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Borrowed Funds (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Borrowed funds | $ 60,822 | $ 58,713
Parent Company |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 16,041 | 13,103
Parent Company | Senior debt |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 14,287 | 11,374
Basis adjustments - Fair value accounting hedges | (557) |
Parent Company | Subordinated debt |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 1,549 | 1,524
Basis adjustments - Fair value accounting hedges | (47) |
Subsidiaries |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 41,231 | 41,936
Subsidiaries | Senior debt |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 5,335 | 5,283
Basis adjustments - Fair value accounting hedges | (202) |
Subsidiaries | Subordinated debt |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 3,876 | $ 4,578
Basis adjustments - Fair value accounting hedges | $ (179) |

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