FAIR VALUE MEASUREMENT - Level 3 Roll Forward Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Long-term debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers into Level 3	$ 4,900	$ 9,900
Transfers into Level 3, liabilities	4,913	9,873
Transfers out of Level 3, assets	10,200	7,600
Long-term debt | Measurement Input, Option Volatility
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers into Level 3, liabilities	4,200	7,000
Long-term debt | Equity volatility
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers into Level 3, liabilities	600	2,900
Trading account assets and liabilities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers into Level 3	185	(774)
Transfers out of Level 3, assets	(974)	726
Trading account assets and liabilities | Equity contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers into Level 3	32	(572)
Transfers out of Level 3, assets	$ (858)	$ (673)