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Loans and Related Allowance for Credit Losses (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
portfolio_segment
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
portfolio_segment
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Number of portfolio segments | portfolio_segment 2   2    
Financing receivable, threshold period past due, subsequently defaulted     60 days    
Allowance for credit loss $ 5,143 $ 6,375 $ 5,143 $ 6,375  
Decrease in allowance for credit loss     400    
Performing Financial Instruments          
Troubled debt restructurings (TDRs) 700   700   $ 600
TDRs          
Amortized Cost - Subsequently Defaulted TDRs 20 $ 14 27 $ 26  
TDRs | Nonperforming loans          
Troubled debt restructurings (TDRs) 700   700   1,000
Federal Reserve Bank          
Loans pledged as collateral for the ability to borrow 24,900   24,900   25,700
Federal Home Loan Bank          
Loans pledged as collateral for the ability to borrow $ 85,900   $ 85,900   $ 66,200