FAIR VALUE MEASUREMENTS - Schedule of Assets Measured on Recurring Basis Level 3 Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,491	$ 1,552
Issuances	27	18
Sales	(72)
Settlements	(39)	(46)
Change in fair value during the period recognized in earnings	(10)	40
Ending balance	1,397	1,564
Other Derivative Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	1	7
Issuances	16	13
Sales	0
Settlements	(16)	(10)
Change in fair value during the period recognized in earnings	4	(2)
Ending balance	$ 5	$ 8