CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Change in accumulated other comprehensive income (loss), pretax
Balance at the beginning of the period, pretax	$ (28,846)		$ (25,892)		$ (25,334)		$ (25,807)
Change in net unrealized gains (losses) on investment securities, pretax	(114)		1,189		(3,090)		930
Cash flow hedges, pretax	514		294		1,519		512
Benefit plans, pretax	326		(33)		1,323		125
Foreign currency translation adjustment, pretax	432		1,016		(2,106)		814
Change, pretax	1,158		2,466		(2,354)		2,381
Balance at the end of the period, pretax	(27,688)		(23,426)		(27,688)		(23,426)
Change in accumulated other comprehensive income (loss), tax effect
Balance at the beginning of the period, tax effect	8,922		8,143		8,438		8,019
Change in net unrealized gains (losses) on investment securities, tax effect	48		(413)		1,137		(364)
Cash flow hedges, tax effect	(184)		(108)		(567)		(195)
Benefit plans, tax effect	(28)		9		(370)		(132)
Foreign currency translation adjustment, tax effect	132		229		252		532
Change, tax effect	(32)		(283)		452		(159)
Balance at the end of the period, tax effect	8,890		7,860		8,890		7,860
Change in accumulated other comprehensive income (loss), after-tax
Beginning-of-period balance, net of tax	(19,924)		(17,749)		(16,896)		(17,788)
Change in net unrealized gains (losses) on investment securities, after-tax	(66)		776		(1,953)		566
Cash flow hedges, after-tax	330		186		952		317
Benefit plans, after-tax	298	[1]	(24)	[1]	953	[1]	(7)	[1]
Foreign currency translation adjustment, after-tax	564		1,245		(1,854)		1,346
Change, after-tax	1,126		2,183		(1,902)		2,222
End-of-period balance, net of tax	$ (18,798)		$ (15,566)		$ (18,798)		$ (15,566)

[1] Primarily reflects adjustments based on the periodic actuarial valuations of the Company's benefit plans and amortization of amounts previously recognized in Other comprehensive income.