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Shareholders' Equity - Common Stock Repurchase Summary (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Class of Stock [Line Items]    
Total purchase price of shares repurchased and retired $ 3,470 $ 6,362
Common Stock    
Class of Stock [Line Items]    
Total number of shares repurchased and retired (in shares) 101  
Common Stock | CCAR capital plan repurchases    
Class of Stock [Line Items]    
Total purchase price of shares repurchased and retired $ 3,500