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PREMISES, EQUIPMENT, AND SOFTWARE - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Capital Leases of Lessee [Abstract] |  |  |
Depreciation expense | $ 115 | $ 107 | $ 98
Capitalized Software |  |  |
Capitalized software, gross | 2,600 | 2,600 |
Capitalized software, accumulated amortization | 1,700 | 1,700 |
Amortization of software | $ 254 | $ 243 | $ 235

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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481283/985-20-50-1 + Details
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