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Borrowed Funds (FHLB Borrowings, Bank Notes, Senior Debt and Subordinated Debt) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Borrowed Funds | $ 60,263 | $ 57,419
Total FHLB, Senior and Sub Debt | 51,485 | 52,414
Parent Company |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 9,825 | 6,715
Bank |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 41,660 | 45,699
Senior Notes | Parent Company |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | 8,843 | 5,063
Senior Notes | Bank |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | $ 20,167 | 19,955
Senior Notes | Maximum | Parent Company |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 5.13% |
Senior Notes | Maximum | Bank |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 3.50% |
Senior Notes | Minimum | Parent Company |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.20% |
Senior Notes | Minimum | Bank |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 1.38% |
Subordinated Debt | Parent Company |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | $ 777 | 1,447
Stated interest rate | 3.90% |
Subordinated Debt | Bank |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | $ 5,152 | 4,243
Subordinated Debt | Maximum | Bank |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.20% |
Subordinated Debt | Minimum | Bank |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 2.70% |
Junior Subordinated Debt | Parent Company |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | $ 205 | 205
Stated interest rate | 2.48% |
FHLB | Bank |  |
Debt Instrument [Line Items] |  |
Borrowed Funds | $ 16,341 | $ 21,501
FHLB | Maximum | Bank |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 6.35% |
FHLB | Minimum | Bank |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 0.00% |

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