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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]          
Servicing income $ 23 $ 17 $ 45 $ 35  
Unpaid principal balance of third party serviced loans $ 32,000   $ 32,000   $ 31,000