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SECURITIES - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Taxable interest income from securities | $ 164,000,000 | $ 165,000,000 | $ 330,000,000 | $ 333,000,000 |  |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Securitizations of mortgage loans | 13,000,000 | 29,000,000 | 44,000,000 | 55,000,000 |  |  |  |
Available-for-sale Securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Cumulative credit losses recognized in earnings | 57,000,000 | 81,000,000 | 57,000,000 | 81,000,000 | $ 78,000,000 | $ 81,000,000 | $ 80,000,000 | $ 80,000,000
OTTI in earnings | 0 | 1,000,000 | 1,000,000 | 2,000,000 |  |  |  |
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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