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Indebtedness - Advance and Warehouse Facilities Summary (Details) - USD ($)
 6 Months Ended
Jun. 30, 2021
Jul. 01, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Advance and warehouse facilities, net $ 7,310,000,000   $ 6,258,000,000
Servicing | MSR      
Debt Instrument [Line Items]      
Collateral Pledged 1,907,000,000   1,217,000,000
Advance and warehouse facilities, net 270,000,000   270,000,000
Originations | Mortgage loans held for sale      
Debt Instrument [Line Items]      
Collateral Pledged 6,741,000,000   5,447,000,000
Advance and warehouse facilities, net 6,470,000,000   5,330,000,000
Advance Facilities | Servicing | Loans payable | $875 advance facility      
Debt Instrument [Line Items]      
Capacity Amount 875,000,000    
Debt outstanding, gross 143,000,000   168,000,000
Collateral Pledged $ 168,000,000   195,000,000
Advance Facilities | Servicing | Loans payable | $875 advance facility | CP rate | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 2.00%    
Advance Facilities | Servicing | Loans payable | $875 advance facility | CP rate | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 6.50%    
Advance Facilities | Servicing | Loans payable | $425 advance facility      
Debt Instrument [Line Items]      
Capacity Amount $ 425,000,000    
Debt outstanding, gross 167,000,000   192,000,000
Collateral Pledged $ 219,000,000   246,000,000
Advance Facilities | Servicing | Loans payable | $425 advance facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.70%    
Advance Facilities | Servicing | Loans payable | $425 advance facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 6.50%    
Advance Facilities | Servicing | Notes payable to banks      
Debt Instrument [Line Items]      
Debt outstanding, gross $ 577,000,000   669,000,000
Collateral Pledged 720,000,000   844,000,000
Advance Facilities | Servicing | Notes payable to banks | $100 advance facility      
Debt Instrument [Line Items]      
Capacity Amount 100,000,000    
Debt outstanding, gross 66,000,000   74,000,000
Collateral Pledged $ 69,000,000   98,000,000
Advance Facilities | Servicing | Notes payable to banks | $100 advance facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 2.50%    
Warehouse Facilities | Originations | Notes payable to banks      
Debt Instrument [Line Items]      
Debt outstanding, gross $ 6,470,000,000   5,330,000,000
Collateral Pledged 6,741,000,000   5,447,000,000
Warehouse Facilities | Originations | Notes payable to banks | $2,000 warehouse facility(3)      
Debt Instrument [Line Items]      
Capacity Amount 2,000,000,000 $ 4,000,000,000  
Debt outstanding, gross 1,968,000,000   339,000,000
Collateral Pledged $ 2,124,000,000   392,000,000
Warehouse Facilities | Originations | Notes payable to banks | $2,000 warehouse facility(3) | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.50%    
Warehouse Facilities | Originations | Notes payable to banks | $2,000 warehouse facility(3) | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 1.80%    
Warehouse Facilities | Originations | Notes payable to banks | $1,500 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 1,500,000,000    
Debt outstanding, gross 607,000,000   1,081,000,000
Collateral Pledged $ 584,000,000   1,028,000,000
Warehouse Facilities | Originations | Notes payable to banks | $1,500 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 1.50%    
Warehouse Facilities | Originations | Notes payable to banks | $2,500 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 2,500,000,000   1,500,000,000
Debt outstanding, gross 1,374,000,000   1,003,000,000
Collateral Pledged $ 1,424,000,000   1,037,000,000
Warehouse Facilities | Originations | Notes payable to banks | $2,500 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.60%    
Warehouse Facilities | Originations | Notes payable to banks | $2,500 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 1.90%    
Warehouse Facilities | Originations | Notes payable to banks | $1,350 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 1,350,000,000    
Debt outstanding, gross 1,018,000,000   951,000,000
Collateral Pledged $ 1,065,000,000   977,000,000
Warehouse Facilities | Originations | Notes payable to banks | $1,350 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.80%    
Warehouse Facilities | Originations | Notes payable to banks | $1,350 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 3.90%    
Warehouse Facilities | Originations | Notes payable to banks | $1,200 warehouse facility(5)      
Debt Instrument [Line Items]      
Capacity Amount $ 1,200,000,000    
Debt outstanding, gross 293,000,000   586,000,000
Collateral Pledged $ 303,000,000   607,000,000
Warehouse Facilities | Originations | Notes payable to banks | $1,200 warehouse facility(5) | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.80%    
Warehouse Facilities | Originations | Notes payable to banks | $1,200 warehouse facility(5) | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 3.00%    
Warehouse Facilities | Originations | Notes payable to banks | $750 million warehouse      
Debt Instrument [Line Items]      
Capacity Amount $ 750,000,000    
Debt outstanding, gross 303,000,000   562,000,000
Collateral Pledged $ 313,000,000   574,000,000
Warehouse Facilities | Originations | Notes payable to banks | $750 million warehouse | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.70%    
Warehouse Facilities | Originations | Notes payable to banks | $750 million warehouse | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 2.80%    
Warehouse Facilities | Originations | Notes payable to banks | $750 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 750,000,000    
Debt outstanding, gross 400,000,000   477,000,000
Collateral Pledged $ 412,000,000   492,000,000
Warehouse Facilities | Originations | Notes payable to banks | $750 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.80%    
