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Investment Securities - Realized Gain/Loss (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]      
Proceeds from sales of securities available for sale including loans that have been securitized $ 1,637 $ 228 $ 0
Gross realized gains 2 0 0
Gross realized losses $ (3) $ 0 $ 0