LOANS (Details 4) (Consumer, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 loan	Mar. 31, 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	65,518	94,095
Post-modification recorded investment	$ 1,648	$ 1,425
Deferred principal	5	6
Contingent principal forgiveness		2
Principal forgiveness	81	23
Loans in default	359	668
In North America Offices | Residential First Mortgage Loans
Loans receivable
Number of loans modified	9,304	6,201
Post-modification recorded investment	1,244	828
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	123
Deferred principal	5	4
Contingent principal forgiveness		2
Principal forgiveness	54	21
Average interest rate reduction (as a percent)	2.00%	2.00%
Loans in default	236	439
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	97
In North America Offices | Home equity loans
Loans receivable
Number of loans modified	3,093	2,645
Post-modification recorded investment	87	106
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	20
Deferred principal		2
Principal forgiveness	27	2
Average interest rate reduction (as a percent)	2.00%	4.00%
Loans in default	42	30
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	16
In North America Offices | Credit cards
Loans receivable
Number of loans modified	39,469	65,236
Post-modification recorded investment	205	345
Average interest rate reduction (as a percent)	16.00%	17.00%
Loans in default	62	165
In North America Offices | Installment and other
Loans receivable
Number of loans modified	13,595	19,978
Post-modification recorded investment	98	146
Average interest rate reduction (as a percent)	6.00%	5.00%
Loans in default	19	34
In North America Offices | Commercial market loans
Loans receivable
Number of loans modified	57	35
Post-modification recorded investment	14
In offices outside North America
Loans receivable
Number of loans modified	62,784	68,822
Post-modification recorded investment	309	298
Principal forgiveness	3	2
Loans in default	107	104
In offices outside North America | Residential First Mortgage Loans
Loans receivable
Number of loans modified	1,594	1,454
Post-modification recorded investment	60	51
Principal forgiveness	1	1
Average interest rate reduction (as a percent)	1.00%	1.00%
Loans in default	16	15
In offices outside North America | Home equity loans
Loans receivable
Number of loans modified	4	2
In offices outside North America | Credit cards
Loans receivable
Number of loans modified	49,339	53,592
Post-modification recorded investment	159	153
Principal forgiveness	2
Average interest rate reduction (as a percent)	35.00%	29.00%
Loans in default	57	53
In offices outside North America | Installment and other
Loans receivable
Number of loans modified	11,761	13,754
Post-modification recorded investment	80	94
Average interest rate reduction (as a percent)	19.00%	15.00%
Loans in default	32	36
In offices outside North America | Commercial market loans
Loans receivable
Number of loans modified	86	20
Post-modification recorded investment	10
Principal forgiveness		1
Loans in default	$ 2