Variable Interest Entities - Firm Sponsored Variable Interest Entities (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Firm-sponsored mortgage and other consumer securitization trusts
Total assets held by securitization VIEs	$ 271,700,000,000	$ 295,800,000,000
Percentage of the Firm's retained securitization interests risk-rated 'A' or better, at fair value	69.00%	74.00%
Corporate & Investment Bank [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Senior securities purchased, excluded from interests continued to be held by transferor, fair value	151,000,000	131,000,000
Subordinated securities purchased, excluded from interests continued to be held by transferor, fair value	30,000,000	45,000,000
Prime / Alt-A & Option AR [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Total assets held by securitization VIEs	109,200,000,000	133,500,000,000
Prime / Alt-A & Option AR [Member] | External Credit Rating, Investment Grade [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Retained interest, fair value	551,000,000	170,000,000
Prime / Alt-A & Option AR [Member] | Non Investment Grade BBplus and below [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Retained interest, fair value	260,000,000	171,000,000
Subprime mortgage [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Total assets held by securitization VIEs	32,100,000,000	34,500,000,000
Commercial mortgage [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Total assets held by securitization VIEs	130,400,000,000	127,800,000,000
Commercial mortgage [Member] | External Credit Rating, Investment Grade [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Retained interest, fair value	3,900,000,000	4,100,000,000
Commercial mortgage [Member] | Non Investment Grade BBplus and below [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Retained interest, fair value	80,000,000	164,000,000
Variable Interest Entity, Primary Beneficiary [Member]
Firm-sponsored mortgage and other consumer securitization trusts
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]
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in consolidated securitization VIEs	3,200,000,000	2,700,000,000
Variable Interest Entity, Primary Beneficiary [Member] | Subprime mortgage [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in consolidated securitization VIEs	1,300,000,000	1,300,000,000
Variable Interest Entity, Primary Beneficiary [Member] | Commercial mortgage [Member]
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in consolidated securitization VIEs	0	0
Firm-sponsored credit card trusts [Member]
Firm-sponsored credit card securitization trusts
Average undivided interest in VIE principal receivables	30.00%	28.00%
Interest in sponsored credit card securitization trusts	14,300,000,000	15,800,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	14,300,000,000	15,800,000,000
Firm-sponsored credit card trusts [Member] | Senior securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	130,000,000	362,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	130,000,000	362,000,000
Firm-sponsored credit card trusts [Member] | Subordinated securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	5,500,000,000	4,600,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	5,500,000,000	4,600,000,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	4,900,000,000	4,700,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in nonconsolidated securitization VIEs with continuing involvement	216,407,000,000	219,765,000,000
Interest in sponsored credit card securitization trusts	4,900,000,000	4,700,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Trading assets [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	1,100,000,000	1,900,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	1,100,000,000	1,900,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Available-for-sale Securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	3,800,000,000	2,800,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	3,800,000,000	2,800,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Prime / Alt-A & Option AR [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	800,000,000	300,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in nonconsolidated securitization VIEs with continuing involvement	90,381,000,000	106,667,000,000
Interest in sponsored credit card securitization trusts	800,000,000	300,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Prime / Alt-A & Option AR [Member] | Trading assets [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	500,000,000	300,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	500,000,000	300,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Prime / Alt-A & Option AR [Member] | Available-for-sale Securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	300,000,000	0
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	300,000,000	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Subprime mortgage [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	100,000,000	100,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in nonconsolidated securitization VIEs with continuing involvement	28,008,000,000	31,264,000,000
Interest in sponsored credit card securitization trusts	100,000,000	100,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Subprime mortgage [Member] | Trading assets [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	100,000,000	100,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	100,000,000	100,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Subprime mortgage [Member] | Available-for-sale Securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	0	0
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	0	0
Variable Interest Entity, Not Primary Beneficiary [Member] | Commercial mortgage [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	4,000,000,000	4,300,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Assets held in nonconsolidated securitization VIEs with continuing involvement	98,018,000,000	81,834,000,000
Interest in sponsored credit card securitization trusts	4,000,000,000	4,300,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Commercial mortgage [Member] | Trading assets [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	500,000,000	1,500,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	500,000,000	1,500,000,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Commercial mortgage [Member] | Available-for-sale Securities [Member]
Firm-sponsored credit card securitization trusts
Interest in sponsored credit card securitization trusts	3,500,000,000	2,800,000,000
Firm-sponsored mortgage and other consumer securitization trusts
Interest in sponsored credit card securitization trusts	$ 3,500,000,000	$ 2,800,000,000
Minimum [Member] | Firm-sponsored credit card trusts [Member]
Firm-sponsored credit card securitization trusts
Average undivided interest in VIE principal receivables	4.00%