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Loans and Related Allowance for Credit Losses (Narrative) (Details)
3 Months Ended
Mar. 31, 2024
USD ($)
portfolio_segment
Mar. 31, 2023
USD ($)
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 $ 315,088,000,000   $ 316,717,000,000
Subsequently defaulted FDM/ TDR 49,000,000 $ 0  
Allowance for credit loss $ 5,365,000,000 $ 5,413,000,000 5,500,000,000
Short-Term Repayment Plan      
Financing Receivable, Credit Quality Indicator [Line Items]      
Weighted average interest rate reduction 4.99%    
Short-Term Repayment Plan | Minimum      
Financing Receivable, Credit Quality Indicator [Line Items]      
Repayment plan term 6 months    
Minimum payment percentage 1.90%    
Short-Term Repayment Plan | Maximum      
Financing Receivable, Credit Quality Indicator [Line Items]      
Repayment plan term 12 months    
Fully-amortized Repayment Plans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Repayment plan term 60 months    
Weighted average interest rate reduction 4.99%    
Fully-amortized Repayment Plans | Minimum      
Financing Receivable, Credit Quality Indicator [Line Items]      
Minimum payment percentage 1.90%    
Federal Reserve Bank | Asset Pledged as Collateral without Right      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, After Allowance for Credit Loss $ 50,800,000,000   51,300,000,000
Federal Home Loan Bank | Asset Pledged as Collateral without Right      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing Receivable, After Allowance for Credit Loss $ 90,900,000,000   $ 89,500,000,000