GOODWILL AND INTANGIBLE ASSETS (Details 3) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	$ 14,784	$ 15,204
Accumulated amortization of Intangible assets (excluding MSRs)	9,896	9,507
Gross carrying amount of Mortgage servicing rights (MSRs)	2,580	1,942
Gross carrying amount of Intangible assets	17,364	17,146
Accumulated amortization of Intangible assets	9,896	9,507
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	5,697
Net carrying amount of MSRs, balance at beginning of period	1,942
Net carrying amount of Intangible assets, balance at beginning of period	7,639
Acquisitions/divestitures	102
Amortization	(604)
Impairments	(25)
FX and other	(77)
Discontinued Operations	(205)
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	4,888
Net carrying amount of MSRs, balance at end of period	2,580
Net carrying amount of Intangible assets, balance at end of period	7,468
Purchased credit card relationships
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	7,550	7,632
Accumulated amortization of Intangible assets (excluding MSRs)	5,913	5,726
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	1,906
Acquisitions/divestitures	36
Amortization	(283)
Impairments	(4)
FX and other	(4)
Discontinued Operations	(14)
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	1,637
Core deposit intangibles
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	1,250	1,315
Accumulated amortization of Intangible assets (excluding MSRs)	1,030	1,019
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	296
Amortization	(54)
Impairments	(21)
FX and other	(1)
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	220
Other customer relationships
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	706	767
Accumulated amortization of Intangible assets (excluding MSRs)	389	380
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	387
Amortization	(27)
FX and other	(43)
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	317
Present value of future profits
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	238	239
Accumulated amortization of Intangible assets (excluding MSRs)	144	135
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	104
Amortization	(9)
FX and other	(1)
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	94
Other:
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	4,716	4,764
Accumulated amortization of Intangible assets (excluding MSRs)	2,420	2,247
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	2,517
Acquisitions/divestitures	66
Amortization	(231)
FX and other	(27)
Discontinued Operations	(29)
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	2,296
Indefinite-lived intangible assets
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	324	487
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	487
FX and other	(1)
Discontinued Operations	(162)
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	$ 324