LOANS (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Loans receivable
Loans at fair value	$ 5,359		$ 5,359		$ 5,265
Loans, net of unearned income	658,423		658,423		647,242
Corporate
Loans receivable
Loans sold and/or reclassified to held-for-sale	745	1,067	2,384	4,736
Number of days past due for reversal of accrued interest and charging to earnings			90 days	90 days	90 days
Loans, equal to 30- 89 days past due and accruing	355		355		545
Loans, greater than or equal to 90 days past due and accruing	131		131		183
Loans, total Past due and accruing	486		486		728
Loans, total non-accrual	2,429		2,429		3,236
Loans, total current	243,653		243,653		215,999
Loans at fair value	4,103		4,103		3,939
Loans, net of unearned income	250,671		250,671		223,902
Number of days past due, non-accrual status	90 days	90 days	90 days	90 days	90 days
Loans less than this number of days past due are considered current	30 days	30 days	30 days	30 days	30 days
Corporate | Commercial and industrial
Loans receivable
Loans, equal to 30- 89 days past due and accruing	48		48		93
Loans, greater than or equal to 90 days past due and accruing	16		16		30
Loans, total Past due and accruing	64		64		123
Loans, total non-accrual	974		974		1,134
Loans, total current	113,854		113,854		98,157
Loans, net of unearned income	114,892		114,892		99,414
Corporate | Loans to financial institutions
Loans receivable
Loans, greater than or equal to 90 days past due and accruing					2
Loans, total Past due and accruing					2
Loans, total non-accrual	465		465		763
Loans, total current	50,111		50,111		42,642
Loans, net of unearned income	50,576		50,576		43,407
Corporate | Mortgage and real estate
Loans receivable
Loans, equal to 30- 89 days past due and accruing	207		207		224
Loans, greater than or equal to 90 days past due and accruing	109		109		125
Loans, total Past due and accruing	316		316		349
Loans, total non-accrual	841		841		1,039
Loans, total current	29,167		29,167		26,908
Loans, net of unearned income	30,324		30,324		28,296
Corporate | Lease financing
Loans receivable
Loans, equal to 30- 89 days past due and accruing	4		4		3
Loans, greater than or equal to 90 days past due and accruing					11
Loans, total Past due and accruing	4		4		14
Loans, total non-accrual	6		6		13
Loans, total current	1,958		1,958		1,811
Loans, net of unearned income	1,968		1,968		1,838
Corporate | Other
Loans receivable
Loans, equal to 30- 89 days past due and accruing	96		96		225
Loans, greater than or equal to 90 days past due and accruing	6		6		15
Loans, total Past due and accruing	102		102		240
Loans, total non-accrual	143		143		287
Loans, total current	48,563		48,563		46,481
Loans, net of unearned income	$ 48,808		$ 48,808		$ 47,008