COMMITMENTS AND CONTINGENCIES - Schedule of Fair Value, Off-balance Sheet Risks (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Financing assets (excluding leases)
Other Commitments [Line Items]
Credit related commitments	$ 56,147	$ 57,567
Standby letters of credit
Other Commitments [Line Items]
Credit related commitments	2,261	2,412
Other letters of credit
Other Commitments [Line Items]
Credit related commitments	108	103
Deferred Purchase Agreements
Other Commitments [Line Items]
Credit related commitments	1,902	2,076
Purchase and Funding Commitments
Other Commitments [Line Items]
Credit related commitments	$ 372	$ 685