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Deposits - Composition of Deposits (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]    
Noninterest-bearing deposits $ 87,557 $ 86,097
Interest-bearing deposits    
Interest checking 74,520 66,298
Money market savings 107,973 109,947
Savings accounts 43,809 41,783
Time deposits 33,356 30,465
Total interest-bearing deposits [1] 259,658 248,493
Total deposits $ 347,215 $ 334,590
[1] Includes time deposits greater than $250,000 balances of $6.8 billion and $3.0 billion at December 31, 2017 and 2016, respectively.