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Goodwill and Mortgage Servicing Rights (Goodwill by Business Segment 10-K) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |
Goodwill | $ 9,233 | $ 9,218 | $ 9,173
Retail Banking |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 5,795 | 5,795 | 5,795
Corporate & Institutional Banking |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 3,374 | 3,359 | 3,314
Goodwill from business acquisitions | 15 | 45 |
Asset Management Group |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 64 | $ 64 | $ 64

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