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Fair Value Level 3 Valuation - Nonrecurring (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
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 $ 210 $ 195
Mortgage loans held for investment, at fair value 389,199 392,355
Total assets at fair value 409,718 415,630
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for sale, at lower of cost or fair value 151 132
Other assets 39 121
Total assets at fair value 22,465 25,970
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 218,495 215,960
Consolidated Trusts [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 15,262 14,268
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 170,704 176,395
Single-Family [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 4,544 4,041
Single-Family [Member] | Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 16,771 [1] 19,966 [1]
Single-Family [Member] | Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 56 [1] 79 [1]
Multifamily [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 747 1,533
Acquired property, net 157 98
Proprietary Home Price Model and Appraisals [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Number of Acquired Properties Valuated, Percentage 78.00% 81.00%
Consensus without Inputs [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for sale, at lower of cost or fair value 113 132
Build-Up [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for sale, at lower of cost or fair value 38 0
Internal Model [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 32 81
Internal Model [Member] | Single-Family [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 909 1,049
Internal Model [Member] | Single-Family [Member] | Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 16,771 19,966
Internal Model [Member] | Single-Family [Member] | Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 56 79
Appraisals [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 2 26
Appraisals [Member] | Single-Family [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 1,611 1,077
Appraisals [Member] | Multifamily [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 16 39
Acquired property, net 66 65
Walk Forwards [Member] | Single-Family [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 1,054 1,106
Broker Price Opinions [Member] | Multifamily [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 100 248
Acquired property, net 86 9
Asset Manager Estimate [Member] | Multifamily [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 631 1,230
Other Valuation Technique [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Other assets 5 14
Other Valuation Technique [Member] | Single-Family [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 125 118
Other Valuation Technique [Member] | Multifamily [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 0 16
Accepted Offers [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Number of Acquired Properties Valuated, Percentage 19.00% 16.00%
Accepted Offers [Member] | Single-Family [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 845 691
Accepted Offers [Member] | Multifamily [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
   
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net $ 5 $ 24
[1] Excludes estimated recoveries from mortgage insurance proceeds.