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INVESTMENT SECURITIES - Realized and Unrealized Gain (Loss) on Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]        
Net unrealized gains (losses) for equity securities with readily determinable fair value (RDFV) $ 9 $ 245 $ 19 $ 308
Proceeds from debt/equity securities sales and redemptions 1,229 2,873 2,453 7,109
Gross realized gains on debt securities 11 48 21 65
Gross realized losses and impairments on debt securities $ (12) $ (18) $ (29) $ (53)