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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

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