LOANS (Details 2) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Financing receivable
Consumer	$ 443,044,000,000	$ 457,632,000,000
Loans at fair value	4,840,000,000	4,372,000,000
Consumer
Financing receivable
Loans, 30-89 days past due	10,496,000,000
Loans, greater than or equal to 90 days past due	9,903,000,000
Loans, 90 days past due and accruing	7,877,000,000
Loans, total non-accrual	8,414,000,000
Loans, total current	414,436,000,000
Total loans	443,167,000,000	457,563,000,000
Consumer	441,492,000,000	457,632,000,000
Loans less than this number of days past due are considered current (in days)	30	30
Consumer Loans Credit Quality Indicators, FICO score
Loan, credit score less than 620	47,076,000,000	61,986,000,000
Loan, credit score equal to or greater than 620 but less than 660	27,286,000,000	28,860,000,000
Loan, credit score equal to or greater than 660	181,802,000,000	183,027,000,000
Consumer | Credit cards
Consumer Loans Credit Quality Indicators, FICO score
Loan, credit score less than 620	10,318,000,000	18,341,000,000
Loan, credit score equal to or greater than 620 but less than 660	10,758,000,000	12,592,000,000
Loan, credit score equal to or greater than 660	89,299,000,000	88,332,000,000
Consumer | Credit cards | In North America Offices
Financing receivable
Loans, 30-89 days past due	2,586,000,000	3,290,000,000
Loans, greater than or equal to 90 days past due	2,285,000,000	3,207,000,000
Loans, 90 days past due and accruing	2,285,000,000	3,207,000,000
Loans, total current	110,682,000,000	117,496,000,000
Total loans	115,553,000,000	123,993,000,000
Consumer | Credit cards | In offices outside North America
Financing receivable
Loans, 30-89 days past due	1,065,000,000	1,116,000,000
Loans, greater than or equal to 90 days past due	903,000,000	974,000,000
Loans, 90 days past due and accruing	567,000,000	409,000,000
Loans, total non-accrual	572,000,000	564,000,000
Loans, total current	39,598,000,000	40,806,000,000
Total loans	41,566,000,000	42,896,000,000
Consumer | In North America Offices
Financing receivable
Loans, 30-89 days past due	7,996,000,000	10,410,000,000
Loans, greater than or equal to 90 days past due	7,989,000,000	11,437,000,000
Loans, 90 days past due and accruing	7,295,000,000	8,956,000,000
Loans, total non-accrual	6,125,000,000	8,540,000,000
Loans, total current	267,050,000,000	282,524,000,000
Total loans	289,692,000,000	311,374,000,000
Consumer | In North America Offices | Residential First Mortgage Loans
Financing receivable
Loans, 30-89 days past due	3,585,000,000	4,311,000,000
Loans, greater than or equal to 90 days past due	4,080,000,000	5,668,000,000
Loans, 90 days past due and accruing	4,986,000,000	5,405,000,000
Loans, total non-accrual	4,085,000,000	5,679,000,000
Loans, total current	82,458,000,000	81,597,000,000
Total loans	96,780,000,000	98,579,000,000
Loans, 30-89 days past due, guaranteed by U.S. government-sponsored agencies	1,700,000,000	1,600,000,000
Loans, greater than or equal to 90 days past due, guaranteed by U.S. government-sponsored agencies	5,000,000,000	5,400,000,000
Consumer | In North America Offices | Home equity loans
Financing receivable
Loans, 30-89 days past due	902,000,000	1,137,000,000
Loans, greater than or equal to 90 days past due	1,053,000,000	1,279,000,000
Loans, total non-accrual	996,000,000	1,273,000,000
Loans, total current	44,469,000,000	43,814,000,000
Total loans	46,424,000,000	46,230,000,000
Consumer | In North America Offices | Installment and other
Financing receivable
Loans, 30-89 days past due	889,000,000	1,500,000,000
Loans, greater than or equal to 90 days past due	420,000,000	1,126,000,000
Loans, 90 days past due and accruing	16,000,000	344,000,000
Loans, total non-accrual	782,000,000	1,014,000,000
Loans, total current	22,623,000,000	29,665,000,000
Total loans	23,932,000,000	32,291,000,000
Consumer | In North America Offices | Commercial market loans
Financing receivable
Loans, 30-89 days past due	34,000,000	172,000,000
Loans, greater than or equal to 90 days past due	151,000,000	157,000,000
Loans, 90 days past due and accruing	8,000,000
Loans, total non-accrual	262,000,000	574,000,000
Loans, total current	6,818,000,000	9,952,000,000
Total loans	7,003,000,000	10,281,000,000
Consumer | In North America Offices | Consumer loans in SAP
Financing receivable
Total loans	1,600,000
Consumer | In offices outside North America
Financing receivable
