MORTGAGE BANKING AND OTHER SERVICED LOANS - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
MSRs
Fair value as of beginning of the period			$ 1,552
Fair value at end of the period	$ 1,501		1,501
Residential mortgages
MSRs
Fair value as of beginning of the period	1,568	$ 1,524	1,552	$ 1,530
Amounts capitalized	28	47	71	104
Changes in unpaid principal balance during the period	(46)	(42)	(135)	(124)
Changes in fair value during the period	(49)	91	13	110
Fair value at end of the period	$ 1,501	$ 1,620	$ 1,501	$ 1,620