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Fair Value Nonrecurring Changes - Prior to Adoption (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Losses on Mortgage loans held for sale $ (8) $ (13)
Total Losses on Other assets (35) (65)
Total Losses on Total assets at fair value (889) (2,925)
Single-Family [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Losses on Acquired property, net (701) (1,512)
Single-Family [Member] | Fannie Mae [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Losses on Mortgage loans held for investment (66) (1,080)
Single-Family [Member] | Consolidated Trusts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Losses on Mortgage loans held for investment (18) (98)
Multifamily [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Losses on Acquired property, net (33) (49)
Multifamily [Member] | Fannie Mae [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Losses on Mortgage loans held for investment (28) (108)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages loans held for sale, at lower of cost or fair value   0
Other assets   0
Total assets at fair value   0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Single-Family [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Acquired property, net   0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Single-Family [Member] | Fannie Mae [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Single-Family [Member] | Consolidated Trusts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Multifamily [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Acquired property, net   0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Multifamily [Member] | Fannie Mae [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   0
Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages loans held for sale, at lower of cost or fair value   2
Other assets   0
Total assets at fair value   2
Significant Other Observable Inputs (Level 2) [Member] | Single-Family [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Acquired property, net   0
Significant Other Observable Inputs (Level 2) [Member] | Single-Family [Member] | Fannie Mae [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   0
Significant Other Observable Inputs (Level 2) [Member] | Single-Family [Member] | Consolidated Trusts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   0
Significant Other Observable Inputs (Level 2) [Member] | Multifamily [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Acquired property, net   0
Significant Other Observable Inputs (Level 2) [Member] | Multifamily [Member] | Fannie Mae [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   0
Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages loans held for sale, at lower of cost or fair value   204
Other assets   877
Total assets at fair value   51,198
Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Acquired property, net   14,806
Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member] | Fannie Mae [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   32,970
Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member] | Consolidated Trusts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   749
Significant Unobservable Inputs (Level 3) [Member] | Multifamily [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Acquired property, net   227
Significant Unobservable Inputs (Level 3) [Member] | Multifamily [Member] | Fannie Mae [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   1,365
Estimated Fair Value [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages loans held for sale, at lower of cost or fair value   206 [1]
Other assets   877 [2]
Total assets at fair value   51,200
Estimated Fair Value [Member] | Sold, Transferred or Liquidated as of Period End [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages loans held for sale, at lower of cost or fair value   56
Mortgage loans held for investment, at amortized cost   3,600
Acquired property, net   8,400
Other assets   144
Estimated Fair Value [Member] | Single-Family [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Acquired property, net   14,806 [3]
Estimated Fair Value [Member] | Single-Family [Member] | Fannie Mae [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   32,970 [4]
Estimated Fair Value [Member] | Single-Family [Member] | Consolidated Trusts [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   749 [4]
Estimated Fair Value [Member] | Multifamily [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Acquired property, net   227 [3]
Estimated Fair Value [Member] | Multifamily [Member] | Fannie Mae [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for investment, at amortized cost   $ 1,365 [4]
[1] Includes $56 million of mortgage loans held for sale that were sold, deconsolidated, retained as a mortgage-related security or redesignated to mortgage loans held for investment as of June 30, 2011.
[2] Includes $144 million of other assets that were sold or transferred as of June 30, 2011.
[3] Includes $8.4 billion of acquired properties that were sold or transferred as of June 30, 2011.
[4] Includes $3.6 billion of mortgage loans held for investment that were liquidated or transferred to foreclosed properties as of June 30, 2011.