LOANS (Details 4) (Consumer, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 loan	Sep. 30, 2012 loan	Sep. 30, 2013 loan	Sep. 30, 2012 loan
Loans receivable
Period within which default occurred post-modification	1 year		1 year
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	67,573	126,027	197,400	319,964
Post-modification recorded investment	$ 1,335	$ 5,311	$ 4,566	$ 9,138
Deferred principal	28	8	46	21
Contingent principal forgiveness	15		17	3
Principal forgiveness	67	90	207	158
Loans in default	555	548	1,600	1,640
In North America Offices | Residential First Mortgage Loans
Loans receivable
Number of loans modified	7,375	36,382	25,757	52,937
Post-modification recorded investment	933	4,427	3,387	7,095
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	138	2,561	387
Deferred principal	28	6	45	17
Contingent principal forgiveness	15		17	3
Principal forgiveness	34	73	136	119
Average interest rate reduction (as a percent)	1.00%	1.00%	1.00%	1.00%
Loans in default	440	367	1,221	1,014
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	87	1,310	265
In North America Offices | Home equity loans
Loans receivable
Number of loans modified	2,962	23,523	8,588	28,472
Post-modification recorded investment	90	516	257	702
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	30	452	75
Deferred principal		2	1	4
Principal forgiveness	33	17	71	39
Average interest rate reduction (as a percent)	1.00%		1.00%	2.00%
Loans in default	51	46	154	99
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	24	385	62
In North America Offices | Credit cards
Loans receivable
Number of loans modified	43,312	51,304	123,073	188,414
Post-modification recorded investment	207	254	613	962
Average interest rate reduction (as a percent)	14.00%	15.00%	14.00%	16.00%
Loans in default	41	103	155	431
In North America Offices | Installment and other
Loans receivable
Number of loans modified	13,880	14,776	39,816	50,003
Post-modification recorded investment	99	107	284	366
Average interest rate reduction (as a percent)	6.00%	6.00%	7.00%	6.00%
Loans in default	22	32	67	96
In North America Offices | Commercial market loans
Loans receivable
Number of loans modified	44	42	166	138
Post-modification recorded investment	6	7	25	13
Loans in default	1		3
In offices outside North America
Loans receivable
Number of loans modified	50,868	50,344	140,470	157,710
Post-modification recorded investment	262	348	850	922
Deferred principal	1		2
Contingent principal forgiveness				2
Principal forgiveness	6	8	17	28
Loans in default	92	95	304	291
In offices outside North America | Residential First Mortgage Loans
Loans receivable
Number of loans modified	738	1,287	2,935	3,505
Post-modification recorded investment	30	46	137	133
Principal forgiveness	1	1	2	2
Average interest rate reduction (as a percent)	1.00%	1.00%	1.00%	1.00%
Loans in default	12	19	48	54
In offices outside North America | Home equity loans
Loans receivable
Number of loans modified	93	1	98	3
Post-modification recorded investment	1		1
Average interest rate reduction (as a percent)	1.00%
In offices outside North America | Credit cards
Loans receivable
Number of loans modified	37,299	33,535	98,264	106,003
Post-modification recorded investment	131	132	391	387
Principal forgiveness	3	5	9	18
Average interest rate reduction (as a percent)	16.00%	15.00%	16.00%	15.00%
Loans in default	51	48	165	155
In offices outside North America | Installment and other
Loans receivable
Number of loans modified	12,650	15,463	38,877	47,918
Post-modification recorded investment	70	97	245	273
Contingent principal forgiveness				1
Principal forgiveness	2	2	6	6
Average interest rate reduction (as a percent)	9.00%	7.00%	8.00%	8.00%
Loans in default	24	26	82	79
In offices outside North America | Commercial market loans
Loans receivable
Number of loans modified	88	58	296	281
Post-modification recorded investment	30	73	76	129
Deferred principal	1		2
Contingent principal forgiveness				1
Principal forgiveness				2
Loans in default	$ 5	$ 2	$ 9	$ 3