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Goodwill and Core Deposit Intangibles - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - Core deposit intangibles - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]      
2024 $ 63    
2025 54    
2026 46    
2027 39    
2028 34    
Thereafter 76    
Balance, net of accumulated amortization $ 312 $ 140 $ 19