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
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]    
Constant prepayment rate (annualized), actual 7.60% 7.05%
Constant prepayment rate (annualized), 10% adverse change $ (13) $ (13)
Constant prepayment rate (annualized), 20% adverse change $ (25) $ (25)
Spread over forward interest rate swap rates, actual 5.71% 5.78%
Spread over forward interest rate swap rates, 10% adverse change $ (11) $ (12)
Spread over forward interest rate swap rates, 20% adverse change $ (22) $ (22)