LOANS (Details 2) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012 D	Jun. 30, 2012 D	Dec. 31, 2011 D
Loans receivable
Loans, net of unearned income	$ 654,968,000,000	$ 654,968,000,000	$ 647,242,000,000
Loans at fair value	5,089,000,000	5,089,000,000	5,265,000,000
Residential First Mortgage Loans | Loan to Values (LTVs)
Residential Mortgage Loan to Values
Loan, credit indicator ratio less than or equal to 80%	37,631,000,000	37,631,000,000	36,422,000,000
Loan, credit indicator ratio greater than 80% but less than or equal to 100%	20,040,000,000	20,040,000,000	21,146,000,000
Loan, credit indicator ratio greater than 100%	21,408,000,000	21,408,000,000	24,425,000,000
Residential First Mortgage Loans | Consumer Credit Scores (FICOs)
Consumer Loans Credit Quality Indicators, FICO score
Loan, credit score less than 620	18,410,000,000	18,410,000,000	20,370,000,000
Loan, credit score equal to or greater than 620 but less than 660	8,539,000,000	8,539,000,000	8,815,000,000
Loan, credit score equal to or greater than 660	52,116,000,000	52,116,000,000	52,839,000,000
Home equity loans | Loan to Values (LTVs)
Residential Mortgage Loan to Values
Loan, credit indicator ratio less than or equal to 80%	12,098,000,000	12,098,000,000	12,724,000,000
Loan, credit indicator ratio greater than 80% but less than or equal to 100%	9,480,000,000	9,480,000,000	10,232,000,000
Loan, credit indicator ratio greater than 100%	16,811,000,000	16,811,000,000	18,226,000,000
Home equity loans | Consumer Credit Scores (FICOs)
Consumer Loans Credit Quality Indicators, FICO score
Loan, credit score less than 620	5,977,000,000	5,977,000,000	6,783,000,000
Loan, credit score equal to or greater than 620 but less than 660	3,567,000,000	3,567,000,000	3,703,000,000
Loan, credit score equal to or greater than 660	29,038,000,000	29,038,000,000	30,884,000,000
Credit cards | Consumer Credit Scores (FICOs)
Consumer Loans Credit Quality Indicators, FICO score
Loan, credit score less than 620	8,024,000,000	8,024,000,000	9,621,000,000
Loan, credit score equal to or greater than 620 but less than 660	10,140,000,000	10,140,000,000	10,905,000,000
Loan, credit score equal to or greater than 660	87,827,000,000	87,827,000,000	93,234,000,000
Installment and other | Consumer Credit Scores (FICOs)
Consumer Loans Credit Quality Indicators, FICO score
Loan, credit score less than 620	4,350,000,000	4,350,000,000	3,789,000,000
Loan, credit score equal to or greater than 620 but less than 660	2,477,000,000	2,477,000,000	2,858,000,000
Loan, credit score equal to or greater than 660	5,596,000,000	5,596,000,000	6,704,000,000
Consumer
Loans receivable
Recorded investment in loans	386,158,000,000	386,158,000,000	398,135,000,000
Loans, 30-89 days past due	8,089,000,000	8,089,000,000	9,249,000,000
Loans, greater than or equal to 90 days past due	8,445,000,000	8,445,000,000	9,270,000,000
Loans, Past due Government guaranteed	6,435,000,000	6,435,000,000	6,686,000,000
Loans, net of unearned income	409,127,000,000	409,127,000,000	423,340,000,000
Loans, total non-accrual	8,346,000,000	8,346,000,000	7,832,000,000
Loans, 90 days past due and accruing	7,143,000,000	7,143,000,000	7,626,000,000
Loans less than this number of days past due are considered current	30	30	30
Loans at fair value	1,260,000,000	1,260,000,000	1,326,000,000
Consumer | Minimum
Residential Mortgage Loan to Values
Minimum number of payments made consecutively for the loans to be re-aged	1	1	1
Consumer | Maximum
Residential Mortgage Loan to Values
Minimum number of payments made consecutively for the loans to be re-aged	3	3	3
Consumer | Loan to Values (LTVs)
Residential Mortgage Loan to Values
Loan, credit indicator ratio less than or equal to 80%	49,729,000,000	49,729,000,000	49,146,000,000
Loan, credit indicator ratio greater than 80% but less than or equal to 100%	29,520,000,000	29,520,000,000	31,378,000,000
Loan, credit indicator ratio greater than 100%	38,219,000,000	38,219,000,000	42,651,000,000
Consumer | Consumer Credit Scores (FICOs)
