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Deposits - Composition of Deposits (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Banking and Thrift, Interest [Abstract]    
Noninterest-bearing deposits $ 118,089 $ 75,590
Interest-bearing deposits    
Interest checking 95,894 75,949
Money market savings 128,058 120,082
Savings accounts 57,035 47,401
Time deposits 30,694 42,894
Total interest-bearing deposits [1] 311,681 286,326
Total deposits $ 429,770 $ 361,916
[1] lncludes time deposits greater than $250,000 balances of $4.4 billion and $7.8 billion at December 31, 2020 and 2019, respectively.