BASIS OF PRESENTATION, UPDATED ACCOUNTING POLICIES AND ACCOUNTING CHANGES - Accounting Changes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in interest expense	$ (1,420)	$ (676)	$ (2,291)	$ (1,388)
Increase in other operating expenses	2,820	$ 2,696	6,295	$ 5,410
Revision of Prior Period, Reclassification, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in interest expense	279
Increase in other operating expenses			$ 619
Macroeconomic Uncertainty
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) in allowance for credit losses	800
Change in Accounting Method Accounted for as Change in Estimate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) in allowance for credit losses	$ (300)