Consumer Loans Credit Quality Indicators, FICO score
Loan, credit score less than 620	36,761,000,000	36,761,000,000	40,563,000,000
Loan, credit score equal to or greater than 620 but less than 660	24,723,000,000	24,723,000,000	26,281,000,000
Loan, credit score equal to or greater than 660	174,577,000,000	174,577,000,000	183,661,000,000
Consumer | Residential First Mortgage Loans
Loans receivable
Loans at fair value	1,300,000,000	1,300,000,000	1,300,000,000
Delinquency status
Number of days past due, non-accrual status	90	90	90
Consumer | Home equity loans
Delinquency status
Number of days past due, non-accrual status	90	90	90
Consumer | Credit cards
Delinquency status
Number of days past due, non-accrual status	180	180	180
Consumer | Commercial market loans
Delinquency status
Number of days past due, non-accrual status	90	90	90
Consumer | Special Asset Pool (SAP)
Loans receivable
Recorded investment in loans	662,000,000	662,000,000	1,193,000,000
Loans, 30-89 days past due	26,000,000	26,000,000	29,000,000
Loans, greater than or equal to 90 days past due	33,000,000	33,000,000	47,000,000
Loans, net of unearned income	721,000,000	721,000,000	1,269,000,000
Loans, total non-accrual	96,000,000	96,000,000	115,000,000
Consumer | Total GCB and LCL
Loans receivable
Recorded investment in loans	385,496,000,000	385,496,000,000	396,942,000,000
Loans, 30-89 days past due	8,063,000,000	8,063,000,000	9,220,000,000
Loans, greater than or equal to 90 days past due	8,412,000,000	8,412,000,000	9,223,000,000
Loans, Past due Government guaranteed	6,435,000,000	6,435,000,000	6,686,000,000
Loans, net of unearned income	408,406,000,000	408,406,000,000	422,071,000,000
Loans, total non-accrual	8,250,000,000	8,250,000,000	7,717,000,000
Loans, 90 days past due and accruing	7,143,000,000	7,143,000,000	7,626,000,000
Consumer | In North America Offices
Loans receivable
Recorded investment in loans	245,555,000,000	245,555,000,000	258,546,000,000
Loans, 30-89 days past due	5,972,000,000	5,972,000,000	7,117,000,000
Loans, greater than or equal to 90 days past due	6,836,000,000	6,836,000,000	7,630,000,000
Loans, Past due Government guaranteed	6,435,000,000	6,435,000,000	6,686,000,000
Loans, net of unearned income	264,798,000,000	264,798,000,000	279,979,000,000
Loans, total non-accrual	6,351,000,000	6,351,000,000	5,816,000,000
Loans, 90 days past due and accruing	6,646,000,000	6,646,000,000	7,136,000,000
Consumer | In North America Offices | Residential First Mortgage Loans
Loans receivable
Recorded investment in loans	78,226,000,000	78,226,000,000	81,081,000,000
Loans, 30-89 days past due	3,287,000,000	3,287,000,000	3,550,000,000
Loans, greater than or equal to 90 days past due	4,029,000,000	4,029,000,000	4,121,000,000
Loans, Past due Government guaranteed	6,435,000,000	6,435,000,000	6,686,000,000
Loans, net of unearned income	91,977,000,000	91,977,000,000	95,438,000,000
Loans, total non-accrual	4,248,000,000	4,248,000,000	4,176,000,000
Loans, 90 days past due and accruing	5,028,000,000	5,028,000,000	5,054,000,000
Loans, 30-89 days past due, guaranteed by U.S. government-sponsored agencies	1,400,000,000	1,400,000,000	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	5,000,000,000	5,100,000,000
Consumer | In North America Offices | Home equity loans
Loans receivable
Recorded investment in loans	38,835,000,000	38,835,000,000	41,585,000,000
Loans, 30-89 days past due	729,000,000	729,000,000	868,000,000
Loans, greater than or equal to 90 days past due	895,000,000	895,000,000	1,022,000,000
Loans, net of unearned income	40,459,000,000	40,459,000,000	43,475,000,000
Loans, total non-accrual	1,615,000,000	1,615,000,000	982,000,000
Consumer | In North America Offices | Credit cards
Loans receivable
Recorded investment in loans	107,031,000,000	107,031,000,000	114,022,000,000
Loans, 30-89 days past due	1,640,000,000	1,640,000,000	2,344,000,000
Loans, greater than or equal to 90 days past due	1,597,000,000	1,597,000,000	2,058,000,000
Loans, net of unearned income	110,268,000,000	110,268,000,000	118,424,000,000
