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Indebtedness - Notes Payable Summary (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Debt Outstanding $ 596  
Advance facilities    
Debt Instrument [Line Items]    
Unamortized debt issuance costs 0  
Warehouse Facilities    
Debt Instrument [Line Items]    
Unamortized debt issuance costs 0  
Servicing Segment    
Debt Instrument [Line Items]    
Debt Outstanding 596  
Collateral Pledged  
Servicing Segment | Notes Payable, Other    
Debt Instrument [Line Items]    
Debt outstanding, gross 596  
Collateral Pledged 827  
Servicing Segment | Notes Payable, Other | Nationstar agency advance receivables trust    
Debt Instrument [Line Items]    
Capacity Amount 575  
Debt outstanding, gross 232  
Collateral Pledged $ 271  
Servicing Segment | Notes Payable, Other | Nationstar agency advance receivables trust | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on rate 1.90%  
Servicing Segment | Notes Payable, Other | Nationstar agency advance receivables trust | LIBOR | Maximum    
Debt Instrument [Line Items]    
Basis spread on rate 2.60%  
Servicing Segment | Notes Payable, Other | Nationstar mortgage advance receivable trust    
Debt Instrument [Line Items]    
Capacity Amount $ 325  
Debt outstanding, gross 264  
Collateral Pledged $ 333  
Servicing Segment | Notes Payable, Other | Nationstar mortgage advance receivable trust | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on rate 1.50%  
Servicing Segment | Notes Payable, Other | Nationstar mortgage advance receivable trust | LIBOR | Maximum    
Debt Instrument [Line Items]    
Basis spread on rate 6.50%  
Servicing Segment | Notes Payable, Other | Nationstar agency advance financing facility    
Debt Instrument [Line Items]    
Capacity Amount $ 150  
Debt outstanding, gross 67  
Collateral Pledged $ 78  
Servicing Segment | Notes Payable, Other | Nationstar agency advance financing facility | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on rate 1.90%  
Servicing Segment | Notes Payable, Other | Nationstar agency advance financing facility | LIBOR | Maximum    
Debt Instrument [Line Items]    
Basis spread on rate 7.40%  
Servicing Segment | Notes Payable, Other | MBS servicer advance facility (2014)    
Debt Instrument [Line Items]    
Capacity Amount $ 125  
Debt outstanding, gross 33  
Collateral Pledged $ 145  
Servicing Segment | Notes Payable, Other | MBS servicer advance facility (2014) | CPRATE    
Debt Instrument [Line Items]    
Basis spread on rate 3.00%  
Servicing Segment | Notes Payable, Other | MBS advance financing facility    
Debt Instrument [Line Items]    
Capacity Amount $ 0  
Debt outstanding, gross 0  
Collateral Pledged $ 0  
Servicing Segment | Notes Payable, Other | MBS advance financing facility | LIBOR    
Debt Instrument [Line Items]    
Basis spread on rate 2.50%  
Originations Segment    
Debt Instrument [Line Items]    
Debt Outstanding $ 2,888  
Collateral Pledged  
Originations Segment | Mortgage loans, net    
Debt Instrument [Line Items]    
Debt Outstanding 1,595  
Collateral Pledged 1,481  
Originations Segment | Reverse mortgage interests, net    
Debt Instrument [Line Items]    
Debt Outstanding 1,193  
Collateral Pledged 1,342  
Originations Segment | MSR and other collateral    
Debt Instrument [Line Items]    
Debt Outstanding 100  
Collateral Pledged 549  
Originations Segment | Notes Payable to Banks    
Debt Instrument [Line Items]    
Debt outstanding, gross 2,888  
Collateral Pledged 3,372  
Originations Segment | Notes Payable to Banks | $1,200 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount 1,200  
Debt outstanding, gross 664  
Collateral Pledged $ 730  
Originations Segment | Notes Payable to Banks | $1,200 warehouse facility | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on rate 1.90%  
Originations Segment | Notes Payable to Banks | $1,200 warehouse facility | LIBOR | Maximum    
Debt Instrument [Line Items]    
Basis spread on rate 3.80%  
Originations Segment | Notes Payable to Banks | $1,000 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 1,000  
Debt outstanding, gross 220  
Collateral Pledged $ 225  
Originations Segment | Notes Payable to Banks | $1,000 warehouse facility | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on rate 1.60%  
Originations Segment | Notes Payable to Banks | $1,000 warehouse facility | LIBOR | Maximum    
Debt Instrument [Line Items]    
