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SECURITIES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Taxable interest income from securities | $ 167 | $ 155 | $ 500 | $ 469 |  |  |  |
Impaired debt securities sold | 0 | 0 | 0 | 0 |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Securitizations of mortgage loans | 32 | 38 | 87 | 82 |  |  |  |
Available-for-sale Securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Cumulative credit losses recognized in earnings | 81 | 80 | 81 | 80 | $ 81 | $ 80 | $ 79 | $ 75
OTTI in earnings | 1 | 1 | 3 | 6 |  |  |  |
Held-to-maturity Securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Cumulative credit losses recognized in earnings | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |

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