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SECURITIES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Taxable interest income from investment securities | $ 672 | $ 625 | $ 584 |
Impaired debt securities sold | 0 | 0 | 0 |
Pretax non-credit related losses were deferred in OCI | 4 | 0 | 27 |
Mortgage-backed securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Securitizations of mortgage loans | 142 | 134 | 68 |
Available-for-sale Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cumulative credit losses recognized in earnings | 81 | 80 | 75 | $ 66
Credit impairments recognized in earnings on securities that have been previously impaired | 3 | 7 | 12 |
Held-to-maturity Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cumulative credit losses recognized in earnings | $ 0 | $ 0 | $ 0 |

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