Basis spread on rate 2.50%  
Originations Segment | Notes Payable to Banks | $950 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 950  
Debt outstanding, gross 661  
Collateral Pledged $ 735  
Originations Segment | Notes Payable to Banks | $950 warehouse facility | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on rate 2.00%  
Originations Segment | Notes Payable to Banks | $950 warehouse facility | LIBOR | Maximum    
Debt Instrument [Line Items]    
Basis spread on rate 3.50%  
Originations Segment | Notes Payable to Banks | $600 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 600  
Debt outstanding, gross 263  
Collateral Pledged $ 285  
Originations Segment | Notes Payable to Banks | $600 warehouse facility | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on rate 2.50%  
Originations Segment | Notes Payable to Banks | $500 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 500  
Debt outstanding, gross 160  
Collateral Pledged $ 164  
Originations Segment | Notes Payable to Banks | $500 warehouse facility | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on rate 1.50%  
Originations Segment | Notes Payable to Banks | $500 warehouse facility | LIBOR | Maximum    
Debt Instrument [Line Items]    
Basis spread on rate 2.80%  
Originations Segment | Notes Payable to Banks | $500 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 500  
Debt outstanding, gross 291  
Collateral Pledged $ 320  
Originations Segment | Notes Payable to Banks | $500 warehouse facility | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on rate 1.80%  
Originations Segment | Notes Payable to Banks | $500 warehouse facility | LIBOR | Maximum    
Debt Instrument [Line Items]    
Basis spread on rate 2.80%  
Originations Segment | Notes Payable to Banks | $500 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 500  
Debt outstanding, gross 218  
Collateral Pledged $ 233  
Originations Segment | Notes Payable to Banks | $500 warehouse facility | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on rate 2.00%  
Originations Segment | Notes Payable to Banks | $500 warehouse facility | LIBOR | Maximum    
Debt Instrument [Line Items]    
Basis spread on rate 3.50%  
Originations Segment | Notes Payable to Banks | $300 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 300  
Debt outstanding, gross 89  
Collateral Pledged $ 111  
Originations Segment | Notes Payable to Banks | $300 warehouse facility | LIBOR    
Debt Instrument [Line Items]    
Basis spread on rate 2.30%  
Originations Segment | Notes Payable to Banks | $250 Warehouse Facility    
Debt Instrument [Line Items]    
Capacity Amount $ 250  
Debt outstanding, gross 177  
Collateral Pledged $ 182  
Originations Segment | Notes Payable to Banks | $250 Warehouse Facility | LIBOR | Minimum    
Debt Instrument [Line Items]    
Basis spread on rate 2.00%  
Originations Segment | Notes Payable to Banks | $250 Warehouse Facility | LIBOR | Maximum    
Debt Instrument [Line Items]    
Basis spread on rate 2.30%  
Originations Segment | Notes Payable to Banks | $200 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 200  
Debt outstanding, gross 43  
Collateral Pledged $ 44  
Originations Segment | Notes Payable to Banks | $200 warehouse facility | LIBOR    
Debt Instrument [Line Items]    
Basis spread on rate 1.60%  
Originations Segment | Notes Payable to Banks | $200 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 200  
Debt outstanding, gross 100  
Collateral Pledged $ 198  
Originations Segment | Notes Payable to Banks | $200 warehouse facility | LIBOR    
Debt Instrument [Line Items]    
Basis spread on rate 4.00%  
Originations Segment | Notes Payable to Banks | $150 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 150  
Debt outstanding, gross 0  
Collateral Pledged $ 98  
Originations Segment | Notes Payable to Banks | $150 warehouse facility | LIBOR    
Debt Instrument [Line Items]    
Basis spread on rate 4.30%  
Originations Segment | Notes Payable to Banks | $50 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 50  
Debt outstanding, gross 0  
Collateral Pledged $ 44  
Originations Segment | Notes Payable to Banks | $50 warehouse facility | LIBOR    
Debt Instrument [Line Items]    
Basis spread on rate 4.50%  
Originations Segment | Notes Payable to Banks | $40 warehouse facility    
Debt Instrument [Line Items]    
Capacity Amount $ 40  
Debt outstanding, gross 2  
Collateral Pledged $ 3  
