LOANS (Details 4) (Consumer, USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011 D	Sep. 30, 2011 D
Financing receivable
Number of days past due, default status (in days)	60	60
Credit cards | In North America Offices
Financing receivable
Number of loans modified	146,783	509,214
Pre-modification recorded investment	$ 853	$ 2,981
Post-modification recorded investment	853	2,976
Average interest rate reduction	19.00%	19.00%
TDR loans in default	220	1,012
Credit cards | In offices outside North America
Financing receivable
Number of loans modified	51,089	177,309
Pre-modification recorded investment	140	477
Post-modification recorded investment	138	469
Principal forgiveness		1
Average interest rate reduction	24.00%	23.00%
TDR loans in default	65	255
In North America Offices
Financing receivable
Number of loans modified	170,014	598,639
Pre-modification recorded investment	2,192	8,002
Post-modification recorded investment	2,244	8,201
Deferred principal		123
Contingent principal forgiveness		46
Principal forgiveness		1
TDR loans in default	750	2,463
In North America Offices | Residential First Mortgage Loans
Financing receivable
Number of loans modified	6,392	23,934
Pre-modification recorded investment	1,071	3,915
Post-modification recorded investment	1,125	4,144
Deferred principal	25	102
Contingent principal forgiveness	9	45
Average interest rate reduction	2.00%	2.00%
TDR loans in default	489	1,368
In North America Offices | Home equity loans
Financing receivable
Number of loans modified	2,817	11,926
Pre-modification recorded investment	161	662
Post-modification recorded investment	165	686
Deferred principal	2	21
Contingent principal forgiveness		1
Average interest rate reduction	4.00%	4.00%
TDR loans in default	15	29
In North America Offices | Installment and other
Financing receivable
Number of loans modified	13,968	53,074
Pre-modification recorded investment	101	395
Post-modification recorded investment	101	395
Average interest rate reduction	4.00%	4.00%
TDR loans in default	25	52
In North America Offices | Commercial market loans
Financing receivable
Number of loans modified	54	491
Pre-modification recorded investment	6	49
Principal forgiveness		1
TDR loans in default	1	2
In offices outside North America
Financing receivable
Number of loans modified	77,491	253,088
Pre-modification recorded investment	344	1,114
Post-modification recorded investment	308	1,037
Principal forgiveness	2	14
TDR loans in default	133	534
In offices outside North America | Residential First Mortgage Loans
Financing receivable
Number of loans modified	1,028	3,392
Pre-modification recorded investment	60	186
Post-modification recorded investment	58	180
Principal forgiveness	1	5
Average interest rate reduction	1.00%	1.00%
TDR loans in default	15	65
In offices outside North America | Home equity loans
Financing receivable
Number of loans modified	10	50
Pre-modification recorded investment	1	3
Post-modification recorded investment	1	3
TDR loans in default		2
In offices outside North America | Installment and other
Financing receivable
Number of loans modified	25,330	72,294
Pre-modification recorded investment	113	400
Post-modification recorded investment	111	385
Principal forgiveness	1	8
Average interest rate reduction	13.00%	12.00%
TDR loans in default	45	201
In offices outside North America | Commercial market loans
Financing receivable
Number of loans modified	34	43
Pre-modification recorded investment	30	48
TDR loans in default	$ 8	$ 11
Commercial market loans
Financing receivable
Number of days past due, default status (in days)	90	90