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Deposits - Composition of Deposits (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
Noninterest-bearing deposits $ 86,097 $ 83,766
Interest-bearing deposits    
Interest checking 66,298 59,169
Money market savings 109,947 86,159
Savings accounts 41,783 38,468
Time deposits 30,465 32,838
Total interest-bearing deposits [1] 248,493 216,634
Total deposits $ 334,590 $ 300,400
[1] lncludes time deposits greater than $250,000 balances of $3.0 billion and $2.6 billion at December 31, 2016 and 2015, respectively.