DERIVATIVES ACTIVITIES - Fair Value Hedges (Details) - Other revenue - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	$ (1,739)	$ 562	$ 406	$ 835
Gain (loss) on the hedged item in designated and qualifying fair value hedges	1,718	(622)	(415)	(916)
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	(53)	(29)	(58)	(46)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	32	(31)	49	(35)
Interest rate contracts
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	(1,680)	344	(1,039)	608
Gain (loss) on the hedged item in designated and qualifying fair value hedges	1,606	(368)	998	(654)
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	(74)	(25)	(41)	(46)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	0	1	0	0
Foreign exchange contracts
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	16	321	1,404	330
Gain (loss) on the hedged item in designated and qualifying fair value hedges	36	(360)	(1,385)	(368)
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	21	(4)	(17)	0
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	31	(35)	36	(38)
Commodity and other contract options
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	(75)	(103)	41	(103)
Gain (loss) on the hedged item in designated and qualifying fair value hedges	76	106	(28)	106
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	$ 1	$ 3	$ 13	$ 3