GOODWILL AND INTANGIBLE ASSETS (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	$ 15,363	$ 15,376
Accumulated amortization of Intangible assets (excluding MSRs)	8,950	8,776
Gross carrying amount of Mortgage servicing rights (MSRs)	2,691	2,569
Gross carrying amount of Intangible assets	18,054	17,945
Accumulated amortization of Intangible assets	8,950	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	(218)
FX and other	29
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	6,413
Net carrying amount of MSRs, balance at end of period	2,691
Net carrying amount of Intangible assets, balance at end of period	9,104
Purchased credit card relationships
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	7,646	7,616
Accumulated amortization of Intangible assets (excluding MSRs)	5,436	5,309
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	2,307
Amortization	(102)
FX and other	5
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	2,210
Core deposit intangibles
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	1,317	1,337
Accumulated amortization of Intangible assets (excluding MSRs)	957	965
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	372
Amortization	(21)
FX and other	9
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	360
Other customer relationships
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	790	830
Accumulated amortization of Intangible assets (excluding MSRs)	351	356
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	474
Amortization	(11)
FX and other	(24)
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)	128	123
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	112
Amortization	(2)
FX and other	1
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	111
Indefinite-lived intangible assets
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	520	492
Finite and indefinite-lived intangible assets:
Net carrying amount of Intangible assets (excluding MSRs), balance at beginning of period	492
FX and other	28
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	520
Other:
Finite and indefinite-lived intangible assets.
Gross carrying amount of Intangible assets (excluding MSRs)	4,851	4,866
Accumulated amortization of Intangible assets (excluding MSRs)	2,078	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	(82)
FX and other	10
Net carrying amount of Intangible assets (excluding MSRs), balance at end of period	$ 2,773