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MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio (Details) - Residential mortgage - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Servicing Asset at Amortized Cost [Line Items]        
Residential mortgage loans sold with servicing retained $ 2,045 $ 1,168 $ 3,354 $ 2,177
Pretax gains resulting from above loan sales 49 23 77 42
Total servicing, late, and other ancillary fees $ 34 $ 26 $ 67 $ 53