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Fair Value Nonrecurring Changes - Prior to Adoption (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total gains (losses) on mortgage loans held for sale $ 12
Total gains (losses) on other assets (209)
Total gains (losses) on total assets at fair value (6,490)
Single-Family [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total gains (losses) on acquired property, net (2,639)
Single-Family [Member] | Fannie Mae [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total gains (losses) on mortgage loans held for investment (3,077)
Single-Family [Member] | Consolidated Trusts [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total gains (losses) on mortgage loans held for investment (142)
Multifamily [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total gains (losses) on acquired property, net (87)
Multifamily [Member] | Fannie Mae [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Total gains (losses) on mortgage loans held for investment (348)
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 Held-for-sale, Fair Value Disclosure, Duration Approach 0
Other Assets, Fair Value Disclosure, Duration Approach 0
Assets, Fair Value Disclosure, Duration Approach 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]  
Real Estate Acquired through Foreclosure, Fair Value Disclosure, Duration Approach 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]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 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]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 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]  
Real Estate Acquired through Foreclosure, Fair Value Disclosure, Duration Approach 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]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 0
Significant Other Observable Inputs (Level 2) [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Mortgages Held-for-sale, Fair Value Disclosure, Duration Approach 3
Other Assets, Fair Value Disclosure, Duration Approach 0
Assets, Fair Value Disclosure, Duration Approach 3
Significant Other Observable Inputs (Level 2) [Member] | Single-Family [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Real Estate Acquired through Foreclosure, Fair Value Disclosure, Duration Approach 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]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 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]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 0
Significant Other Observable Inputs (Level 2) [Member] | Multifamily [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Real Estate Acquired through Foreclosure, Fair Value Disclosure, Duration Approach 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]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 0
Significant Unobservable Inputs (Level 3) [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Mortgages Held-for-sale, Fair Value Disclosure, Duration Approach 197
Other Assets, Fair Value Disclosure, Duration Approach 1,537
Assets, Fair Value Disclosure, Duration Approach 68,979
Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Real Estate Acquired through Foreclosure, Fair Value Disclosure, Duration Approach 19,498
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]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 44,592
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]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 882
Significant Unobservable Inputs (Level 3) [Member] | Multifamily [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Real Estate Acquired through Foreclosure, Fair Value Disclosure, Duration Approach 363
Significant Unobservable Inputs (Level 3) [Member] | Multifamily [Member] | Fannie Mae [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 1,910
Estimated Fair Value [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Mortgages Held-for-sale, Fair Value Disclosure, Duration Approach 200 [1]
Other Assets, Fair Value Disclosure, Duration Approach 1,537 [2]
Assets, Fair Value Disclosure, Duration Approach 68,982
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 Held-for-sale, Fair Value Disclosure, Duration Approach 73
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 8,100
Real Estate Acquired through Foreclosure, Fair Value Disclosure, Duration Approach 14,500
Other Assets, Fair Value Disclosure, Duration Approach 411
Estimated Fair Value [Member] | Single-Family [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Real Estate Acquired through Foreclosure, Fair Value Disclosure, Duration Approach 19,498 [3]
Estimated Fair Value [Member] | Single-Family [Member] | Fannie Mae [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 44,592 [4]
Estimated Fair Value [Member] | Single-Family [Member] | Consolidated Trusts [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach 882 [4]
Estimated Fair Value [Member] | Multifamily [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Real Estate Acquired through Foreclosure, Fair Value Disclosure, Duration Approach 363 [3]
Estimated Fair Value [Member] | Multifamily [Member] | Fannie Mae [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Loan Held-for-investment, Fair Value Disclosure, Duration Approach $ 1,910 [4]
[1] Includes $73 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 December 31, 2011.
[2] Includes $411 million of other assets that were sold or transferred as of December 31, 2011.
[3] Includes $14.5 billion of acquired properties that were sold or transferred as of December 31, 2011.
[4] Includes $8.1 billion of mortgage loans held for investment that were liquidated or transferred to foreclosed properties as of December 31, 2011.