Quarterly report pursuant to Section 13 or 15(d)

MORTGAGE LOAN SALES AND SERVICING RIGHTS - Narrative (Details)

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MORTGAGE LOAN SALES AND SERVICING RIGHTS - Narrative (Details) - Residential Mortgage - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]          
Servicing income $ 22 $ 16 $ 57 $ 47  
Unpaid principal balance of third party serviced loans $ 30,600   $ 30,600   $ 23,500