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Deposits - Maturities of Time Deposits Outstanding (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Banking and Thrift, Interest [Abstract]    
2022 $ 17,637  
2023 2,298  
2024 1,640  
2025 655  
2026 434  
Thereafter 1  
Total $ 22,665 $ 30,694