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SECURITIES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Taxable interest income from securities | $ 165 | $ 154 | $ 333 | $ 314 |  |  |  |
Impaired debt securities sold | 0 | 0 | 0 | 0 |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Securitizations of mortgage loans | 29 | 22 | 55 | 44 |  |  |  |
Available-for-sale Securities |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Cumulative credit losses recognized in earnings | 81 | 79 | 81 | 79 | $ 80 | $ 80 | $ 75 | $ 75
OTTI in earnings | 1 | 4 | 2 | 5 |  |  |  |
Held-to-maturity Securities |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Cumulative credit losses recognized in earnings | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |

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