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Shareholders' Equity - Comprehensive Capital Plan (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 10, 2021
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]            
Common stock repurchased during period   $ 125   $ 0 $ 559 $ 117
Initial shares received under accelerated share repurchase program (in shares) 23.6          
Cash payment $ 585          
Accelerated share repurchase program, current market price (in dollars per share) $ 19.87          
Cash dividends declared on Common Shares (in usd per share)   $ 0.185   $ 0.185 $ 0.555 $ 0.555
2021 Capital Plan            
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]            
Common stock repurchased during period     $ 593      
Reduction to capital surplus for accelerated repurchase program   $ (117)        
Cash dividends declared on Common Shares (in usd per share)   $ 0.185        
Initial Settlement of Accelerated Share Repurchase Program            
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]            
Common stock repurchased during period     468      
Open Market Purchases            
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]            
Common stock repurchased during period     125      
Employee Equity Compensation Programs | Maximum            
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]            
Common stock repurchased during period     $ 1