FAIR VALUE MEASUREMENTS - Schedule of Assets Measured on Recurring Basis Level 3 Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,397	$ 1,564	$ 1,491	$ 1,552
Issuances	48	25	75	43
Sales	0		(72)
Settlements	(40)	(43)	(79)	(89)
Changes in fair value recognized in earnings	21	22	11	62
Ending balance	1,426	1,568	1,426	1,568
Other Derivative Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	5	8	1	7
Issuances	18	16	34	29
Sales	0		0
Settlements	(11)	(13)	(27)	(23)
Changes in fair value recognized in earnings	3	(5)	7	(7)
Ending balance	$ 15	$ 6	$ 15	$ 6