Quarterly report pursuant to Section 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, 2024
Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]    
Constant prepayment rate (annualized), actual 8.15% 8.61%
Constant prepayment rate (annualized), 10% adverse change $ (14) $ (15)
Constant prepayment rate (annualized), 20% adverse change $ (28) $ (28)
Spread over forward interest rate swap rates, actual 5.50% 5.38%
Spread over forward interest rate swap rates, 10% adverse change $ (12) $ (11)
Spread over forward interest rate swap rates, 20% adverse change $ (23) $ (22)