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Borrowed Funds (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Borrowed funds | $ 47,026 | $ 60,263
Parent Company [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 11,506 | 9,825
Parent Company [Member] | Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 10,486 | 8,843
Basis adjustments - Fair value accounting hedges | 820 |
Parent Company [Member] | Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 815 | 777
Basis adjustments - Fair value accounting hedges | 67 |
Subsidiaries [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 31,198 | 41,660
Subsidiaries [Member] | Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 17,219 | 20,167
Basis adjustments - Fair value accounting hedges | 608 |
Subsidiaries [Member] | Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
Borrowed funds | 5,479 | $ 5,152
Basis adjustments - Fair value accounting hedges | $ 496 |

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