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Loans and Related Allowance for Credit Losses (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) portfolio_segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Number of portfolio segments | portfolio_segment | 2 |  |
Financing receivable, after allowance for credit loss | $ 316,717 | $ 321,284 |
Subsequently defaulted FDM/TDR |  | 100 | $ 100
Allowance for credit loss and off-balance sheet liability | $ 5,454 | 5,435 | $ 5,530
Short-Term Repayment Plan |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Weighted-Average Interest Rate Reduction | 4.99% |  |
Fully-amortized Repayment Plans |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable program term | 60 months |  |
Weighted-Average Interest Rate Reduction | 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 | $ 51,300 | 28,100 |
Federal Home Loan Bank | Asset Pledged as Collateral without Right |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, after allowance for credit loss | $ 89,500 | $ 90,400 |

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