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Goodwill and Core Deposit Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization of Core Deposit Intangibles (Details) - Core deposit intangibles - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Gross balance | $ 501 | $ 271 |
Accumulated amortization | (189) | (131) |
Balance, net of accumulated amortization | $ 312 | $ 140 | $ 19

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