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Goodwill and Other Intangibles - Schedule of Finite-Lived Intangible Assets, Future Amortization Expense (Details) - Core Deposits - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]    
2023 $ 21  
2024 19  
2025 16  
2026 16  
2027 15  
Thereafter 69  
Balance, net of accumulated amortization $ 156 $ 19