LOANS (Details 9) (Corporate, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Financing receivable impaired
Carrying Value	$ 65	$ 78
TDRs involving changes in the amount and/or timing of principal payments	41	77
TDRs involving changes in the amount and/or timing of interest payments	14
TDRs involving changes in the amount and/or timing of both principal and interest payments	10	1
Net P&L Impact		1
Carrying Value	901	963
TDR in payment default	15
Commercial and industrial
Financing receivable impaired
Carrying Value	47	17
TDRs involving changes in the amount and/or timing of principal payments	41	17
TDRs involving changes in the amount and/or timing of both principal and interest payments	6
Net P&L Impact		1
Carrying Value	311	272
TDR in payment default	15
Loans to financial institutions
Financing receivable impaired
Carrying Value	17	551
Mortgage and real estate
Financing receivable impaired
Carrying Value	14	61
TDRs involving changes in the amount and/or timing of principal payments		60
TDRs involving changes in the amount and/or timing of interest payments	14
TDRs involving changes in the amount and/or timing of both principal and interest payments		1
Carrying Value	136	120
Other
Financing receivable impaired
Carrying Value	4
TDRs involving changes in the amount and/or timing of both principal and interest payments	4
Carrying Value	$ 437	$ 20