Off-Balance Sheet - Loan Sales- and Securitization-Related Indemnifications (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loan sales and securitization-related indemnifications
Percentage Of Decline In Home Prices Assumption	40.00%
Percentage Of Decline In Home Prices Assumption Beyond Firms Current Assumptions	10.00%
Mortgage Repurchase Liability [Member]
Loan sales and securitization-related indemnifications
Valuation Allowances and Reserves Probable Recoveries From Third Parties	$ 441,000,000	$ 577,000,000
Summary of changes in mortgage repurchase liability
Allowance for lending-related commitments, Beginning balance	3,557,000,000	3,285,000,000	1,705,000,000
Valuation Allowances and Reserves, Deductions	(1,158,000,000)	(1,263,000,000)	(1,423,000,000)
Valuation Allowances And Reserves Current Year Provision	412,000,000	1,535,000,000	3,003,000,000
Valuation allowances, Ending balance	2,811,000,000	3,557,000,000	3,285,000,000
Repurchase Make-Whole Settlements [Member]
Summary of changes in mortgage repurchase liability
Valuation Allowances and Reserves, Deductions	(524,000,000)	(640,000,000)	(632,000,000)
Mortgage Repurchase New Loans Sold During Period [Member]
Summary of changes in mortgage repurchase liability
Valuation Allowances And Reserves Current Year Provision	112,000,000	52,000,000	47,000,000
Loans Sold With Recourse [Member]
Summary of changes in mortgage repurchase liability
Valuation allowances, Ending balance	141,000,000	148,000,000
Loans sold with recourse
Indemnification Agreements Loan Sale And Securitization Loans Sold With Recourse Contractual Amount	9,300,000,000	10,400,000,000
Indemnification Agreements, Loan Sale and Securitization, Loans Sold with Recourse: Carrying Value	141,000,000	148,000,000
Minimum [Member] \| Mortgage Repurchase Liability [Member]
Loan sales and securitization-related indemnifications
Loss Contingency, Range of Possible Loss, Portion Not Accrued	0
Range Maximum [Member] \| Mortgage Repurchase Liability [Member]
Loan sales and securitization-related indemnifications
Loss Contingency, Range of Possible Loss, Portion Not Accrued	$ 900,000,000

The carrying value of the related liability of loans sold with recourse.

No definition available.

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- Definition

The contractual amount (unpaid principal balance) of loans sold with recourse.

+ References

No definition available.

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- Definition

Percentage of decline in home prices assumption.

+ References

No definition available.

+ Details

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- Definition

Percentage of decline in home prices assumption beyond firms current assumptions.

+ References

No definition available.

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- Definition

Total probable recoveries from third parties which is netted against the liabilities established to represent expected future costs.

+ References

No definition available.

+ Details

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- Definition

Valuation allowances and reserves provision.

+ References

No definition available.

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- Definition

The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

+ References

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 14

-Paragraph 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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