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Fair Value - Level 3 Valuation - Nonrecurring (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, net of allowance for loan losses $ 5,616 $ 6,490
Significant Other Observable Inputs (Level 2)    
Fair Value Inputs, Quantitative Information [Line Items]    
Total nonrecurring assets at fair value 3,794,016 3,578,668
Mortgage loans held-for-sale, at lower of cost or fair value 1,858 116
Mortgage loans held for investment, net of allowance for loan losses 3,688,808 3,512,672
Significant Unobservable Inputs (Level 3)    
Fair Value Inputs, Quantitative Information [Line Items]    
Total nonrecurring assets at fair value 241,668 262,442
Mortgage loans held-for-sale, at lower of cost or fair value 5,977 5,502
Mortgage loans held for investment, net of allowance for loan losses 234,637 255,556
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Inputs, Quantitative Information [Line Items]    
Total nonrecurring assets at fair value 168,056 227,635
Mortgage loans held-for-sale, at lower of cost or fair value 0 0
Mortgage loans held for investment, net of allowance for loan losses 0 0
Nonrecurring | Significant Other Observable Inputs (Level 2)    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held-for-sale, at lower of cost or fair value 241 25
Liabilities, Fair Value Disclosure 0 0
Nonrecurring | Significant Unobservable Inputs (Level 3)    
Fair Value Inputs, Quantitative Information [Line Items]    
Total nonrecurring assets at fair value 1,923 2,742
Mortgage loans held-for-sale, at lower of cost or fair value 941 1,087
Nonrecurring | Significant Unobservable Inputs (Level 3) | Consensus    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held-for-sale, at lower of cost or fair value 557 754
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single Vendor    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held-for-sale, at lower of cost or fair value 384 333
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single-Family    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 133 261
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single-Family | Various    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 7 11
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single-Family | Accepted Offers    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 12 35
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single-Family | Appraisals    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 44 89
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single-Family | Internal Model    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, net of allowance for loan losses 562 979
Acquired property, net 53 41
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single-Family | Walk Forwards    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 17 85
Nonrecurring | Significant Unobservable Inputs (Level 3) | Multifamily    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, net of allowance for loan losses 269 390
Nonrecurring | Significant Unobservable Inputs (Level 3) | Multifamily | Various    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, net of allowance for loan losses 77 40
Acquired property, net 18 25
Nonrecurring | Significant Unobservable Inputs (Level 3) | Multifamily | Appraisals    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, net of allowance for loan losses 56 225
Nonrecurring | Significant Unobservable Inputs (Level 3) | Multifamily | Internal Model    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, net of allowance for loan losses 136 125
Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Inputs, Quantitative Information [Line Items]    
Total nonrecurring assets at fair value $ 0 $ 0