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 6 Months Ended
Mar. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]      
Constant prepayment rate (annualized), actual 17.36% 12.94%  
Constant prepayment rate (annualized), 10% adverse change   $ (15) $ (12)
Constant prepayment rate (annualized), 20% adverse change   $ (29) (23)
Spread over forward interest rate swap rates, actual 5.19% 5.35%  
Spread over forward interest rate swap rates, 10% adverse change   $ (7) (4)
Spread over forward interest rate swap rates, 20% adverse change   $ (14) $ (8)