COMMITMENTS AND CONTINGENCIES - Schedule of Fair Value, Off-balance Sheet Risks (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Financing assets (excluding leases)
Other Commitments [Line Items]
Credit related commitments	$ 52,514	$ 53,250
Standby letters of credit
Other Commitments [Line Items]
Credit related commitments	2,305	2,188
Other letters of credit
Other Commitments [Line Items]
Credit related commitments	99	103
Deferred Purchase Agreements
Other Commitments [Line Items]
Credit related commitments	1,602	1,802
Purchase and Funding Commitments
Other Commitments [Line Items]
Credit related commitments	$ 119	$ 178