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Borrowed Funds (FHLB Borrowings, Bank Notes, Senior Debt and Subordinated Debt) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Carrying Value | $ 58,601 | $ 69,711
Parent Company |  |
Debt Instrument [Line Items] |  |
Carrying Value | 28,352 | 23,971
Bank |  |
Debt Instrument [Line Items] |  |
Carrying Value | 30,249 | 45,740
Senior debt | Parent Company |  |
Debt Instrument [Line Items] |  |
Carrying Value | $ 27,369 | 22,221
Senior debt | Parent Company | Minimum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 1.15% |
Senior debt | Parent Company | Maximum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 6.88% |
Senior debt | Bank |  |
Debt Instrument [Line Items] |  |
Carrying Value | $ 5,128 | 4,615
Senior debt | Bank | Minimum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.95% |
Senior debt | Bank | Maximum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.87% |
Subordinated debt | Parent Company |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.63% |
Carrying Value | $ 777 | 1,544
Subordinated debt | Bank |  |
Debt Instrument [Line Items] |  |
Carrying Value | $ 3,121 | 3,125
Subordinated debt | Bank | Minimum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.70% |
Subordinated debt | Bank | Maximum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 5.90% |
Junior subordinated debt | Parent Company |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 5.33% |
Carrying Value | $ 206 | 206
Federal Home Loan Bank advances | Bank |  |
Debt Instrument [Line Items] |  |
Carrying Value | $ 22,000 | $ 38,000
Federal Home Loan Bank advances | Bank | Minimum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.63% |
Federal Home Loan Bank advances | Bank | Maximum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.96% |

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