COMMITMENTS AND CONTINGENCIES - Schedule of Fair Value, Off-balance Sheet Risks (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Financing assets (excluding leases)
Other Commitments [Line Items]
Credit related commitments	$ 52,806	$ 53,250
Standby letters of credit
Other Commitments [Line Items]
Credit related commitments	2,258	2,188
Other letters of credit
Other Commitments [Line Items]
Credit related commitments	66	103
Deferred Purchase Agreements
Other Commitments [Line Items]
Credit related commitments	1,463	1,802
Purchase and Funding Commitments
Other Commitments [Line Items]
Credit related commitments	$ 57	$ 178