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Acquisitions, Divestiture, and Discontinued Operations - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 04, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Apr. 03, 2019 Branch
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Goodwill |  | $ 2,516 | $ 2,664 | $ 2,516 | $ 2,538 |
Gain on sale |  |  | 0 | 83 | $ 0 |
Disposal Group, Not Discontinued Operations [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on sale | $ 73 | 5 |  |  |  |
Discontinued Operations [Member] | Government Guaranteed Loans [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Loans included in divestiture |  | $ 1,100 | 865 | $ 1,100 |  |
Laurel Road Bank [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of bank branches excluded from transaction | Branch |  |  |  |  |  | 3
Other intangible assets |  |  | 37 |  |  |
Goodwill |  |  | $ 148 |  |  |

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