Warehouse Facilities | Originations | Notes payable to banks | $750 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 2.30%    
Warehouse Facilities | Originations | Notes payable to banks | $600 warehouse facility(5)      
Debt Instrument [Line Items]      
Capacity Amount $ 600,000,000    
Debt outstanding, gross 77,000,000   0
Collateral Pledged $ 78,000,000   0
Warehouse Facilities | Originations | Notes payable to banks | $600 warehouse facility(5) | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 2.50%    
Warehouse Facilities | Originations | Notes payable to banks | $500 warehouse facility(5)      
Debt Instrument [Line Items]      
Capacity Amount $ 500,000,000    
Debt outstanding, gross 146,000,000   0
Collateral Pledged $ 145,000,000   0
Warehouse Facilities | Originations | Notes payable to banks | $500 warehouse facility(5) | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.50%    
Warehouse Facilities | Originations | Notes payable to banks | $500 warehouse facility(5) | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 4.00%    
Warehouse Facilities | Originations | Notes payable to banks | $300 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 300,000,000    
Debt outstanding, gross 93,000,000   163,000,000
Collateral Pledged $ 94,000,000   164,000,000
Warehouse Facilities | Originations | Notes payable to banks | $300 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 1.40%    
Warehouse Facilities | Originations | Notes payable to banks | $200 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 200,000,000    
Debt outstanding, gross 180,000,000   131,000,000
Collateral Pledged $ 184,000,000   134,000,000
Warehouse Facilities | Originations | Notes payable to banks | $200 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 1.80%    
Warehouse Facilities | Originations | Notes payable to banks | $50 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 50,000,000    
Debt outstanding, gross 11,000,000   37,000,000
Collateral Pledged $ 15,000,000   42,000,000
Warehouse Facilities | Originations | Notes payable to banks | $50 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.80%    
Warehouse Facilities | Originations | Notes payable to banks | $50 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 4.80%    
Warehouse Facilities | Originations | Notes payable to banks | $30 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 30,000,000   40,000,000
Debt outstanding, gross 0   0
Collateral Pledged $ 0   0
Warehouse Facilities | Originations | Notes payable to banks | $30 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 3.30%    
Warehouse Facilities | Originations | Notes payable to banks | $1,500 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 1,500,000,000    
Warehouse Facilities | Originations | Notes payable to banks | $500 Million Warehouse Facility Due June 2023      
Debt Instrument [Line Items]      
Capacity Amount 500,000,000    
Debt outstanding, gross 0   0
Collateral Pledged $ 0   0
Warehouse Facilities | Originations | Notes payable to banks | $500 Million Warehouse Facility Due June 2023 | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.50%    
Warehouse Facilities | Originations | Notes payable to banks | $500 Million Warehouse Facility Due June 2023 | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 3.00%    
MSR Facilities | Servicing | Notes payable to banks      
Debt Instrument [Line Items]      
Debt outstanding, gross $ 270,000,000   270,000,000
Collateral Pledged 1,907,000,000   1,217,000,000
MSR Facilities | Servicing | Notes payable to banks | $200 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount 200,000,000    
Debt outstanding, gross 0   0
Collateral Pledged $ 517,000,000   247,000,000
MSR Facilities | Servicing | Notes payable to banks | $200 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 3.50%    
MSR Facilities | Servicing | Notes payable to banks | $150 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 150,000,000    
Debt outstanding, gross 0   0
Collateral Pledged $ 453,000,000   228,000,000
MSR Facilities | Servicing | Notes payable to banks | $150 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 3.80%    
MSR Facilities | Servicing | Notes payable to banks | $50 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 50,000,000    
Debt outstanding, gross 10,000,000   10,000,000
Collateral Pledged $ 72,000,000   74,000,000
MSR Facilities | Servicing | Notes payable to banks | $50 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 3.30%    
MSR Facilities | Originations | Notes payable to banks | $900 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 900,000,000    
Advance Financing, Internally Allocated | Servicing | Loans payable | $640 advance facility      
Debt Instrument [Line Items]      
Capacity Amount 640,000,000    
Debt outstanding, gross 201,000,000   235,000,000
Collateral Pledged $ 264,000,000   305,000,000
Advance Financing, Internally Allocated | Servicing | Loans payable | $640 advance facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 3.90%    
MSR Financing, Internally Allocated | Servicing | Notes payable to banks | $260 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 260,000,000    
Debt outstanding, gross 260,000,000   260,000,000
Collateral Pledged $ 865,000,000   668,000,000
MSR Financing, Internally Allocated | Servicing | Notes payable to banks | $260 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 3.90%    
MSR Financing, Internally Allocated | Originations | Notes payable to banks | $260 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 260,000,000    
Advance, Warehouse and MSR Facilities      
Debt Instrument [Line Items]      
Debt outstanding, gross 7,317,000,000   6,269,000,000
Collateral Pledged 9,368,000,000   7,508,000,000
Unamortized debt issuance costs (7,000,000)   (11,000,000)
Advance and warehouse facilities, net $ 7,310,000,000   $ 6,258,000,000