Loans, 90 days past due and accruing	1,597,000,000	1,597,000,000	2,058,000,000
Consumer | In North America Offices | Installment and other
Loans receivable
Recorded investment in loans	14,333,000,000	14,333,000,000	15,215,000,000
Loans, 30-89 days past due	285,000,000	285,000,000	340,000,000
Loans, greater than or equal to 90 days past due	175,000,000	175,000,000	222,000,000
Loans, net of unearned income	14,793,000,000	14,793,000,000	15,777,000,000
Loans, total non-accrual	334,000,000	334,000,000	438,000,000
Loans, 90 days past due and accruing	13,000,000	13,000,000	10,000,000
Consumer | In North America Offices | Commercial market loans
Loans receivable
Recorded investment in loans	7,130,000,000	7,130,000,000	6,643,000,000
Loans, 30-89 days past due	31,000,000	31,000,000	15,000,000
Loans, greater than or equal to 90 days past due	140,000,000	140,000,000	207,000,000
Loans, net of unearned income	7,301,000,000	7,301,000,000	6,865,000,000
Loans, total non-accrual	154,000,000	154,000,000	220,000,000
Loans, 90 days past due and accruing	8,000,000	8,000,000	14,000,000
Consumer | In offices outside North America
Loans receivable
Recorded investment in loans	139,941,000,000	139,941,000,000	138,396,000,000
Loans, 30-89 days past due	2,091,000,000	2,091,000,000	2,103,000,000
Loans, greater than or equal to 90 days past due	1,576,000,000	1,576,000,000	1,593,000,000
Loans, net of unearned income	143,608,000,000	143,608,000,000	142,092,000,000
Loans, total non-accrual	1,899,000,000	1,899,000,000	1,901,000,000
Loans, 90 days past due and accruing	497,000,000	497,000,000	490,000,000
Consumer | In offices outside North America | Residential First Mortgage Loans
Loans receivable
Recorded investment in loans	43,354,000,000	43,354,000,000	43,310,000,000
Loans, 30-89 days past due	560,000,000	560,000,000	566,000,000
Loans, greater than or equal to 90 days past due	453,000,000	453,000,000	482,000,000
Loans, net of unearned income	44,367,000,000	44,367,000,000	44,358,000,000
Loans, total non-accrual	723,000,000	723,000,000	744,000,000
Consumer | In offices outside North America | Home equity loans
Loans receivable
Recorded investment in loans	5,000,000	5,000,000	6,000,000
Loans, greater than or equal to 90 days past due	2,000,000	2,000,000	2,000,000
Loans, net of unearned income	7,000,000	7,000,000	8,000,000
Loans, total non-accrual	3,000,000	3,000,000	2,000,000
Consumer | In offices outside North America | Credit cards
Loans receivable
Recorded investment in loans	37,031,000,000	37,031,000,000	38,289,000,000
Loans, 30-89 days past due	946,000,000	946,000,000	930,000,000
Loans, greater than or equal to 90 days past due	787,000,000	787,000,000	785,000,000
Loans, net of unearned income	38,764,000,000	38,764,000,000	40,004,000,000
Loans, total non-accrual	513,000,000	513,000,000	496,000,000
Loans, 90 days past due and accruing	497,000,000	497,000,000	490,000,000
Consumer | In offices outside North America | Installment and other
Loans receivable
Recorded investment in loans	28,179,000,000	28,179,000,000	26,300,000,000
Loans, 30-89 days past due	530,000,000	530,000,000	528,000,000
Loans, greater than or equal to 90 days past due	202,000,000	202,000,000	197,000,000
Loans, net of unearned income	28,911,000,000	28,911,000,000	27,025,000,000
Loans, total non-accrual	258,000,000	258,000,000	258,000,000
Consumer | In offices outside North America | Commercial market loans
Loans receivable
Recorded investment in loans	31,372,000,000	31,372,000,000	30,491,000,000
Loans, 30-89 days past due	55,000,000	55,000,000	79,000,000
Loans, greater than or equal to 90 days past due	132,000,000	132,000,000	127,000,000
Loans, net of unearned income	31,559,000,000	31,559,000,000	30,697,000,000
Loans, total non-accrual	$ 402,000,000	$ 402,000,000	$ 401,000,000
Open-ended consumer loans
Residential Mortgage Loan to Values
Minimum number of payments made consecutively for the loans to be re-aged	3	3	3
Number of re-age modification limitations in twelve months	1	1	1
Number of re-age modification limitations in five years	3	3	3