Loans, 30-89 days past due	2,500,000,000	2,659,000,000
Loans, greater than or equal to 90 days past due	1,914,000,000	2,028,000,000
Loans, 90 days past due and accruing	582,000,000	451,000,000
Loans, total non-accrual	2,289,000,000	2,257,000,000
Loans, total current	147,386,000,000	141,571,000,000
Total loans	151,800,000,000	146,258,000,000
Consumer | In offices outside North America | Residential First Mortgage Loans
Financing receivable
Loans, 30-89 days past due	587,000,000	657,000,000
Loans, greater than or equal to 90 days past due	560,000,000	573,000,000
Loans, total non-accrual	787,000,000	774,000,000
Loans, total current	44,066,000,000	41,852,000,000
Total loans	45,213,000,000	43,082,000,000
Consumer | In offices outside North America | Home equity loans
Financing receivable
Loans, 30-89 days past due		2,000,000
Loans, greater than or equal to 90 days past due	1,000,000	4,000,000
Loans, total non-accrual	2,000,000	6,000,000
Loans, total current	9,000,000	188,000,000
Total loans	10,000,000	194,000,000
Consumer | In offices outside North America | Installment and other
Financing receivable
Loans, 30-89 days past due	771,000,000	823,000,000
Loans, greater than or equal to 90 days past due	289,000,000	291,000,000
Loans, 90 days past due and accruing	15,000,000	41,000,000
Loans, total non-accrual	659,000,000	635,000,000
Loans, total current	31,654,000,000	30,790,000,000
Total loans	32,714,000,000	31,904,000,000
Consumer | In offices outside North America | Commercial market loans
Financing receivable
Loans, 30-89 days past due	77,000,000	61,000,000
Loans, greater than or equal to 90 days past due	161,000,000	186,000,000
Loans, 90 days past due and accruing		1,000,000
Loans, total non-accrual	269,000,000	278,000,000
Loans, total current	32,059,000,000	27,935,000,000
Total loans	32,297,000,000	28,182,000,000
Consumer | Residential First Mortgage Loans
Financing receivable
Loans at fair value	1,400,000,000	1,700,000,000
Consumer Loans Credit Quality Indicators, FICO score
Loan, credit score less than 620	21,790,000,000	24,794,000,000
Loan, credit score equal to or greater than 620 but less than 660	8,932,000,000	9,095,000,000
Loan, credit score equal to or greater than 660	51,486,000,000	50,589,000,000
Consumer | Home equity loans
Consumer Loans Credit Quality Indicators, FICO score
Loan, credit score less than 620	7,780,000,000	7,531,000,000
Loan, credit score equal to or greater than 620 but less than 660	4,014,000,000	3,413,000,000
Loan, credit score equal to or greater than 660	30,947,000,000	33,363,000,000
Consumer | Consumer Credit Scores (FICOs)
Financing receivable, credit quality indicator
Consumer credit score, low end of the range	300
Consumer credit score, high end of the range	900
Consumer | Installment and other
Consumer Loans Credit Quality Indicators, FICO score
Loan, credit score less than 620	7,188,000,000	11,320,000,000
Loan, credit score equal to or greater than 620 but less than 660	3,582,000,000	3,760,000,000
Loan, credit score equal to or greater than 660	10,070,000,000	10,743,000,000
Consumer | Commercial market loans
Delinquency status
Number of days past due, non-accrual status (in days)	90
Consumer | Installment Loans
Delinquency status
Number of days past due, non-accrual status (in days)	90
Consumer | Unsecured Revolving Loans
Delinquency status
Number of days past due, non-accrual status (in days)	180
Residential First Mortgage Loans | Loan to Values (LTVs)
Residential Mortgage Loan to Values
Loan, credit indicator ratio less than or equal to 80%	33,772,000,000	32,408,000,000
Loan, credit indicator ratio greater than 80% but less than or equal to 100%	22,601,000,000	25,311,000,000
Loan, credit indicator ratio greater than 100%	25,800,000,000	26,636,000,000
Home equity loans | Loan to Values (LTVs)
Residential Mortgage Loan to Values
Loan, credit indicator ratio less than or equal to 80%	11,897,000,000	12,698,000,000
Loan, credit indicator ratio greater than 80% but less than or equal to 100%	11,260,000,000	10,940,000,000
Loan, credit indicator ratio greater than 100%	19,439,000,000	20,670,000,000
Loan to Values (LTVs)
Residential Mortgage Loan to Values
Loan, credit indicator ratio less than or equal to 80%	45,669,000,000	45,106,000,000
Loan, credit indicator ratio greater than 80% but less than or equal to 100%	33,861,000,000	36,251,000,000
Loan, credit indicator ratio greater than 100%	$ 45,239,000,000	$ 47,306,000,000