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Investment Securities (Gains and Losses Recognized in Income from Securities) (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment Holdings      
Equity securities unrealized gains (losses) $ 26 $ (45) $ 5
Corporate Banking      
Investment Holdings      
Securities Gain losses $ 7