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Fair Value - Level 3 Valuation - Nonrecurring (Details) - USD ($)
Sep. 30, 2022
Dec. 31, 2021
Fair Value Inputs, Quantitative Information [Line Items]    
Mortgage loans held for investment, net of allowance for loan losses $ 3,691,000,000 $ 4,964,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Inputs, Quantitative Information [Line Items]    
Total nonrecurring assets at fair value 95,148,000,000 148,112,000,000
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 3,427,472,000,000 3,875,259,000,000
Mortgage loans held-for-sale, at lower of cost or fair value 877,000,000 178,000,000
Mortgage loans held for investment, net of allowance for loan losses 3,371,881,000,000 3,796,917,000,000
Significant Unobservable Inputs (Level 3)    
Fair Value Inputs, Quantitative Information [Line Items]    
Total nonrecurring assets at fair value 173,848,000,000 215,567,000,000
Mortgage loans held-for-sale, at lower of cost or fair value 3,513,000,000 5,307,000,000
Mortgage loans held for investment, net of allowance for loan losses 169,412,000,000 209,090,000,000
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 282,000,000 38,000,000
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 4,624,000,000 2,872,000,000
Mortgage loans held-for-sale, at lower of cost or fair value 2,991,000,000 1,584,000,000
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 1,822,000,000 201,000,000
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 1,169,000,000 1,383,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single Family    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 281,000,000 209,000,000
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 1,216,000,000 867,000,000
Acquired property, net 117,000,000 75,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single Family | Appraisal    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 89,000,000 73,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single Family | Accepted Offer    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 14,000,000 13,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single Family | Walk Forward    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 48,000,000 37,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Single Family | Various    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net 13,000,000 11,000,000
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 130,000,000 178,000,000
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 53,000,000 23,000,000
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 8,000,000 37,000,000
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 69,000,000 118,000,000
Nonrecurring | Significant Unobservable Inputs (Level 3) | Multifamily | Various    
Fair Value Inputs, Quantitative Information [Line Items]    
Acquired property, net $ 6,000,000 $ 34,000,000