Originations Segment | Notes Payable to Banks | $40 warehouse facility | LIBOR    
Debt Instrument [Line Items]    
Basis spread on rate 3.00%  
Predecessor    
Debt Instrument [Line Items]    
Debt Outstanding   $ 855
Predecessor | Advance facilities    
Debt Instrument [Line Items]    
Unamortized debt issuance costs   0
Predecessor | Warehouse Facilities    
Debt Instrument [Line Items]    
Unamortized debt issuance costs   (1)
Predecessor | Servicing Segment    
Debt Instrument [Line Items]    
Debt Outstanding   855
Collateral Pledged  
Predecessor | Servicing Segment | Notes Payable, Other    
Debt Instrument [Line Items]    
Debt outstanding, gross   855
Collateral Pledged   1,100
Predecessor | Servicing Segment | Notes Payable, Other | Nationstar agency advance receivables trust    
Debt Instrument [Line Items]    
Debt outstanding, gross   416
Collateral Pledged   492
Predecessor | Servicing Segment | Notes Payable, Other | Nationstar mortgage advance receivable trust    
Debt Instrument [Line Items]    
Debt outstanding, gross   230
Collateral Pledged   287
Predecessor | Servicing Segment | Notes Payable, Other | Nationstar agency advance financing facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   102
Collateral Pledged   117
Predecessor | Servicing Segment | Notes Payable, Other | MBS servicer advance facility (2014)    
Debt Instrument [Line Items]    
Debt outstanding, gross   44
Collateral Pledged   140
Predecessor | Servicing Segment | Notes Payable, Other | MBS advance financing facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   63
Collateral Pledged   64
Predecessor | Originations Segment    
Debt Instrument [Line Items]    
Debt Outstanding   3,285
Collateral Pledged  
Predecessor | Originations Segment | Mortgage loans, net    
Debt Instrument [Line Items]    
Debt Outstanding   1,852
Collateral Pledged   1,680
Predecessor | Originations Segment | Reverse mortgage interests, net    
Debt Instrument [Line Items]    
Debt Outstanding   1,434
Collateral Pledged   1,575
Predecessor | Originations Segment | MSR and other collateral    
Debt Instrument [Line Items]    
Debt Outstanding   0
Collateral Pledged   281
Predecessor | Originations Segment | Notes Payable to Banks    
Debt Instrument [Line Items]    
Debt outstanding, gross   3,286
Collateral Pledged   3,536
Predecessor | Originations Segment | Notes Payable to Banks | $1,200 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   889
Collateral Pledged   960
Predecessor | Originations Segment | Notes Payable to Banks | $1,000 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   299
Collateral Pledged   308
Predecessor | Originations Segment | Notes Payable to Banks | $950 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   721
Collateral Pledged   785
Predecessor | Originations Segment | Notes Payable to Banks | $600 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   333
Collateral Pledged   347
Predecessor | Originations Segment | Notes Payable to Banks | $500 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   233
Collateral Pledged   239
Predecessor | Originations Segment | Notes Payable to Banks | $500 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   305
Collateral Pledged   337
Predecessor | Originations Segment | Notes Payable to Banks | $500 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   246
Collateral Pledged   272
Predecessor | Originations Segment | Notes Payable to Banks | $300 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   116
Collateral Pledged   141
Predecessor | Originations Segment | Notes Payable to Banks | $250 Warehouse Facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   0
Collateral Pledged   0
Predecessor | Originations Segment | Notes Payable to Banks | $200 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   80
Collateral Pledged   81
Predecessor | Originations Segment | Notes Payable to Banks | $200 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   50
Collateral Pledged   50
Predecessor | Originations Segment | Notes Payable to Banks | $150 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   0
Collateral Pledged   0
Predecessor | Originations Segment | Notes Payable to Banks | $50 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   10
Collateral Pledged   10
Predecessor | Originations Segment | Notes Payable to Banks | $40 warehouse facility    
Debt Instrument [Line Items]    
Debt outstanding, gross   4
Collateral Pledged   $ 6