Quarterly report [Sections 13 or 15(d)]

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Fair Value Method Key Assumptions (Details)

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MORTGAGE LOAN SALES AND SERVICING RIGHTS - Residential Mortgage Portfolio, MSRs Fair Value Method Key Assumptions (Details) - Fair value method - Residential mortgage - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Servicing Assets at Fair Value [Line Items]    
Constant prepayment rate (annualized), actual 8.20% 7.54%
Constant prepayment rate (annualized), 10% adverse change $ (15) $ (14)
Constant prepayment rate (annualized), 20% adverse change $ (29) $ (28)
Spread over forward interest rate swap rates, actual 5.67% 5.68%
Spread over forward interest rate swap rates, 10% adverse change $ (13) $ (13)
Spread over forward interest rate swap rates, 20% adverse change $ (26) $ (26)