LOANS (Details 4) (Consumer, USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 loan	Jun. 30, 2012 loan	Jun. 30, 2013 loan	Jun. 30, 2012 loan
Loans receivable
Number of days past due, default status			60 days
Commercial market loans
Loans receivable
Number of days past due, default status			90 days
In North America Offices
Loans receivable
Number of loans modified	60,732	83,829	129,541	194,042
Post-modification recorded investment	$ 1,569	$ 2,424	$ 3,230	$ 3,923
Deferred principal	14	3	20	9
Contingent principal forgiveness	2	2	2	4
Principal forgiveness	50	312	131	335
Loans in default	394	394	772	1,093
In North America Offices | Residential First Mortgage Loans
Loans receivable
Number of loans modified	9,085	10,523	18,252	16,724
Post-modification recorded investment	1,214	1,933	2,456	2,766
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	126		249
Deferred principal	14	2	19	6
Contingent principal forgiveness	2	2	2	4
Principal forgiveness	42	290	96	311
Average interest rate reduction (as a percent)	1.00%		2.00%	1.00%
Loans in default	271	210	512	650
In North America Offices | Residential First Mortgage Loans | New OCC guidance
Loans receivable
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	82		178
In North America Offices | Home equity loans
Loans receivable
Number of loans modified	2,504	2,240	5,501	4,885
Post-modification recorded investment	81	78	164	184
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	25		45
Deferred principal		1	1	3
Principal forgiveness	8	22	35	24
Average interest rate reduction (as a percent)	1.00%	2.00%	2.00%	3.00%
Loans in default	52	22	99	52
In North America Offices | Home equity loans | New OCC guidance
Loans receivable
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	22		38
In North America Offices | Credit cards
Loans receivable
Number of loans modified	36,785	55,757	79,761	137,110
Post-modification recorded investment	182	296	406	708
Average interest rate reduction (as a percent)	14.00%	16.00%	14.00%	16.00%
Loans in default	49	132	114	327
In North America Offices | Installment and other
Loans receivable
Number of loans modified	12,293	15,250	25,905	35,227
Post-modification recorded investment	87	112	185	259
Average interest rate reduction (as a percent)	7.00%	6.00%	7.00%	6.00%
Loans in default	20	30	45	64
In North America Offices | Commercial market loans
Loans receivable
Number of loans modified	65	59	122	96
Post-modification recorded investment	5	5	19	6
Loans in default	2		2
In offices outside North America
Loans receivable
Number of loans modified	43,623	50,541	91,038	106,472
Post-modification recorded investment	291	286	557	555
Deferred principal	1		1
Contingent principal forgiveness				1
Principal forgiveness	7	10	14	22
Loans in default	111	95	209	195
In offices outside North America | Residential First Mortgage Loans
Loans receivable
Number of loans modified	1,032	1,155	1,966	2,168
Post-modification recorded investment	48	39	85	76
Principal forgiveness	1	1	2	2
Average interest rate reduction (as a percent)	1.00%	1.00%	1.00%	1.00%
Loans in default	17	18	32	35
In offices outside North America | Home equity loans
Loans receivable
Number of loans modified	2		6	2
In offices outside North America | Credit cards
Loans receivable
Number of loans modified	29,674	34,453	61,972	72,728
Post-modification recorded investment	130	126	261	256
Principal forgiveness	4	6	8	14
Average interest rate reduction (as a percent)	17.00%	17.00%	17.00%	17.00%
Loans in default	58	49	108	103
In offices outside North America | Installment and other
Loans receivable
Number of loans modified	12,793	14,781	26,886	31,351
Post-modification recorded investment	77	84	165	167
Principal forgiveness	2	2	4	4
Average interest rate reduction (as a percent)	16.00%	17.00%	18.00%	17.00%
Loans in default	34	27	65	56
In offices outside North America | Commercial market loans
Loans receivable
Number of loans modified	122	152	208	223
Post-modification recorded investment	36	37	46	56
Deferred principal	1		1
Contingent principal forgiveness				1
Principal forgiveness		1		2
Loans in default	$ 2	$ 1	$ 4	$ 1