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Mortgage Loans Individually Impaired Loans (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance $ 191,771,000,000 $ 190,677,000,000
Individually impaired loans with related allowance recorded: total recorded investment 181,531,000,000 [1] 180,519,000,000 [1]
Individually impaired loans with related allowance recorded: related allowance for loan losses 44,786,000,000 [2] 45,034,000,000 [2]
Individually impaired loans with no related allowance recorded: unpaid principal balance 16,817,000,000 [3] 23,594,000,000 [3]
Individually impaired loans with no related allowance recorded: total recorded investment 13,585,000,000 [1],[3] 19,872,000,000 [1],[3]
Total individually impaired loans: unpaid principal balance 208,588,000,000 [2] 214,271,000,000 [2]
Total individually impaired loans: total recorded investment 195,116,000,000 [1],[2] 200,391,000,000 [1],[2]
Interest Receivable [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: related allowance for loan losses 930,000,000 [2] 998,000,000 [2]
Single-Family [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 189,055,000,000 188,228,000,000
Individually impaired loans with related allowance recorded: total recorded investment 178,791,000,000 [1] 178,048,000,000 [1]
Individually impaired loans with related allowance recorded: related allowance for loan losses 44,281,000,000 44,545,000,000
Individually impaired loans with no related allowance recorded: unpaid principal balance 15,528,000,000 [3] 21,538,000,000 [3]
Individually impaired loans with no related allowance recorded: total recorded investment 12,282,000,000 [1],[3] 17,804,000,000 [1],[3]
Table Footnote [Abstract]    
Troubled debt restructuring recorded investment 189,200,000,000 193,400,000,000
Single-Family [Member] | Interest Receivable [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: related allowance for loan losses 914,000,000 985,000,000
Multifamily [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 2,716,000,000 2,449,000,000
Individually impaired loans with related allowance recorded: total recorded investment 2,740,000,000 [1] 2,471,000,000 [1]
Individually impaired loans with related allowance recorded: related allowance for loan losses 505,000,000 489,000,000
Individually impaired loans with no related allowance recorded: unpaid principal balance 1,289,000,000 [3] 2,056,000,000 [3]
Individually impaired loans with no related allowance recorded: total recorded investment 1,303,000,000 [1],[3] 2,068,000,000 [1],[3]
Table Footnote [Abstract]    
Troubled debt restructuring recorded investment 1,100,000,000 1,100,000,000
Multifamily [Member] | Interest Receivable [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: related allowance for loan losses 16,000,000 13,000,000
Primary [Member] | Single-Family [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 133,620,000,000 [4] 132,754,000,000 [4]
Individually impaired loans with related allowance recorded: total recorded investment 126,973,000,000 [1],[4] 126,106,000,000 [1],[4]
Individually impaired loans with related allowance recorded: related allowance for loan losses 28,492,000,000 [4] 28,610,000,000 [4]
Individually impaired loans with no related allowance recorded: unpaid principal balance 11,739,000,000 [3],[4] 16,222,000,000 [3],[4]
Individually impaired loans with no related allowance recorded: total recorded investment 9,719,000,000 [1],[3],[4] 13,901,000,000 [1],[3],[4]
Primary [Member] | Single-Family [Member] | Interest Receivable [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: related allowance for loan losses 580,000,000 [4] 628,000,000 [4]
Government [Member] | Single-Family [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 220,000,000 [5] 214,000,000 [5]
Individually impaired loans with related allowance recorded: total recorded investment 213,000,000 [1],[5] 208,000,000 [1],[5]
Individually impaired loans with related allowance recorded: related allowance for loan losses 37,000,000 [5] 38,000,000 [5]
Individually impaired loans with no related allowance recorded: unpaid principal balance 109,000,000 [3],[5] 104,000,000 [3],[5]
Individually impaired loans with no related allowance recorded: total recorded investment 110,000,000 [1],[3],[5] 104,000,000 [1],[3],[5]
Government [Member] | Single-Family [Member] | Interest Receivable [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: related allowance for loan losses 4,000,000 [5] 4,000,000 [5]
Alt-A [Member] | Single-Family [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 38,525,000,000 38,387,000,000
Individually impaired loans with related allowance recorded: total recorded investment 35,685,000,000 [1] 35,620,000,000 [1]
Individually impaired loans with related allowance recorded: related allowance for loan losses 11,121,000,000 11,154,000,000
Individually impaired loans with no related allowance recorded: unpaid principal balance 2,880,000,000 [3] 3,994,000,000 [3]
Individually impaired loans with no related allowance recorded: total recorded investment 1,857,000,000 [1],[3] 2,822,000,000 [1],[3]
Alt-A [Member] | Single-Family [Member] | Interest Receivable [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: related allowance for loan losses 251,000,000 267,000,000
Other [Member] | Single-Family [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: unpaid principal balance 16,690,000,000 [6] 16,873,000,000 [6]
Individually impaired loans with related allowance recorded: total recorded investment 15,920,000,000 [1],[6] 16,114,000,000 [1],[6]
Individually impaired loans with related allowance recorded: related allowance for loan losses 4,631,000,000 [6] 4,743,000,000 [6]
Individually impaired loans with no related allowance recorded: unpaid principal balance 800,000,000 [3],[6] 1,218,000,000 [3],[6]
Individually impaired loans with no related allowance recorded: total recorded investment 596,000,000 [1],[3],[6] 977,000,000 [1],[3],[6]
Other [Member] | Single-Family [Member] | Interest Receivable [Member]
   
Financing Receivable, Impaired [Line Items]    
Individually impaired loans with related allowance recorded: related allowance for loan losses $ 79,000,000 [6] $ 86,000,000 [6]
[1] Recorded investment consists of unpaid principal balance, unamortized premiums, discounts and other cost basis adjustments, and accrued interest receivable.
[2] Includes single-family loans restructured in a TDR with a recorded investment of $189.2 billion and $193.4 billion as of March 31, 2013 and December 31, 2012, respectively. Includes multifamily loans restructured in a TDR with a recorded investment of $1.1 billion as of March 31, 2013 and December 31, 2012.
[3] The discounted cash flows or collateral value equals or exceeds the carrying value of the loan and, as such, no valuation allowance is required.
[4] Consists of mortgage loans that are not included in other loan classes.
[5] 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.
[6] Includes loans with higher-risk characteristics, such as interest-only loans and negative-amortizing loans that are neither government nor Alt-A.