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Business Segment Reporting - Financial Information (Details) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Jul. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) segment | Dec. 31, 2018 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  | 4 |
Revenues: |  |  |  |  |  |
Service related, net |  | $ 259 | $ 258 |  | $ 479 |
Net gain on mortgage loans held for sale |  | 83 | 360 |  | 788 |
Total revenues |  | 342 | 618 |  | 1,267 |
Total Expenses |  | 275 | 478 |  | 1,413 |
Other income (expenses) |  |  |  |  |  |
Interest income |  | 90 | 163 |  | 459 |
Interest expense |  | (122) | (196) |  | (572) |
Other |  | 6 | 0 |  | 16 |
Total other income (expenses), net |  | (26) | (33) |  | (97) |
Income (loss) before income tax expense (benefit) |  | 41 | 107 |  | (243) |
Depreciation and amortization for property and equipment and intangible assets |  | 15 | 22 |  | 67 |
Total assets |  | 17,728 | 18,478 |  | 18,478 | $ 16,973
Servicing Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Net gain on mortgage loans held for sale |  |  |  |  | 90 |
Operating Segments |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net |  | 259 | 258 |  | 479 |
Net gain on mortgage loans held for sale |  | 83 | 349 |  | 777 |
Total revenues |  | 342 | 607 |  | 1,256 |
Total Expenses |  | 241 | 425 |  | 1,258 |
Other income (expenses) |  |  |  |  |  |
Interest income |  | 88 | 161 |  | 452 |
Interest expense |  | (85) | (144) |  | (410) |
Other |  | 6 | 2 |  | 18 |
Total other income (expenses), net |  | 9 | 19 |  | 60 |
Income (loss) before income tax expense (benefit) |  | 110 | 201 |  | 58 |
Depreciation and amortization for property and equipment and intangible assets |  | 8 | 13 |  | 37 |
Total assets |  | 15,983 | 16,364 |  | 16,364 |
Operating Segments | Servicing Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net |  | 183 | 163 |  | 198 |
Net gain on mortgage loans held for sale |  | 0 | 0 |  | 0 |
Total revenues |  | 183 | 163 |  | 198 |
Total Expenses |  | 104 | 171 |  | 555 |
Other income (expenses) |  |  |  |  |  |
Interest income |  | 78 | 137 |  | 388 |
Interest expense |  | (74) | (120) |  | (343) |
Other |  | 5 | 0 |  | 0 |
Total other income (expenses), net |  | 9 | 17 |  | 45 |
Income (loss) before income tax expense (benefit) |  | 88 | 9 |  | (312) |
Depreciation and amortization for property and equipment and intangible assets |  | 4 | 5 |  | 13 |
Total assets |  | 14,166 | 12,049 |  | 12,049 |
Operating Segments | Originations Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net |  | 10 | 22 |  | 57 |
Net gain on mortgage loans held for sale |  | 76 | 312 |  | 687 |
Total revenues |  | 86 | 334 |  | 744 |
Total Expenses |  | 66 | 155 |  | 404 |
Other income (expenses) |  |  |  |  |  |
Interest income |  | 10 | 24 |  | 64 |
Interest expense |  | (10) | (24) |  | (67) |
Other |  | 1 | (1) |  | 4 |
Total other income (expenses), net |  | 1 | (1) |  | 1 |
Income (loss) before income tax expense (benefit) |  | 21 | 178 |  | 341 |
Depreciation and amortization for property and equipment and intangible assets |  | 2 | 4 |  | 13 |
Total assets |  | 4,892 | 8,450 |  | 8,450 |
Operating Segments | Xome Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net |  | 73 | 112 |  | 316 |
Net gain on mortgage loans held for sale |  | 0 | 0 |  | 0 |
