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Indebtedness - Notes Payable Summary (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Apr. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Debt Outstanding $ 489,000,000   $ 422,000,000
Originations Segment | Mortgage servicing rights      
Debt Instrument [Line Items]      
Capacity Amount 150,000,000    
Originations Segment | Mortgage loans, net      
Debt Instrument [Line Items]      
Debt Outstanding 3,659,000,000   3,826,000,000
Collateral Pledged 3,748,000,000   3,931,000,000
Originations Segment | Reverse mortgage interests      
Debt Instrument [Line Items]      
Debt Outstanding 598,000,000   590,000,000
Collateral Pledged 709,000,000   691,000,000
Originations Segment | MSR      
Debt Instrument [Line Items]      
Debt Outstanding 295,000,000   160,000,000
Collateral Pledged 1,216,000,000   1,359,000,000
Advance Facilities | Servicing Segment      
Debt Instrument [Line Items]      
Debt outstanding, gross 490,000,000   422,000,000
Unamortized debt issuance costs (1,000,000)   0
Debt Outstanding 489,000,000   422,000,000
Collateral Pledged 614,000,000   665,000,000
Advance Facilities | Servicing Segment | Loans Payable | $325 advance facility(1)      
Debt Instrument [Line Items]      
Capacity Amount 325,000,000    
Debt outstanding, gross 223,000,000   224,000,000
Collateral Pledged $ 283,000,000   285,000,000
Advance Facilities | Servicing Segment | Loans Payable | $325 advance facility(1) | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.50%    
Advance Facilities | Servicing Segment | Loans Payable | $325 advance facility(1) | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 6.50%    
Advance Facilities | Servicing Segment | Loans Payable | $250 advance facility(2)      
Debt Instrument [Line Items]      
Capacity Amount $ 250,000,000    
Debt outstanding, gross 118,000,000   98,000,000
Collateral Pledged $ 138,000,000   167,000,000
Advance Facilities | Servicing Segment | Loans Payable | $250 advance facility(2) | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.50%    
Advance Facilities | Servicing Segment | Loans Payable | $250 advance facility(2) | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 2.60%    
Advance Facilities | Servicing Segment | Loans Payable | $125 advance facility(3)      
Debt Instrument [Line Items]      
Capacity Amount $ 125,000,000    
Debt outstanding, gross 66,000,000   37,000,000
Collateral Pledged $ 76,000,000   88,000,000
Advance Facilities | Servicing Segment | Loans Payable | $125 advance facility(3) | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.50%    
Advance Facilities | Servicing Segment | Loans Payable | $125 advance facility(3) | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 7.40%    
Advance Facilities | Servicing Segment | Notes Payable to Banks | $200 advance facility      
Debt Instrument [Line Items]      
Capacity Amount $ 200,000,000    
Debt outstanding, gross 83,000,000   63,000,000
Collateral Pledged $ 117,000,000   125,000,000
Advance Facilities | Servicing Segment | Notes Payable to Banks | $200 advance facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 2.50%    
Warehouse Facilities | Originations Segment      
Debt Instrument [Line Items]      
Debt outstanding, gross $ 4,257,000,000   4,416,000,000
Collateral Pledged 4,457,000,000   4,622,000,000
Warehouse Facilities | Originations Segment | $800 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount 800,000,000    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $1,500 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount 1,500,000,000    
Debt outstanding, gross 1,214,000,000   759,000,000
Collateral Pledged $ 1,160,000,000   733,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $1,500 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 1.00%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $1,200 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 1,200,000,000    
Debt outstanding, gross 566,000,000   683,000,000
Collateral Pledged $ 602,000,000   724,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $1,200 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.50%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $1,200 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 3.00%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $1,000 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 1,000,000,000    
Debt outstanding, gross 593,000,000   762,000,000
Collateral Pledged $ 608,000,000   783,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $1,000 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.40%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $1,000 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 2.30%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $800 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 800,000,000    
Debt outstanding, gross 528,000,000   589,000,000
Collateral Pledged $ 639,000,000   656,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $800 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 2.10%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $800 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 3.80%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $750 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 750,000,000    
Debt outstanding, gross 347,000,000   411,000,000
Collateral Pledged $ 355,000,000   425,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $750 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.40%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $750 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 2.80%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $700 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 700,000,000    
