LOANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
LOANS
Number of loan categories	2		2
Loans
Loans, net of unearned income	$ 658,423		$ 658,423		$ 647,242
Consumer
Loans
Total loans	408,110		408,110		423,745
Net unearned income	(358)		(358)		(405)
Loans, net of unearned income	407,752		407,752		423,340
Loans sold and/or reclassified to held-for-sale	1,300	2,700	3,100	14,000
In U.S. offices | Consumer
Loans
Total loans	256,808		256,808		277,468
In U.S. offices | Consumer | Mortgage and real estate
Loans
Total loans	128,737		128,737		139,177
In U.S. offices | Consumer | Installment, revolving credit and other
Loans
Total loans	14,210		14,210		15,616
In U.S. offices | Consumer | Credit cards
Loans
Total loans	108,819		108,819		117,908
In U.S. offices | Consumer | Commercial and industrial
Loans
Total loans	5,042		5,042		4,766
In U.S. offices | Consumer | Lease financing
Loans
Total loans					1
In offices outside the U.S. | Consumer
Loans
Total loans	151,302		151,302		146,277
In offices outside the U.S. | Consumer | Mortgage and real estate
Loans
Total loans	54,529		54,529		52,052
In offices outside the U.S. | Consumer | Installment, revolving credit and other
Loans
Total loans	36,290		36,290		34,613
In offices outside the U.S. | Consumer | Credit cards
Loans
Total loans	39,671		39,671		38,926
In offices outside the U.S. | Consumer | Commercial and industrial
Loans
Total loans	20,070		20,070		19,975
In offices outside the U.S. | Consumer | Lease financing
Loans
Total loans	$ 742		$ 742		$ 711