Total revenues |  | 73 | 112 |  | 316 |
Total Expenses |  | 71 | 101 |  | 301 |
Other income (expenses) |  |  |  |  |  |
Interest income |  | 0 | 0 |  | 0 |
Interest expense |  | (1) | 0 |  | 0 |
Other |  | 0 | 3 |  | 14 |
Total other income (expenses), net |  | (1) | 3 |  | 14 |
Income (loss) before income tax expense (benefit) |  | 1 | 14 |  | 29 |
Depreciation and amortization for property and equipment and intangible assets |  | 2 | 4 |  | 11 |
Total assets |  | 457 | 515 |  | 515 |
Eliminations/Reclassification |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net |  | (7) | (39) |  | (92) |
Net gain on mortgage loans held for sale |  | 7 | 37 |  | 90 |
Total revenues |  | 0 | (2) |  | (2) |
Total Expenses |  | 0 | (2) |  | (2) |
Other income (expenses) |  |  |  |  |  |
Interest income |  | 0 | 0 |  | 0 |
Interest expense |  | 0 | 0 |  | 0 |
Other |  | 0 | 0 |  | 0 |
Total other income (expenses), net |  | 0 | 0 |  | 0 |
Income (loss) before income tax expense (benefit) |  | 0 | 0 |  | 0 |
Depreciation and amortization for property and equipment and intangible assets |  | 0 | 0 |  | 0 |
Total assets |  | (3,532) | (4,650) |  | (4,650) |
Corporate/Other |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net |  | 0 | 0 |  | 0 |
Net gain on mortgage loans held for sale |  | 0 | 11 |  | 11 |
Total revenues |  | 0 | 11 |  | 11 |
Total Expenses |  | 34 | 53 |  | 155 |
Other income (expenses) |  |  |  |  |  |
Interest income |  | 2 | 2 |  | 7 |
Interest expense |  | (37) | (52) |  | (162) |
Other |  | 0 | (2) |  | (2) |
Total other income (expenses), net |  | (35) | (52) |  | (157) |
Income (loss) before income tax expense (benefit) |  | (69) | (94) |  | (301) |
Depreciation and amortization for property and equipment and intangible assets |  | 7 | 9 |  | 30 |
Total assets |  | $ 1,745 | $ 2,114 |  | $ 2,114 |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net | $ 120 |  |  | $ 901 |  |
Net gain on mortgage loans held for sale | 44 |  |  | 295 |  |
Total revenues | 164 |  |  | 1,196 |  |
Total Expenses | 242 |  |  | 945 |  |
Other income (expenses) |  |  |  |  |  |
Interest income | 48 |  |  | 333 |  |
Interest expense | (53) |  |  | (388) |  |
Other | 0 |  |  | 6 |  |
Total other income (expenses), net | (5) |  |  | (49) |  |
Income (loss) before income tax expense (benefit) | (83) |  |  | 202 |  |
Depreciation and amortization for property and equipment and intangible assets | 4 |  |  | 33 |  |
Total assets | 17,026 |  |  | 17,026 |  |
Nationstar Mortgage Holdings Inc. | Operating Segments |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net | 120 |  |  | 900 |  |
Net gain on mortgage loans held for sale | 44 |  |  | 295 |  |
Total revenues | 164 |  |  | 1,195 |  |
Total Expenses | 179 |  |  | 842 |  |
Other income (expenses) |  |  |  |  |  |
Interest income | 47 |  |  | 326 |  |
Interest expense | (41) |  |  | (305) |  |
Other | 0 |  |  | 8 |  |
Total other income (expenses), net | 6 |  |  | 29 |  |
Income (loss) before income tax expense (benefit) | (9) |  |  | 382 |  |
Depreciation and amortization for property and equipment and intangible assets | 4 |  |  | 29 |  |
Total assets | 16,113 |  |  | 16,113 |  |
Nationstar Mortgage Holdings Inc. | Operating Segments | Servicing Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net | 97 |  |  | 740 |  |
