LOANS (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Loans receivable
Number of days past due, default status	60 days	60 days	60 days	60 days
Consumer | Commercial market loans
Loans receivable
Number of days past due, default status	90 days	90 days	90 days	90 days
Consumer | In North America Offices
Loans receivable
Number of loans modified	118,458	181,344	287,857	628,907
Post-modification recorded investment	4,754	2,414	8,273	8,594
Chapter 7 bankruptcy	635		635
Deferred principal	3		12	73
Contingent principal forgiveness		10	2	46
Principal forgiveness	74		439	1
Loans in default	374	798	1,422	2,539
Consumer | In North America Offices | Residential First Mortgage Loans
Loans receivable
Number of loans modified	33,751	7,448	47,567	26,823
Post-modification recorded investment	3,905	1,187	6,365	4,224
Chapter 7 bankruptcy	181		181
Deferred principal	2		8	57
Contingent principal forgiveness		10	2	45
Principal forgiveness	66		405
Average interest rate reduction (as a percent)	1.00%	2.00%	2.00%	2.00%
Loans in default	240	448	893	1,303
Consumer | In North America Offices | Residential First Mortgage Loans | New OCC guidance
Loans receivable
Post-modification recorded investment	1,327		1,327
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankcruptcy	2,797		2,797
Consumer | In North America Offices | Home equity loans
Loans receivable
Number of loans modified	23,728	3,770	28,584	14,521
Post-modification recorded investment	507	195	689	759
Chapter 7 bankruptcy	454		454
Deferred principal	1		4	16
Contingent principal forgiveness				1
Principal forgiveness	8		34
Average interest rate reduction (as a percent)		4.00%	2.00%	4.00%
Loans in default	21	30	73	82
Consumer | In North America Offices | Home equity loans | New OCC guidance
Loans receivable
Post-modification recorded investment	387		387
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankcruptcy	473		473
Consumer | In North America Offices | Credit cards
Loans receivable
Number of loans modified	46,178	146,783	161,577	509,214
Post-modification recorded investment	229	853	841	2,976
Average interest rate reduction (as a percent)	16.00%	19.00%	17.00%	19.00%
Loans in default	82	284	362	1,077
Consumer | In North America Offices | Installment and other
Loans receivable
Number of loans modified	14,759	23,289	49,991	77,858
Post-modification recorded investment	106	173	365	586
Average interest rate reduction (as a percent)	6.00%	4.00%	6.00%	4.00%
Loans in default	31	35	94	75
Consumer | In North America Offices | Commercial market loans
Loans receivable
Number of loans modified	42	54	138	491
Post-modification recorded investment	7	6	13	49
Principal forgiveness				1
Loans in default		1		2
Consumer | In offices outside North America
Loans receivable
Number of loans modified	63,101	83,843	194,952	293,695
Post-modification recorded investment	352	379	975	1,227
Contingent principal forgiveness			1
Principal forgiveness	1	2	6	15
Loans in default	91	152	290	567
Consumer | In offices outside North America | Residential First Mortgage Loans
Loans receivable
Number of loans modified	1,078	2,283	4,113	5,987
Post-modification recorded investment	55	78	176	242
Principal forgiveness	1	1	2	5
Average interest rate reduction (as a percent)	1.00%	1.00%	1.00%	1.00%
Loans in default	12	27	42	96
Consumer | In offices outside North America | Home equity loans
Loans receivable
Number of loans modified	9	10	39	49
Post-modification recorded investment	1	1	3	3
Loans in default				2
Consumer | In offices outside North America | Credit cards
Loans receivable
Number of loans modified	51,149	48,800	156,477	172,582
Post-modification recorded investment	162	142	465	475
Principal forgiveness			1	2
Average interest rate reduction (as a percent)	28.00%	26.00%	29.00%	23.00%
Loans in default	52	70	155	265
Consumer | In offices outside North America | Installment and other
Loans receivable
Number of loans modified	10,807	32,716	34,042	115,034
Post-modification recorded investment	61	128	202	459
Principal forgiveness		1	1	8
Average interest rate reduction (as a percent)	34.00%	12.00%	23.00%	11.00%
Loans in default	25	47	90	193
Consumer | In offices outside North America | Commercial market loans
Loans receivable
Number of loans modified	58	34	281	43
Post-modification recorded investment	73	30	129	48
Contingent principal forgiveness			1
Principal forgiveness			2
Loans in default	2	8	3	11