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Fair Value Level 3 Valuation - Nonrecurring (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, at fair value $ 6,968 $ 7,825
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 679 229
Mortgage loans held for investment, at fair value 3,414,104 3,270,535
Total assets at fair value 3,462,112 3,313,691
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 8,297 7,054
Mortgage loans held for investment, at fair value 257,448 127,650
Total assets at fair value 267,484 136,048
Fair Value, 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 127 274
Fair Value, 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 1,880 1,076
Total assets at fair value 3,350 2,598
Fair Value, 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 767 605
Fair Value, 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 1,113 471
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-family [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 356 918
Fair Value, 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 15 51
Fair Value, 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 855 555
Acquired property, net 55 164
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-family [Member] | Accepted Offers [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 60 101
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-family [Member] | Appraisals [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 115 362
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Single-family [Member] | Walk Forwards [Member]    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 111 240
Fair Value, 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 232 40
Fair Value, 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 232 16
Acquired property, net 27 9
Fair Value, 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 $ 0 $ 24