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Regulatory Capital and Reserve Requirements Regulatory Capital and Reserve Requirements (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dividends available to be paid to parent company with prior approval from bank regulatory agencies $ 506    
Dividends from bank subsidiaries $ 1,000 $ 852 $ 498
Total risk-based capital 10.00% 10.00%  
Tier 1 risk-based capital 6.00% 6.00%  
Minimum      
Capital conservation buffer 2.50% 2.50%  
U.S. Banking Subsidiaries      
Total risk-based capital 10.00% 10.00%  
Tier 1 risk-based capital 8.00% 8.00%  
CET1 risk-based capital 6.50% 6.50%  
Leverage ratios 5.00% 5.00%