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Investment Securities (Gains (Losses) on Sales of Securities Available for Sale) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Investment Securities Disclosure [Abstract]    
Gross Gains $ 275 $ 256
Gross Losses (225) (2)
Net Gains 50 254
Tax Expense $ 11 $ 53