FAIR VALUE ELECTIONS (Details 2) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 D	Jun. 30, 2011	Dec. 31, 2011
FAIR VALUE ELECTIONS
Gain (loss) on change in estimated fair value of debt liabilities due to change in company's own credit risk	$ 270,000,000	$ 241,000,000	$ (992,000,000)	$ 128,000,000
Notional amount of unfunded letters of credit	300,000,000		300,000,000		600,000,000
Maximum period funded letters of credit past due or on non-accrual status (in days)			90
Consolidated VIEs
Fair Value Option Quantitative Disclosures
Aggregate unpaid principal balance in excess of fair value	955,000,000		955,000,000		984,000,000
Certain credit products (Trading account assets)
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	13,141,000,000		13,141,000,000		14,150,000,000
Aggregate unpaid principal balance in excess of fair value	(181,000,000)		(181,000,000)		540,000,000
Balance of non-accrual loans or loans more than 90 days past due	169,000,000		169,000,000		134,000,000
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due	25,000,000		25,000,000		43,000,000
Certain credit products (Loans)
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	3,667,000,000		3,667,000,000		3,735,000,000
Aggregate unpaid principal balance in excess of fair value	(91,000,000)		(91,000,000)		(54,000,000)
Unfunded loan commitments outstanding, certain credit related products	1,546,000,000		1,546,000,000		648,000,000
Changes in fair value due to instrument-specific credit risk gain (loss)			29,000,000	34,000,000
Certain mortgage loans (long-term debts)
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	4,606,000,000		4,606,000,000		6,213,000,000
Aggregate fair value in excess of unpaid principal balance	273,000,000		273,000,000		274,000,000
Changes in fair value due to instrument-specific credit risk gain (loss)				(200,000)
Certain mortgage loans (long-term debts) | Consolidated VIEs
Fair Value Option Quantitative Disclosures
Changes in fair value due to instrument-specific credit risk gain (loss)			(69,000,000)	(169,000,000)
VIE Corporate loans
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	156,000,000		156,000,000		198,000,000
Aggregate unpaid principal balance in excess of fair value	389,000,000		389,000,000		394,000,000
Balance of non-accrual loans or loans more than 90 days past due	23,000,000		23,000,000		23,000,000
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due	43,000,000		43,000,000		42,000,000
VIE Consumer loans
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	1,226,000,000		1,226,000,000		1,292,000,000
Aggregate unpaid principal balance in excess of fair value	379,000,000		379,000,000		436,000,000
Balance of non-accrual loans or loans more than 90 days past due	102,000,000		102,000,000		86,000,000
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due	123,000,000		123,000,000		120,000,000
Long-term debt:
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	25,146,000,000		25,146,000,000		22,614,000,000
Aggregate unpaid principal balance in excess of fair value	(2,314,000,000)		(2,314,000,000)		1,680,000,000
Short-term borrowings:
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	1,043,000,000		1,043,000,000		1,354,000,000
Aggregate unpaid principal balance in excess of fair value	$ (125,000,000)		$ (125,000,000)		$ 49,000,000