LOANS (Details 2) (USD $) In Millions, unless otherwise specified										3 Months Ended	12 Months Ended	3 Months Ended			3 Months Ended		3 Months Ended				3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Mar. 31, 2012 Loan to Values (LTVs)	Dec. 31, 2011 Loan to Values (LTVs)	Mar. 31, 2012 Residential First Mortgage Loans Loan to Values (LTVs)	Dec. 31, 2011 Residential First Mortgage Loans Loan to Values (LTVs)	Mar. 31, 2012 Home equity loans Loan to Values (LTVs)	Dec. 31, 2011 Home equity loans Loan to Values (LTVs)	Mar. 31, 2012 Consumer D	Dec. 31, 2011 Consumer D	Mar. 31, 2012 Consumer Consumer Credit Scores (FICOs) score	Mar. 31, 2012 Consumer Residential First Mortgage Loans D	Dec. 31, 2011 Consumer Residential First Mortgage Loans	Mar. 31, 2012 Consumer Home equity loans D	Dec. 31, 2011 Consumer Home equity loans	Mar. 31, 2012 Consumer Credit cards D	Dec. 31, 2011 Consumer Credit cards	Mar. 31, 2012 Consumer Installment and other	Dec. 31, 2011 Consumer Installment and other	Mar. 31, 2012 Consumer Commercial market loans D	Mar. 31, 2012 Consumer Special Asset Pool (SAP)	Dec. 31, 2011 Consumer Special Asset Pool (SAP)	Mar. 31, 2012 Consumer Total CGB and LCL	Dec. 31, 2011 Consumer Total CGB and LCL	Mar. 31, 2012 Consumer In North America Offices	Dec. 31, 2011 Consumer In North America Offices	Mar. 31, 2012 Consumer In North America Offices Residential First Mortgage Loans	Dec. 31, 2011 Consumer In North America Offices Residential First Mortgage Loans	Mar. 31, 2012 Consumer In North America Offices Home equity loans	Dec. 31, 2011 Consumer In North America Offices Home equity loans	Mar. 31, 2012 Consumer In North America Offices Credit cards	Dec. 31, 2011 Consumer In North America Offices Credit cards	Mar. 31, 2012 Consumer In North America Offices Installment and other	Dec. 31, 2011 Consumer In North America Offices Installment and other	Mar. 31, 2012 Consumer In North America Offices Commercial market loans	Dec. 31, 2011 Consumer In North America Offices Commercial market loans	Mar. 31, 2012 Consumer In offices outside North America	Dec. 31, 2011 Consumer In offices outside North America	Mar. 31, 2012 Consumer In offices outside North America Residential First Mortgage Loans	Dec. 31, 2011 Consumer In offices outside North America Residential First Mortgage Loans	Mar. 31, 2012 Consumer In offices outside North America Home equity loans	Dec. 31, 2011 Consumer In offices outside North America Home equity loans	Mar. 31, 2012 Consumer In offices outside North America Credit cards	Dec. 31, 2011 Consumer In offices outside North America Credit cards	Mar. 31, 2012 Consumer In offices outside North America Installment and other	Dec. 31, 2011 Consumer In offices outside North America Installment and other	Mar. 31, 2012 Consumer In offices outside North America Commercial market loans	Dec. 31, 2011 Consumer In offices outside North America Commercial market loans
Loans receivable
Recorded investment in loans										$ 392,020	$ 397,977											$ 730	$ 1,193	$ 391,290	$ 396,784	$ 248,778	$ 258,388	$ 80,290	$ 80,929	$ 40,224	$ 41,579	$ 106,724	$ 114,022	$ 14,571	$ 15,215	$ 6,969	$ 6,643	$ 142,512	$ 138,396	$ 44,972	$ 43,310	$ 6	$ 6	$ 37,643	$ 38,289	$ 28,311	$ 26,300	$ 31,580	$ 30,491
Loans, 30-89 days past due										8,334	9,249											10	29	8,324	9,220	6,144	7,117	3,166	3,550	750	868	1,940	2,344	279	340	9	15	2,180	2,103	581	566			971	930	553	528	75	79
Loans, greater than or equal to 90 days past due										9,184	9,428											45	47	9,139	9,381	7,488	7,788	4,269	4,273	928	1,028	1,890	2,058	227	222	174	207	1,651	1,593	502	482	2	2	801	785	203	197	143	127
Loans, Past due Government guaranteed										6,565	6,686													6,565	6,686	6,565	6,686	6,565	6,686
Total loans	648,022	647,242								416,103	423,340											785	1,269	415,318	422,071	268,975	279,979	94,290	95,438	41,902	43,475	110,554	118,424	15,077	15,777	7,152	6,865	146,343	142,092	46,055	44,358	8	8	39,415	40,004	29,067	27,025	31,798	30,697
Loans, total non-accrual										8,749	7,990											110	115	8,639	7,875	6,634	5,974	4,321	4,328	1,713	988			411	438	189	220	2,005	1,901	780	744	2	2	501	496	281	258	441	401
Loans, 90 days past due and accruing										7,545	7,626													7,545	7,626	7,029	7,136	5,120	5,054			1,890	2,058	8	10	11	14	516	490					516	490
Loans, 30-89 days past due, guaranteed by U.S. government-sponsored agencies																												1,300	1,600
Loans, greater than or equal to 90 days past due, guaranteed by U.S. government-sponsored agencies																												5,100	5,100
Loans less than this number of days past due are considered current										30	30
Loans at fair value	4,744	5,265	4,351							1,314	1,326		1,300	1,300
Delinquency status
Number of days past due, non-accrual status													90		90		180				90
Financing receivable, credit quality indicator
Consumer credit score, low end of the range												300
Consumer credit score, high end of the range												900
Consumer Loans Credit Quality Indicators, FICO score
Loan, credit score less than 620										40,003	40,165		19,723	20,370	6,529	6,385	9,120	9,621	4,631	3,789
Loan, credit score equal to or greater than 620 but less than 660										25,287	26,174		8,604	8,815	3,628	3,596	10,582	10,905	2,473	2,858
Loan, credit score equal to or greater than 660										174,378	184,166		52,727	52,839	29,717	31,389	86,349	93,234	5,585	6,704
Residential Mortgage Loan to Values
Loan, credit indicator ratio less than or equal to 80%				47,399	49,146	35,583	36,422	11,816	12,724
Loan, credit indicator ratio greater than 80% but less than or equal to 100%				29,586	31,378	20,160	21,146	9,426	10,232
Loan, credit indicator ratio greater than 100%				$ 43,757	$ 42,651	$ 25,293	$ 24,425	$ 18,464	$ 18,226