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Fair Value - Level 3 Valuation - Nonrecurring (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, net of allowance for loan losses $ 3,599,000,000 $ 3,645,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Inputs, Quantitative Information [Line Items]    
Total nonrecurring assets at fair value 83,774,000,000 79,889,000,000
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
Significant Other Observable Inputs (Level 2)    
Fair Value Inputs, Quantitative Information [Line Items]    
Total nonrecurring assets at fair value 3,576,790,000,000 3,512,490,000,000
Mortgage loans held-for-sale, at lower of cost or fair value 23,000,000 48,000,000
Mortgage loans held for investment, net of allowance for loan losses 3,489,281,000,000 3,437,979,000,000
Significant Unobservable Inputs (Level 3)    
Fair Value Inputs, Quantitative Information [Line Items]    
Total nonrecurring assets at fair value 172,014,000,000 174,762,000,000
Mortgage loans held-for-sale, at lower of cost or fair value 503,000,000 2,029,000,000
Mortgage loans held for investment, net of allowance for loan losses 170,658,000,000 171,857,000,000
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
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 11,000,000 30,000,000
Total nonrecurring liabilities at fair value 0 0
Nonrecurring | Significant Unobservable Inputs (Level 3)    
Fair Value Inputs, Quantitative Information [Line Items]    
Total nonrecurring assets at fair value 2,538,000,000 4,462,000,000
Mortgage loans held-for-sale, at lower of cost or fair value 326,000,000 1,663,000,000
Total nonrecurring liabilities at fair value 0 0
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 205,000,000 1,571,000,000
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 121,000,000 92,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single-Family    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 395,000,000 400,000,000
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 926,000,000 1,636,000,000
Acquired property, net 211,000,000 215,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single-Family | Appraisal    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 43,000,000 65,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single-Family | Accepted Offer    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 23,000,000 17,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single-Family | Walk Forward    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 98,000,000 91,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single-Family | Various    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 20,000,000 12,000,000
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 855,000,000 644,000,000
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 146,000,000 27,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Multifamily | Appraisal    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, net of allowance for loan losses 12,000,000 3,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Multifamily | Broker Price Opinion    
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, net of allowance for loan losses 697,000,000 614,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Multifamily | Various    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net $ 36,000,000 $ 119,000,000