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Loans and Related Allowance for Credit Losses (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
portfolio_segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]      
Number of portfolio segments | portfolio_segment 2    
Allowance for credit loss and off-balance sheet liability $ 5,530 $ 5,945  
Increase (decrease) in allowance for credit loss (400)    
TDRs      
Financing Receivable, Credit Quality Indicator [Line Items]      
Recorded Investment - Subsequently defaulted TDRs 100 100 $ 100
Nonperforming | TDRs      
Financing Receivable, Credit Quality Indicator [Line Items]      
Troubled debt restructurings (TDRs) 1,000 900  
Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Troubled debt restructurings (TDRs) 600 700  
Federal Reserve Bank      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans pledged as collateral for the ability to borrow 25,700 30,100  
Federal Home Loan Bank      
Financing Receivable, Credit Quality Indicator [Line Items]      
Loans pledged as collateral for the ability to borrow $ 66,200 $ 69,000