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Mortgage Loans Credit Quality Indicators - SF (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment $ 3,053,156 [1] $ 3,007,471 [1]
Primary [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 2,627,539 [1],[2],[3],[4] 2,544,315 [1],[2],[3],[4]
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 2,049,537 [1],[2],[3],[4] 1,703,384 [1],[2],[3],[4]
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 273,714 [1],[2],[3],[4] 346,018 [1],[2],[3],[4]
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 146,419 [1],[2],[3],[4] 219,736 [1],[2],[3],[4]
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 61,959 [1],[2],[3],[4] 100,302 [1],[2],[3],[4]
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 35,858 [1],[2],[3],[4] 59,723 [1],[2],[3],[4]
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 12,052 [1],[2],[3],[4] 20,620 [1],[2],[3],[4]
Primary [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 125% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 48,000 [1],[2],[3],[4] 94,532 [1],[2],[3],[4]
Alt-A [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 132,347 [1],[2],[3] 151,706 [1],[2],[3]
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 62,896 [1],[2],[3] 57,419 [1],[2],[3]
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 17,362 [1],[2],[3] 18,313 [1],[2],[3]
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 14,974 [1],[2],[3] 16,930 [1],[2],[3]
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 11,238 [1],[2],[3] 14,293 [1],[2],[3]
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 8,125 [1],[2],[3] 10,994 [1],[2],[3]
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 3,105 [1],[2],[3] 4,387 [1],[2],[3]
Alt-A [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 125% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 14,647 [1],[2],[3] 29,370 [1],[2],[3]
Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 55,933 [1],[2],[3],[5] 69,529 [1],[2],[3],[5]
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 24,554 [1],[2],[3],[5] 21,936 [1],[2],[3],[5]
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 7,064 [1],[2],[3],[5] 7,287 [1],[2],[3],[5]
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 6,711 [1],[2],[3],[5] 7,369 [1],[2],[3],[5]
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 5,441 [1],[2],[3],[5] 7,169 [1],[2],[3],[5]
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 3,973 [1],[2],[3],[5] 6,231 [1],[2],[3],[5]
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 1,535 [1],[2],[3],[5] 2,665 [1],[2],[3],[5]
Other [Member] | Estimated Mark-to-Market Loan-to-Value Ratio Greater Than 125% [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 6,655 [1],[2],[3],[5] 16,872 [1],[2],[3],[5]
Single-Family [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 2,865,068 [1] 2,816,420 [1]
Single-Family [Member] | Primary [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 2,627,539 [1],[4] 2,544,315 [1],[4]
Single-Family [Member] | Government [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 49,249 [1],[6] 50,870 [1],[6]
Single-Family [Member] | Alt-A [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment 132,347 [1] 151,706 [1]
Single-Family [Member] | Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment $ 55,933 [1],[5] $ 69,529 [1],[5]
[1] Recorded investment consists of unpaid principal balance, unamortized premiums, discounts and other cost basis adjustments, and accrued interest receivable.
[2] Excludes $49.2 billion and $50.9 billion as of September 30, 2013 and December 31, 2012, 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 ratio.
[3] 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.
[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.