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Loans and Related Allowance for Credit Losses (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
portfolio_segment
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]      
Number of portfolio segments | portfolio_segment 2    
Financing receivable, after allowance for credit loss $ 321,284 $ 283,504  
Recorded Investment - Subsequently defaulted TDRs 100 100 $ 100
Allowance for credit loss and off-balance sheet liability 5,435 5,530 $ 5,945
Increase (decrease) in allowance for credit loss (100)    
Nonperforming | TDRs      
Financing Receivable, Credit Quality Indicator [Line Items]      
Troubled debt restructurings (TDRs) 700 1,000  
Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Troubled debt restructurings (TDRs) 700 600  
Federal Reserve Bank | Asset Pledged as Collateral without Right      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable, after allowance for credit loss 28,100 25,700  
Federal Home Loan Bank | Asset Pledged as Collateral without Right      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable, after allowance for credit loss $ 90,400 $ 66,200