Variable Interest Entities - Resecuritizations, Multi-seller Conduits (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Securities transferred to agency resecuritization VIEs	$ 22,700,000,000	$ 25,300,000,000	$ 10,000,000,000
Securities transferred to private-label re-securitization VIEs	1,100,000,000	55,000,000	286,000,000
Total assets	2,573,126,000,000us-gaap_Assets	2,415,689,000,000us-gaap_Assets	2,359,141,000,000us-gaap_Assets
Off-balance sheet lending-related financial commitments, contractual amount	1,056,172,000,000	1,031,672,000,000	1,027,988,000,000
Putable floating-rate certificates of municipal bond vehicles	55,000,000	262,000,000
Maximum
Variable Interest Entity [Line Items]
Program-wide credit enhancement required amount	10.00%
Putable floating-rate certificates of municipal bond vehicles	250,000,000
Putable floating rate certificates of municipal bond vehicles percent	3.00%
Not Primary Beneficiary, Nonconsolidated Private-Label Re-securitizations
Variable Interest Entity [Line Items]
Total assets	2,900,000,000	2,800,000,000
Mortgage Securitization Entities \| Private label Resecuritizations
Variable Interest Entity [Line Items]
Senior and subordinated interest in nonconsolidated agency re-securitization entities	36,000,000	6,000,000
Mortgage Securitization Entities \| Private label Resecuritizations \| Residential mortgage-backed securities
Variable Interest Entity [Line Items]
VIE, consolidated, carrying amount assets	77,000,000	86,000,000
VIE, consolidated, carrying amount liabilities	21,000,000	23,000,000
Mortgage Securitization Entities \| Re securitizations
Variable Interest Entity [Line Items]
Senior and subordinated interest in nonconsolidated agency re-securitization entities	2,400,000,000	1,300,000,000
Firm-administered multi-seller conduits
Variable Interest Entity [Line Items]
Commercial paper issued by consolidated Variable Interest Entities eliminated in Consolidation	5,700,000,000	4,100,000,000
Firm-administered multi-seller conduits \| Mortgage-backed securities, Commercial
Variable Interest Entity [Line Items]
Off-balance sheet lending-related financial commitments, contractual amount	$ 9,900,000,000	$ 9,100,000,000

The amount of commercial paper issued by variable interest entities that was eliminated in consolidation.

No definition available.

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- Definition

The contractual amount of off-balance sheet lending-related financial instruments (e.g., commitments and guarantees), which represents the maximum possible credit risk should the counterparty draw upon the commitment or the entity be required to fulfill its obligation under the guarantee, and the counterparty subsequently fail to perform according to the terms of the contract.

+ References

No definition available.

+ Details

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- Definition

Required amount of program-wide credit enhancement.

+ References

No definition available.

+ Details

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- Definition

Putable floating-rate certificates of municipal bond vehicles held by the entity.

+ References

No definition available.

+ Details

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- Definition

Largest percentage of the municipal bond vehicles' outstanding putable floating-rate certificates held by the entity at any time during the period.

+ References

No definition available.

+ Details

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- Definition

Amount of securities transferred to agency re-securitization VIEs during the period.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Amount of securities transferred to private-label re-securitization VIEs during the period.

+ References

No definition available.

+ Details

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685

+ Details

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- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

+ Details

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- Details

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- Definition

Net carrying amount of the assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), when the reporting entity is not the VIE's primary beneficiary.

+ References

No definition available.

+ Details

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- Details

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- Details

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