FAIR VALUE MEASUREMENTS - Schedule of Assets Measured on Recurring Basis Level 3 Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,552	$ 1,530
Issuances	106	127
Sales	(99)	0
Settlements	(176)	(166)
Changes in fair value during the period recognized in earnings	108	61
Ending balance	1,491	1,552
Other Derivative Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	7	1
Issuances	60	64
Sales	0	0
Settlements	(41)	(24)
Changes in fair value during the period recognized in earnings	(25)	(34)
Ending balance	$ 1	$ 7