Variable Interest Entities - Loan Delinquencies and Net Charge-offs (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Total assets held by securitization VIEs	$ 254,300,000,000	$ 271,700,000,000
Mortgages - prime, including option ARMS
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Total assets held by securitization VIEs	96,300,000,000	109,200,000,000
Mortgages - subprime
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Total assets held by securitization VIEs	28,400,000,000	32,100,000,000
Mortgage-backed securities, Commercial
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Total assets held by securitization VIEs	129,600,000,000	130,400,000,000
Securitized loans
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	19,358,000,000	24,958,000,000
Liquidation Losses	5,364,000,000	8,111,000,000
Securitized loans in which the firm has no continuing involvement	52,200,000,000	50,800,000,000
Securitized loans \| Mortgages - prime, including option ARMS
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	11,363,000,000	14,882,000,000
Liquidation Losses	2,166,000,000	4,688,000,000
Securitized loans \| Mortgages - subprime
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	6,473,000,000	7,726,000,000
Liquidation Losses	1,931,000,000	2,420,000,000
Securitized loans \| Mortgage-backed securities, Commercial
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
90 days past due	1,522,000,000	2,350,000,000
Liquidation Losses	1,267,000,000	1,003,000,000
Variable Interest Entity, Not Primary Beneficiary
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Securitized assets	198,391,000,000	216,407,000,000
Variable Interest Entity, Not Primary Beneficiary \| Mortgages - prime, including option ARMS
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Securitized assets	78,294,000,000	90,381,000,000
Variable Interest Entity, Not Primary Beneficiary \| Mortgages - subprime
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Securitized assets	25,659,000,000	28,008,000,000
Variable Interest Entity, Not Primary Beneficiary \| Mortgage-backed securities, Commercial
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Securitized assets	94,438,000,000	98,018,000,000
Variable Interest Entity, Primary Beneficiary
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Assets held in consolidated securitization VIEs	3,700,000,000	4,500,000,000
Variable Interest Entity, Primary Beneficiary \| Mortgages - prime, including option ARMS
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Assets held in consolidated securitization VIEs	2,700,000,000	3,200,000,000
Variable Interest Entity, Primary Beneficiary \| Mortgages - subprime
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Assets held in consolidated securitization VIEs	800,000,000	1,300,000,000
Variable Interest Entity, Primary Beneficiary \| Mortgage-backed securities, Commercial
Information about delinquencies, net charge-offs, and components of off-balance sheet securitized financial assets [Abstract]
Assets held in consolidated securitization VIEs	$ 200,000,000	$ 0

Securitized loans in which the firm has no continuing involvement.

No definition available.

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Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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Amount of credit loss after recoveries for transferred financial assets that continue to be recognized in the statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 20

-Section 50

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