Variable Interest Entities - Loan Delinquencies and Net Charge-offs (Details 7) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Total assets held by securitization VIEs	$ 271,700,000,000	$ 295,800,000,000
Prime / Alt-A & Option AR [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Total assets held by securitization VIEs	109,200,000,000	133,500,000,000
Subprime mortgage [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Total assets held by securitization VIEs	32,100,000,000	34,500,000,000
Commercial and other [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Total assets held by securitization VIEs	130,400,000,000	127,800,000,000
Securitized loans [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	24,958,000,000	37,512,000,000
Liquidation Losses	8,111,000,000	13,396,000,000
Securitized loans in which the firm has no continuing involvement	50,800,000,000	72,000,000,000
Securitized loans [Member] | Prime / Alt-A & Option AR [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	14,882,000,000	22,865,000,000
Liquidation Losses	4,688,000,000	9,118,000,000
Securitized loans [Member] | Subprime mortgage [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	7,726,000,000	10,570,000,000
Liquidation Losses	2,420,000,000	3,013,000,000
Securitized loans [Member] | Commercial and other [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	2,350,000,000	4,077,000,000
Liquidation Losses	1,003,000,000	1,265,000,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Credit exposure / loans securitized	216,407,000,000	219,765,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Prime / Alt-A & Option AR [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Credit exposure / loans securitized	90,381,000,000	106,667,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Subprime mortgage [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Credit exposure / loans securitized	28,008,000,000	31,264,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Commercial and other [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Credit exposure / loans securitized	98,018,000,000	81,834,000,000
Variable Interest Entity, Primary Beneficiary [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Assets held in consolidated securitization VIEs	4,500,000,000	4,000,000,000
Variable Interest Entity, Primary Beneficiary [Member] | Prime / Alt-A & Option AR [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Assets held in consolidated securitization VIEs	3,200,000,000	2,700,000,000
Variable Interest Entity, Primary Beneficiary [Member] | Subprime mortgage [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Assets held in consolidated securitization VIEs	1,300,000,000	1,300,000,000
Variable Interest Entity, Primary Beneficiary [Member] | Commercial and other [Member]
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Assets held in consolidated securitization VIEs	$ 0	$ 0