MORTGAGE BANKING AND OTHER SERVICED LOANS - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
MSRs
Fair value as of beginning of the period			$ 1,552
Fair value at end of the period	$ 1,568		1,568
Residential mortgages
MSRs
Fair value as of beginning of the period	1,564	$ 1,496	1,552	$ 1,530
Amounts capitalized	25	36	43	57
Changes in unpaid principal balance during the period	(43)	(41)	(89)	(82)
Changes in fair value during the period	22	33	62	19
Fair value at end of the period	$ 1,568	$ 1,524	$ 1,568	$ 1,524