DERIVATIVES ACTIVITIES - Fair Value Hedges (Details) - Other revenue - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	$ 690	$ 497	$ 1,096	$ 1,332
Gain (loss) on the hedged item in designated and qualifying fair value hedges	(700)	(438)	(1,115)	(1,354)
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	(25)	33	(83)	(13)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	15	26	64	(9)
Interest rate contracts
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	1,111	(330)	72	278
Gain (loss) on the hedged item in designated and qualifying fair value hedges	(1,113)	371	(115)	(283)
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	(1)	44	(42)	(2)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	(1)	(3)	(1)	(3)
Foreign exchange contracts
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	(311)	780	1,093	1,110
Gain (loss) on the hedged item in designated and qualifying fair value hedges	304	(789)	(1,081)	(1,157)
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	(24)	(11)	(41)	(11)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	17	2	53	(36)
Commodity and other contract options
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	(110)	47	(69)	(56)
Gain (loss) on the hedged item in designated and qualifying fair value hedges	109	(20)	81	86
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	$ (1)	$ 27	$ 12	$ 30