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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

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