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Mortgage Loans Credit Quality Indicators - SF (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment $ 3,007,471 [1] $ 2,978,891 [1]
Single-Family [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 2,816,420 [1] 2,799,670 [1]
Single-Family [Member] | Primary [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 2,544,315 [1],[2],[3],[4] 2,481,156 [1],[2],[3],[4]
Single-Family [Member] | Primary [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Less Than or Equal to 80% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 1,703,384 [1],[2],[3],[4] 1,464,348 [1],[2],[3],[4]
Single-Family [Member] | Primary [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 80% and Less Than or Equal to 90% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 346,018 [1],[2],[3],[4] 412,342 [1],[2],[3],[4]
Single-Family [Member] | Primary [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 90% and Less Than or Equal to 100% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 219,736 [1],[2],[3],[4] 246,648 [1],[2],[3],[4]
Single-Family [Member] | Primary [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 100% and Less Than or Equal to 110% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 100,302 [1],[2],[3],[4] 128,428 [1],[2],[3],[4]
Single-Family [Member] | Primary [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 110% and Less Than or Equal to 120% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 59,723 [1],[2],[3],[4] 73,836 [1],[2],[3],[4]
Single-Family [Member] | Primary [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 120% and Less Than or Equal to 125% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 20,620 [1],[2],[3],[4] 25,750 [1],[2],[3],[4]
Single-Family [Member] | Primary [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 125% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 94,532 [1],[2],[3],[4] 129,804 [1],[2],[3],[4]
Single-Family [Member] | Alt-A [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 151,706 [1],[2],[3] 177,412 [1],[2],[3]
Single-Family [Member] | Alt-A [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Less Than or Equal to 80% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 57,419 [1],[2],[3] 61,618 [1],[2],[3]
Single-Family [Member] | Alt-A [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 80% and Less Than or Equal to 90% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 18,313 [1],[2],[3] 21,369 [1],[2],[3]
Single-Family [Member] | Alt-A [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 90% and Less Than or Equal to 100% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 16,930 [1],[2],[3] 19,790 [1],[2],[3]
Single-Family [Member] | Alt-A [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 100% and Less Than or Equal to 110% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 14,293 [1],[2],[3] 16,164 [1],[2],[3]
Single-Family [Member] | Alt-A [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 110% and Less Than or Equal to 120% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 10,994 [1],[2],[3] 12,534 [1],[2],[3]
Single-Family [Member] | Alt-A [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 120% and Less Than or Equal to 125% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 4,387 [1],[2],[3] 5,087 [1],[2],[3]
Single-Family [Member] | Alt-A [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 125% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 29,370 [1],[2],[3] 40,850 [1],[2],[3]
Single-Family [Member] | Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 69,529 [1],[2],[3],[5] 89,226 [1],[2],[3],[5]
Single-Family [Member] | Other [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Less Than or Equal to 80% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 21,936 [1],[2],[3],[5] 23,414 [1],[2],[3],[5]
Single-Family [Member] | Other [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 80% and Less Than or Equal to 90% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 7,287 [1],[2],[3],[5] 9,224 [1],[2],[3],[5]
Single-Family [Member] | Other [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 90% and Less Than or Equal to 100% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 7,369 [1],[2],[3],[5] 9,445 [1],[2],[3],[5]
Single-Family [Member] | Other [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 100% and Less Than or Equal to 110% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 7,169 [1],[2],[3],[5] 8,951 [1],[2],[3],[5]
Single-Family [Member] | Other [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 110% and Less Than or Equal to 120% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 6,231 [1],[2],[3],[5] 7,912 [1],[2],[3],[5]
Single-Family [Member] | Other [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 120% and Less Than or Equal to 125% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 2,665 [1],[2],[3],[5] 3,557 [1],[2],[3],[5]
Single-Family [Member] | Other [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 125% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 16,872 [1],[2],[3],[5] 26,723 [1],[2],[3],[5]
Single-Family [Member] | Government [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment $ 50,870 [1],[6] $ 51,876 [1],[6]
[1] Recorded investment consists of unpaid principal balance, unamortized premiums, discounts and other cost basis adjustments, and accrued interest receivable.
[2] The aggregate estimated mark-to-market LTV ratio is based on the unpaid principal balance of the loan as of the end of each reported period divided by the estimated current value of the property, which we calculate using an internal valuation model that estimates periodic changes in home value.
[3] Excludes $50.9 billion and $51.9 billion as of December 31, 2012 and 2011, respectively, of mortgage loans guaranteed or insured, in whole or in part, by the U.S. government or one of its agencies that are not Alt-A loans. The segment class is primarily reverse mortgages for which we do not calculate an estimated mark-to-market LTV.
[4] Consists of mortgage loans that are not included in other loan classes.
[5] Includes loans with higher-risk loan characteristics, such as interest-only loans and negative-amortizing loans that are neither government nor Alt-A.
[6] Consists of mortgage loans guaranteed or insured, in whole or in part, by the U.S. government or one of its agencies that are not Alt-A. Primarily consists of reverse mortgages which due to their nature are not aged and are included in the current column.