FAIR VALUE MEASUREMENT - Level 3 Fair Value Rollforward Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Loans
Fair value, assets and liabilities measured on recurring basis, level 3 fair-value category disclosures
Transfers out of Level 3		$ (2,100)		$ (2,100)
Long-term debt
Fair value, assets and liabilities measured on recurring basis, level 3 fair-value category disclosures
Transfers into Level 3, liabilities	$ 3,335	3,937	$ 6,743	4,869
Transfers out of Level 3	$ 2,600	$ 6,000	3,500	6,000
Long-term debt | Option Volatility
Fair value, assets and liabilities measured on recurring basis, level 3 fair-value category disclosures
Transfers into Level 3, liabilities			4,500	4,000
Long-term debt | Equity Volatility
Fair value, assets and liabilities measured on recurring basis, level 3 fair-value category disclosures
Transfers into Level 3, liabilities			$ 2,200	$ 800