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Regulatory Capital and Reserve Requirements Regulatory Capital and Reserve Requirements (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Federal Reserve Bank average reserve requirement   $ 135  
Dividends available to be paid to parent company without obtaining prior approval from bank regulatory agencies $ 347    
Dividends from bank subsidiaries $ 852 $ 498 $ 1,200
Total risk-based capital 10.00% 10.00%  
Tier 1 risk-based capital 6.00% 6.00%  
U.S. Banking Subsidiaries      
Total risk-based capital 10.00%    
Tier 1 risk-based capital 8.00%    
CET1 risk-based capital 6.50%    
Leverage ratio 5.00%