Other Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Other Assets (Textuals) [Abstract]
Accumulated depreciation and amortization	$ 9,050,000,000	$ 8,460,000,000
Property, leasehold improvements and equipment used for operation	6,200,000,000	6,480,000,000
Assets related to the firm's reinsurance business classified as held for sale	16,920,000,000
Investments accounted for at fair value excluded from Equity-method investments	5,540,000,000	4,170,000,000
Impairment charges related to consolidated investments	400,000,000	440,000,000
Impairment charges related to intangible and other assets	150,000,000
Impairment charges related to property, leasehold improvements and equipment	250,000,000	100,000,000
Impairment losses recognized on assets held for sale		220,000,000
Intangible assets classified as held for sale	149,000,000
Assets related to the firm's reinsurance business	16,770,000,000
Liabilities related to the firm's reinsurance business classified as held for sale	14,620,000,000
Impairment charges related to commodity-related property, leasehold improvements and equipment	160,000,000
Impairment charges related to commodity-related intangible assets	80,000,000	120,000,000
Impairment charges related to New York Stock Exchange Designated Market Maker Rights	40,000,000
Other Assets [Abstract]
Property, leasehold improvements and equipment	8,217,000,000	8,697,000,000
Goodwill and identifiable intangible assets	5,099,000,000	5,468,000,000
Income tax-related assets	5,620,000,000	5,017,000,000
Equity-method investments	453,000,000	664,000,000
Miscellaneous receivables and other	20,234,000,000	3,306,000,000
Total	$ 39,623,000,000	$ 23,152,000,000