FAIR VALUE ELECTIONS (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2012 D	Mar. 31, 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	$ 1,262,000,000	$ 113,000,000
Notional amount of unfunded letters of credit	600,000,000		600,000,000
Maximum period funded letters of credit past due or on non-accrual status (in days)	90
Certain credit products (Trading account assets)
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	14,706,000,000		14,150,000,000
Aggregate unpaid principal balance in excess of fair value	443,000,000		540,000,000
Balance of non-accrual loans or loans more than 90 days past due	35,000,000		134,000,000
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due	40,000,000		43,000,000
Certain credit products (Loans)
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	3,234,000,000		3,735,000,000
Aggregate unpaid principal balance in excess of fair value	(69,000,000)		(54,000,000)
Unfunded loan commitments outstanding, certain credit related products	1,198,000,000		648,000,000
Changes in fair value due to instrument-specific credit risk gain (loss)	11,000,000	14,000,000
Certain mortgage loans (long-term debts)
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	2,862,000,000		6,213,000,000
Aggregate unpaid principal balance in excess of fair value	126,000,000		274,000,000
Changes in fair value due to instrument-specific credit risk gain (loss)		400,000
Certain mortgage loans (long-term debts) | Consolidated VIEs
Fair Value Option Quantitative Disclosures
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due	955,000,000		984,000,000
Changes in fair value due to instrument-specific credit risk gain (loss)	(15,000,000)	(95,000,000)
VIE Corporate loans
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	190,000,000		198,000,000
Aggregate unpaid principal balance in excess of fair value	378,000,000		394,000,000
Balance of non-accrual loans or loans more than 90 days past due	25,000,000		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		42,000,000
VIE Consumer loans
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	1,279,000,000		1,292,000,000
Aggregate unpaid principal balance in excess of fair value	385,000,000		436,000,000
Balance of non-accrual loans or loans more than 90 days past due	121,000,000		86,000,000
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due	93,000,000		120,000,000
Long-term debt:
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	25,172,000,000		22,614,000,000
Aggregate unpaid principal balance in excess of fair value	(1,669,000,000)		1,680,000,000
Short-term borrowings:
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	1,217,000,000		1,354,000,000
Aggregate unpaid principal balance in excess of fair value	$ (105,000,000)		$ 49,000,000