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Loans and Related Allowance for Credit Losses (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
portfolio_segment
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]      
Number of portfolio segments | portfolio_segment 2    
Financing receivable, after allowance for credit loss $ 311,981   $ 316,717
Subsequently defaulted FDM/TDR   $ 100  
Allowance for credit loss and off-balance sheet liability $ 5,205 $ 5,435 5,454
Short-Term Repayment Plan      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 4.99%    
Fully-amortized Repayment Plans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable program term 60 months    
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 4.99%    
Minimum | Short-Term Repayment Plan      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable program term 6 months    
Financing receivable minimum payment percentage 1.90%    
Minimum | Fully-amortized Repayment Plans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable minimum payment percentage 1.90%    
Maximum | Short-Term Repayment Plan      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable program term 12 months    
Federal Reserve Bank | Asset Pledged as Collateral without Right      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable, after allowance for credit loss $ 43,400   51,300
Federal Home Loan Bank | Asset Pledged as Collateral without Right      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable, after allowance for credit loss $ 89,000   $ 89,500