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Fair Value Level 3 Valuation - Nonrecurring (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value $ 11,683 $ 12,057
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held-for-sale, at lower of cost or fair value 1,388 509
Mortgage loans held for investment, at fair value 2,803,139 2,767,813
Total assets at fair value 2,880,520 2,844,940
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 4,155 2,751
Mortgage loans held for investment, at fair value 312,761 316,742
Total assets at fair value 321,025 323,739
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held-for-sale, at lower of cost or fair value 485 250
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 2,555 1,088
Total assets at fair value 5,983 5,906
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 2,468 1,025
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single Vendor Without Inputs [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held-for-sale, at lower of cost or fair value 84 54
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Various Valuation Technique without Inputs [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held-for-sale, at lower of cost or fair value 3 9
Other assets $ 2 $ 12
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Accepted Offers [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Number of Acquired Properties Valuated, Percentage 22.00% 19.00%
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 Acquired Properties Valuated, Percentage 72.00% 75.00%
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-family [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net $ 1,403 $ 1,792
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-family [Member] | Various Valuation Technique without Inputs [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 62 99
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-family [Member] | Internal Model [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 1,907 2,816
Acquired property, net 322 476
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 300 340
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 511 571
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 208 306
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, at fair value 98 198
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Multifamily [Member] | Various Valuation Technique without Inputs [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value 4 3
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, at fair value 0 25
Acquired property, net 18 0
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, at fair value $ 94 $ 170