DERIVATIVES ACTIVITIES - Fair Value Hedges (Details) - Other revenue - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	$ 1,103	$ 2,145
Gain (loss) on the hedged item in designated and qualifying fair value hedges	(1,127)	(2,133)
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	(48)	(5)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	24	17
Interest rate contracts
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	2,115	641
Gain (loss) on the hedged item in designated and qualifying fair value hedges	(2,090)	(608)
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	27	33
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	(2)	0
Foreign exchange contracts
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	(1,361)	1,388
Gain (loss) on the hedged item in designated and qualifying fair value hedges	1,307	(1,421)
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	(75)	(38)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	21	5
Commodity and other contracts
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	349	116
Gain (loss) on the hedged item in designated and qualifying fair value hedges	(344)	(104)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	$ 5	$ 12