DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Asset Fair Value
Asset Fair Value	$ 659	$ 640
Less: gross amounts offset in the Consolidated Balance Sheets, Asset Fair Value	0	0
Derivative assets	659	640
Less: amounts subject to master netting agreements, Asset Fair Value	(61)	(97)
Less: cash collateral pledged (received) subject to master netting agreements	(534)	(405)
Total net derivative fair value, Asset Fair Value	64	138
Liability Fair Value
Liability Fair Value	(654)	(636)
Less: gross amounts offset in the Consolidated Balance Sheets, Liability Fair Value	0	0
Derivative liability	(654)	(636)
Less: amounts subject to master netting agreements, Asset Liability Value	61	97
Less: cash collateral pledged (received) subject to master netting agreements	8	39
Total net derivative fair value, Liability Fair Value	(585)	(500)
Variation margin, amount reducing derivative asset	83	66
Variation margin, amount reducing derivative liability	26	37
Qualifying Hedges
Liability Fair Value
Derivative instruments and hedges, assets	0	4
Derivative instruments and hedges, liabilities	0	0
Qualifying Hedges | Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	1,149	815
Asset Fair Value
Asset Fair Value	0	0
Liability Fair Value
Liability Fair Value	0	0
Non-qualifying Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	35,398	34,673
Asset Fair Value
Asset Fair Value	659	640
Liability Fair Value
Liability Fair Value	(654)	(636)
Non-qualifying Hedges | Interest rate contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	25,623	24,548
Asset Fair Value
Asset Fair Value	573	530
Liability Fair Value
Liability Fair Value	(590)	(518)
Non-qualifying Hedges | Foreign currency forward contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	8,630	9,142
Asset Fair Value
Asset Fair Value	78	104
Liability Fair Value
Liability Fair Value	(63)	(117)
Non-qualifying Hedges | Foreign exchange spot contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	324	179
Liability Fair Value
Net fair value	1	0
Non-qualifying Hedges | Other contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Amount	1,145	983
Asset Fair Value
Asset Fair Value	8	6
Liability Fair Value
Liability Fair Value	$ (1)	$ (1)