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Investment Securities (Gains (Losses) on Sales of Securities Available for Sale) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Investment Securities Disclosure [Abstract]    
Gross Gains $ 224 $ 47
Gross Losses (2) (15)
Net Gains (Losses) 222 32
Tax Expense (Benefit) $ 47 $ 7