OTHER LIABILITIES, INCLUDING EMPLOYEE BENEFITS (Defined Contribution Plan) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items]
Liabilities	$ 23,476	$ 23,361
Other liabilities	2,269	2,491
Costs charged to operations for employee savings plans and defined contribution plans	40	85	$ 75
401K Plan
Defined Contribution Plan Disclosure [Line Items]
Liabilities	$ 49	$ 46