GOODWILL AND INTANGIBLE ASSETS (Details 3) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	$ 15,331	$ 15,376
Accumulated amortization of Intangible assets (excluding MSRs)	9,368	8,776
Gross carrying amount of Mortgage servicing rights (MSRs)	1,920	2,569
Gross carrying amount of Intangible assets	17,251	17,945
Accumulated amortization of Intangible assets	9,368	8,776
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	6,600
Net carrying amount of MSRs, balance at beginning of period	2,569
Net carrying amount of Intangible assets, balance at beginning of period	9,169
Acquisitions/divestitures	2
Amortization	(648)
Impairments	(1)
FX and other	30
Discontinued Operations	(20)
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	5,963
Net carrying amount of MSRs, balance at end of period	1,920
Net carrying amount of Intangible assets, balance at end of period	7,883
Purchased credit card relationships
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	7,633	7,616
Accumulated amortization of Intangible assets (excluding MSRs)	5,628	5,309
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	2,307
Amortization	(303)
FX and other	1
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	2,005
Core deposit intangibles
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	1,314	1,337
Accumulated amortization of Intangible assets (excluding MSRs)	997	965
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	372
Amortization	(63)
FX and other	8
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	317
Other customer relationships
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	821	830
Accumulated amortization of Intangible assets (excluding MSRs)	382	356
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	474
Amortization	(34)
FX and other	(1)
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	439
Present value of future profits
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	239	235
Accumulated amortization of Intangible assets (excluding MSRs)	133	123
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	112
Amortization	(7)
FX and other	1
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	106
Indefinite-lived intangible assets
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	499	492
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	492
FX and other	7
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	499
Other:
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	4,825	4,866
Accumulated amortization of Intangible assets (excluding MSRs)	2,228	2,023
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	2,843
Acquisitions/divestitures	2
Amortization	(241)
Impairments	(1)
FX and other	14
Discontinued Operations	(20)
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	$ 2,597