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PREMISES, EQUIPMENT, AND SOFTWARE - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Capital Leases of Lessee [Abstract] |  |  |
Depreciation expense | $ 117 | $ 124 | $ 130
Capitalized Software |  |  |
Capitalized software, gross | 1,800 | 1,700 |
Capitalized software, accumulated amortization | 948 | 869 |
Amortization of software | 189 | 180 | $ 170
Assets subject to operating leases | $ 92 | $ 112 |

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