FAIR VALUE ELECTIONS (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
FAIR VALUE ELECTIONS
Gain (loss) on change in estimated fair value of debt liabilities due to change in company's own credit risk	$ (210,000,000)	$ (1,262,000,000)
Forward purchase derivative contract
Fair Value Option Quantitative Disclosures
Derivative notional	8,000,000,000
Forward sale derivative contract
Fair Value Option Quantitative Disclosures
Derivative notional	5,700,000,000
Consolidated VIEs
Fair Value Option Quantitative Disclosures
Aggregate unpaid principal balance in excess of (less than) fair value	376,000,000		869,000,000
Certain credit products (Trading account assets)
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	10,511,000,000		11,658,000,000
Aggregate unpaid principal balance in excess of (less than) fair value	(228,000,000)		31,000,000
Balance of non-accrual loans or loans more than 90 days past due	86,000,000		104,000,000
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due	75,000,000		85,000,000
Certain credit products (Loans)
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	3,633,000,000		3,893,000,000
Aggregate unpaid principal balance in excess of (less than) fair value	(54,000,000)		(132,000,000)
Unfunded loan commitments outstanding, certain credit related products	1,786,000,000		1,891,000,000
Changes in fair value due to instrument-specific credit risk gain (loss)	1,000,000	11,000,000
Certain mortgage loans (long-term debts)
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	6,441,000,000		6,879,000,000
Aggregate fair value in excess of unpaid principal balance	268,000,000		390,000,000
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)	(33,000,000)	(15,000,000)
VIE Corporate loans
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	147,000,000		157,000,000
Aggregate unpaid principal balance in excess of (less than) fair value	335,000,000		347,000,000
Balance of non-accrual loans or loans more than 90 days past due	33,000,000		34,000,000
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due	31,000,000		36,000,000
VIE Consumer loans
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	1,159,000,000		1,191,000,000
Aggregate unpaid principal balance in excess of (less than) fair value	250,000,000		293,000,000
Balance of non-accrual loans or loans more than 90 days past due	110,000,000		123,000,000
Aggregate unpaid principal balance in excess of fair value for non-accrual loans or loans more than 90 days past due	114,000,000		111,000,000
Long-term debt:
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	26,866,000,000		28,434,000,000
Aggregate unpaid principal balance in excess of (less than) fair value	(347,000,000)		(226,000,000)
Short-term borrowings:
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	915,000,000		818,000,000
Aggregate unpaid principal balance in excess of (less than) fair value	(226,000,000)		(232,000,000)
Certain Investments in Unallocated Precious Metals
Fair Value Option Quantitative Disclosures
Carrying amount reported on the Consolidated Balance Sheet	$ 2,900,000,000		$ 5,500,000,000