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Borrowed Funds (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Borrowed funds | $ 35,984 | $ 30,784
Parent Company |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 10,426 | 11,351
Parent Company | Senior debt |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 8,641 | 10,369
Basis adjustments - Fair value accounting hedges | (462) |
Parent Company | Subordinated debt |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 1,580 | 777
Basis adjustments - Fair value accounting hedges | (9) |
Subsidiaries |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 21,419 | 16,306
Subsidiaries | Senior debt |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 5,717 | 10,292
Basis adjustments - Fair value accounting hedges | (128) |
Subsidiaries | Subordinated debt |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 5,702 | $ 6,014
Basis adjustments - Fair value accounting hedges | $ (117) |

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