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Borrowed Funds (FHLB Borrowings, Bank Notes, Senior Debt and Subordinated Debt) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Borrowed funds | $ 58,713 | $ 30,784
Total FHLB, Senior and Sub Debt | 55,039 | 27,657
Parent Company |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 13,103 | 11,351
Bank |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 41,936 | 16,306
Senior Notes | Parent Company |  |
Debt Instrument [Line Items] |  |
Borrowed funds | $ 11,374 | 10,369
Senior Notes | Parent Company | Minimum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 1.15% |
Senior Notes | Parent Company | Maximum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 6.04% |
Senior Notes | Bank |  |
Debt Instrument [Line Items] |  |
Borrowed funds | $ 5,283 | 10,292
Senior Notes | Bank | Minimum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.50% |
Senior Notes | Bank | Maximum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 5.07% |
Subordinated Debt | Parent Company |  |
Debt Instrument [Line Items] |  |
Borrowed funds | $ 1,524 | 777
Subordinated Debt | Parent Company | Minimum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.90% |
Subordinated Debt | Parent Company | Maximum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.63% |
Subordinated Debt | Bank |  |
Debt Instrument [Line Items] |  |
Borrowed funds | $ 4,578 | 6,014
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% |
Borrowed funds | $ 205 | 205
FHLB | Bank |  |
Debt Instrument [Line Items] |  |
Borrowed funds | $ 32,075 |
FHLB | Bank | Minimum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.48% |
FHLB | Bank | Maximum |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.72% |

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