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MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio (Details) - Residential mortgage - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Servicing Asset at Amortized Cost [Line Items]        
Residential mortgage loans sold with servicing retained $ 1,748 $ 1,514 $ 5,102 $ 3,691
Pretax gains resulting from above loan sales 46 24 123 66
Total servicing, late, and other ancillary fees $ 35 $ 27 $ 102 $ 80