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Loans and Related Allowance for Credit Losses (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
portfolio_segment
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Number of portfolio segments | portfolio_segment 2    
Financing receivable, threshold period past due, subsequently defaulted 60 days    
Allowance for credit loss $ 5,197 $ 5,221  
Decrease in allowance for credit loss 300    
Performing Financial Instruments      
Troubled debt restructurings (TDRs) 600   $ 600
TDRs      
Amortized Cost - Subsequently Defaulted TDRs 9 $ 15  
TDRs | Nonperforming loans      
Troubled debt restructurings (TDRs) 900   1,000
Federal Reserve Bank      
Loans pledged as collateral for the ability to borrow 25,000   25,700
Federal Home Loan Bank      
Loans pledged as collateral for the ability to borrow $ 87,300   $ 66,200