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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]          
Servicing income $ 25 $ 23 $ 72 $ 68  
Unpaid principal balance of third party serviced loans $ 33,000   $ 33,000   $ 32,400