LOANS (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 D	Jun. 30, 2011 D	Jun. 30, 2012 D	Jun. 30, 2011 D
Loans receivable
Number of days past due, default status (in days)	60	60	60	60
Consumer | Commercial market loans
Loans receivable
Number of days past due, default status (in days)	90	90	90	90
Consumer | In North America Offices
Loans receivable
Number of loans modified	76,466	188,529	169,126	447,413
Post-modification recorded investment	2,280	2,646	3,517	6,165
Deferred principal	3	19	9	73
Contingent principal forgiveness		22	2	37
Principal forgiveness	342		365
Loans in default	378	769	1,047	1,740
Consumer | In North America Offices | Residential First Mortgage Loans
Loans receivable
Number of loans modified	8,890	9,088	13,816	19,375
Post-modification recorded investment	1,819	1,383	2,459	3,037
Deferred principal	2	16	6	57
Contingent principal forgiveness		22	2	36
Principal forgiveness	318		339
Average interest rate reduction (as a percent)	2.00%	2.00%	2.00%	2.00%
Loans in default	212	398	653	856
Consumer | In North America Offices | Home equity loans
Loans receivable
Number of loans modified	2,212	4,113	4,856	10,751
Post-modification recorded investment	76	199	182	564
Deferred principal	1	3	3	16
Contingent principal forgiveness				1
Principal forgiveness	24		26
Average interest rate reduction (as a percent)	2.00%	4.00%	3.00%	4.00%
Loans in default	22	27	52	52
Consumer | In North America Offices | Credit cards
Loans receivable
Number of loans modified	50,163	150,550	115,399	362,431
Post-modification recorded investment	268	870	613	2,122
Average interest rate reduction (as a percent)	17.00%	19.00%	17.00%	19.00%
Loans in default	115	323	280	792
Consumer | In North America Offices | Installment and other
Loans receivable
Number of loans modified	15,142	24,642	34,959	54,422
Post-modification recorded investment	112	184	257	411
Average interest rate reduction (as a percent)	6.00%	4.00%	6.00%	4.00%
Loans in default	29	21	62	40
Consumer | In North America Offices | Commercial market loans
Loans receivable
Number of loans modified	59	136	96	434
Post-modification recorded investment	5	10	6	31
Consumer | In offices outside North America
Loans receivable
Number of loans modified	63,517	100,587	130,095	211,820
Post-modification recorded investment	281	366	560	791
Contingent principal forgiveness			1
Principal forgiveness	2	5	4	11
Loans in default	131	207	231	440
Consumer | In offices outside North America | Residential First Mortgage Loans
Loans receivable
Number of loans modified	557	1,079	1,145	2,552
Post-modification recorded investment	33	58	66	127
Principal forgiveness	1	2	1	3
Average interest rate reduction (as a percent)	1.00%	1.00%	1.00%	1.00%
Loans in default	9	28	19	64
Consumer | In offices outside North America | Home equity loans
Loans receivable
Number of loans modified	14	20	30	39
Post-modification recorded investment	1	1	2	2
Loans in default		1		2
Consumer | In offices outside North America | Credit cards
Loans receivable
Number of loans modified	51,804	55,672	105,448	126,493
Post-modification recorded investment	148	147	298	332
Principal forgiveness				1
Average interest rate reduction (as a percent)	31.00%	23.00%	30.00%	21.00%
Loans in default	93	105	146	219
Consumer | In offices outside North America | Installment and other
Loans receivable
Number of loans modified	10,990	43,810	23,249	82,727
Post-modification recorded investment	62	160	138	330
Principal forgiveness		3	1	7
Average interest rate reduction (as a percent)	19.00%	12.00%	18.00%	10.00%
Loans in default	28	73	65	155
Consumer | In offices outside North America | Commercial market loans
Loans receivable
Number of loans modified	152	6	223	9
Post-modification recorded investment	37		56
Contingent principal forgiveness			1
Principal forgiveness	1		2
Loans in default	1		1