31, 2018, but settlement dates subsequent to December 31, 2018.