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PREMISES, EQUIPMENT, AND SOFTWARE - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Capital Leases of Lessee [Abstract] |  |  |
Depreciation expense | $ 107 | $ 98 | $ 110
Capitalized Software |  |  |
Capitalized software, gross | 2,600 | 2,300 |
Capitalized software, accumulated amortization | 1,700 | 1,500 |
Amortization of software | $ 243 | $ 235 | $ 215

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