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Fair Value Level 3 Valuation - Nonrecurring (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Consolidated Trusts [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment $ 14,268 $ 10,800
Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for sale, at lower of cost or fair value 195 208
Mortgage loans held for investment 392,355 466,594
Total assets at fair value 415,630 495,561
Significant Unobservable Inputs (Level 3) [Member] | Fannie Mae [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment 215,960 232,170
Significant Unobservable Inputs (Level 3) [Member] | Consolidated Trusts [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment 176,395 234,424
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for sale, at lower of cost or fair value 132 135
Other assets 121 384
Total assets at fair value 25,970 29,450
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Proprietary home price model and appraisals [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Number of properties measured 81.00% 78.00%
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Consensus Without Inputs [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for sale, at lower of cost or fair value 132 135
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Internal Model [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 81 203
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Appraisals [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 26 8
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Walk Forwards [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 9 43
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Valuation Technique [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 5 130
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Accepted Offers [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Number of properties measured 16.00% 20.00%
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 4,041 3,692
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member] | Internal Model [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 1,049 1,014
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member] | Appraisals [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 1,077 467
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member] | Walk Forwards [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 1,106 1,348
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member] | Other Valuation Technique [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 118 76
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member] | Accepted Offers [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 691 787
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member] | Fannie Mae [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment 19,966 [1] 23,314 [2]
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member] | Fannie Mae [Member] | Internal Model [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment 19,966 23,314
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member] | Consolidated Trusts [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment 79 [1] 227 [2]
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-Family [Member] | Consolidated Trusts [Member] | Internal Model [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment 79 227
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Multifamily [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment 1,533 1,624
Acquired property, net 98 74
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Multifamily [Member] | Appraisals [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment 39 194
Acquired property, net 65 8
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Multifamily [Member] | Broker Price Opinions [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment 248 395
Acquired property, net 9 46
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Multifamily [Member] | Asset Manager Estimate [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment 1,230 1,001
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Multifamily [Member] | Other Valuation Technique [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment 16 34
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Multifamily [Member] | Accepted Offers [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net $ 24 $ 20
[1] Excludes estimated recoveries from mortgage insurance proceeds.
[2] 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.