Net gain on mortgage loans held for sale | 0 |  |  | 0 |  |
Total revenues | 97 |  |  | 740 |  |
Total Expenses | 126 |  |  | 474 |  |
Other income (expenses) |  |  |  |  |  |
Interest income | 41 |  |  | 288 |  |
Interest expense | (35) |  |  | (268) |  |
Other | 0 |  |  | (1) |  |
Total other income (expenses), net | 6 |  |  | 19 |  |
Income (loss) before income tax expense (benefit) | (23) |  |  | 285 |  |
Depreciation and amortization for property and equipment and intangible assets | 2 |  |  | 15 |  |
Total assets | 14,578 |  |  | 14,578 |  |
Nationstar Mortgage Holdings Inc. | Operating Segments | Originations Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net | 4 |  |  | 36 |  |
Net gain on mortgage loans held for sale | 41 |  |  | 270 |  |
Total revenues | 45 |  |  | 306 |  |
Total Expenses | 34 |  |  | 245 |  |
Other income (expenses) |  |  |  |  |  |
Interest income | 6 |  |  | 38 |  |
Interest expense | (6) |  |  | (37) |  |
Other | 0 |  |  | 0 |  |
Total other income (expenses), net | 0 |  |  | 1 |  |
Income (loss) before income tax expense (benefit) | 11 |  |  | 62 |  |
Depreciation and amortization for property and equipment and intangible assets | 1 |  |  | 7 |  |
Total assets | 4,701 |  |  | 4,701 |  |
Nationstar Mortgage Holdings Inc. | Operating Segments | Xome Segment |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net | 22 |  |  | 149 |  |
Net gain on mortgage loans held for sale | 0 |  |  | 0 |  |
Total revenues | 22 |  |  | 149 |  |
Total Expenses | 19 |  |  | 123 |  |
Other income (expenses) |  |  |  |  |  |
Interest income | 0 |  |  | 0 |  |
Interest expense | 0 |  |  | 0 |  |
Other | 0 |  |  | 9 |  |
Total other income (expenses), net | 0 |  |  | 9 |  |
Income (loss) before income tax expense (benefit) | 3 |  |  | 35 |  |
Depreciation and amortization for property and equipment and intangible assets | 1 |  |  | 7 |  |
Total assets | 425 |  |  | 425 |  |
Nationstar Mortgage Holdings Inc. | Eliminations/Reclassification |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net | (3) |  |  | (25) |  |
Net gain on mortgage loans held for sale | 3 |  |  | 25 |  |
Total revenues | 0 |  |  | 0 |  |
Total Expenses | 0 |  |  | 0 |  |
Other income (expenses) |  |  |  |  |  |
Interest income | 0 |  |  | 0 |  |
Interest expense | 0 |  |  | 0 |  |
Other | 0 |  |  | 0 |  |
Total other income (expenses), net | 0 |  |  | 0 |  |
Income (loss) before income tax expense (benefit) | 0 |  |  | 0 |  |
Depreciation and amortization for property and equipment and intangible assets | 0 |  |  | 0 |  |
Total assets | (3,591) |  |  | (3,591) |  |
Nationstar Mortgage Holdings Inc. | Corporate/Other |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Service related, net | 0 |  |  | 1 |  |
Net gain on mortgage loans held for sale | 0 |  |  | 0 |  |
Total revenues | 0 |  |  | 1 |  |
Total Expenses | 63 |  |  | 103 |  |
Other income (expenses) |  |  |  |  |  |
Interest income | 1 |  |  | 7 |  |
Interest expense | (12) |  |  | (83) |  |
Other | 0 |  |  | (2) |  |
Total other income (expenses), net | (11) |  |  | (78) |  |
Income (loss) before income tax expense (benefit) | (74) |  |  | (180) |  |
Depreciation and amortization for property and equipment and intangible assets | 0 |  |  | 4 |  |
Total assets | $ 913 |  |  | $ 913 |  |

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