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Premises and Equipment - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Property, Plant and Equipment [Abstract] |  |  |
Depreciation and amortization expense | $ 87 | $ 91 | $ 89
Capitalized computer software | 692 | 597 |
Capitalized computer software, accumulated amortization | 399 | 308 |
In-process software amortization expense | $ 93 | $ 84 | $ 78

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