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Deposits - Composition of Deposits (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Banking and Thrift, Interest [Abstract]    
Noninterest-bearing deposits $ 134,901 $ 118,089
Interest-bearing deposits    
Interest checking 115,108 95,894
Money market savings 117,619 128,058
Savings accounts 65,790 57,035
Time deposits 22,665 30,694
Total interest-bearing deposits 321,182 311,681
Total deposits $ 456,083 $ 429,770