PRINCIPAL TRANSACTIONS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Principal transactions revenue
Principal transactions revenue	$ 5,261	$ 2,804
Interest rate risks
Principal transactions revenue
Principal transactions revenue	1,977	1,718
Foreign exchange risks
Principal transactions revenue
Principal transactions revenue	995	473
Equity risks
Principal transactions revenue
Principal transactions revenue	819	456
Commodity and other risks
Principal transactions revenue
Principal transactions revenue	327	119
Credit products and risks
Principal transactions revenue
Principal transactions revenue	$ 1,143	$ 38