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Investment Securities (Gains (Losses) on Sales of Securities Available for Sale) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]      
Gross Gains   $ 2
Gross Losses $ (497) (501) (2)
Net Gains (Losses)   (499) (2)
Tax Expense (Benefit)   $ (105)