Debt outstanding, gross 628,000,000   469,000,000
Collateral Pledged $ 649,000,000   488,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $700 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 1.30%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $700 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 2.20%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $600 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 600,000,000    
Debt outstanding, gross 169,000,000   174,000,000
Collateral Pledged $ 203,000,000   202,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $600 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 2.00%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $500 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 500,000,000    
Debt outstanding, gross 22,000,000   336,000,000
Collateral Pledged $ 23,000,000   349,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $500 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 2.00%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $500 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 4.00%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $200 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 200,000,000    
Debt outstanding, gross 100,000,000   136,000,000
Collateral Pledged $ 101,000,000   136,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $200 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 1.40%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $200 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 200,000,000    
Debt outstanding, gross 21,000,000   27,000,000
Collateral Pledged $ 21,000,000   27,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $200 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 1.20%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $200 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 200,000,000    
Debt outstanding, gross 59,000,000   54,000,000
Collateral Pledged $ 83,000,000   78,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $200 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 2.00%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $200 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 200,000,000    
Debt outstanding, gross 0   0
Collateral Pledged $ 0   0
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $200 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 1.30%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $50 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 50,000,000    
Debt outstanding, gross 4,000,000   11,000,000
Collateral Pledged $ 6,000,000   15,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $50 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 2.00%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $50 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 6.00%    
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $40 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 40,000,000    
Debt outstanding, gross 6,000,000   5,000,000
Collateral Pledged $ 7,000,000   6,000,000
Warehouse Facilities | Originations Segment | Notes Payable to Banks | $40 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 3.30%    
MSR Facility | Originations Segment      
Debt Instrument [Line Items]      
Debt outstanding, gross $ 295,000,000   160,000,000
Collateral Pledged 1,216,000,000   1,359,000,000
MSR Facility | Originations Segment | Notes Payable to Banks | $400 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount 400,000,000    
Debt outstanding, gross 150,000,000   150,000,000
Collateral Pledged $ 836,000,000   945,000,000
MSR Facility | Originations Segment | Notes Payable to Banks | $400 warehouse facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on rate 3.50%    
MSR Facility | Originations Segment | Notes Payable to Banks | $400 warehouse facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on rate 6.10%    
MSR Facility | Originations Segment | Notes Payable to Banks | $400 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 400,000,000    
Debt outstanding, gross 75,000,000   0
Collateral Pledged $ 190,000,000   200,000,000
MSR Facility | Originations Segment | Notes Payable to Banks | $400 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 2.30%    
MSR Facility | Originations Segment | Notes Payable to Banks | $150 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 150,000,000    
Debt outstanding, gross 40,000,000   0
Collateral Pledged $ 119,000,000   130,000,000
MSR Facility | Originations Segment | Notes Payable to Banks | $150 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 2.80%    
MSR Facility | Originations Segment | Notes Payable to Banks | $50 warehouse facility      
Debt Instrument [Line Items]      
Capacity Amount $ 50,000,000    
Debt outstanding, gross 30,000,000   10,000,000
Collateral Pledged $ 71,000,000   84,000,000
MSR Facility | Originations Segment | Notes Payable to Banks | $50 warehouse facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on rate 2.80%    
Warehouse and MSR Facilities      
Debt Instrument [Line Items]      
Unamortized debt issuance costs $ (1,000,000)   (1,000,000)
Debt Outstanding 4,551,000,000   4,575,000,000
Warehouse and MSR Facilities | Originations Segment      
Debt Instrument [Line Items]      
Debt outstanding, gross 4,552,000,000   4,576,000,000
Collateral Pledged $ 5,673,000,000   $ 5,981,000,000
Subsequent Event | Advance Facilities | Servicing Segment | Loans Payable | $325 advance facility(1)      
Debt Instrument [Line Items]      
Capacity Amount   $ 425,000,000  
Subsequent Event | Advance Facilities | Servicing Segment | Loans Payable | $125 advance facility(3)      
Debt Instrument [Line Items]      
Capacity Amount   $ 875,000,000