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Business Segment Reporting - Financial Information (Details) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) segment | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  |  |  | 4 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net | $ 120 | $ 259 | $ 430 | $ 258 | $ 137 | $ 84 | $ 159 | $ 317 | $ 464 | $ 418 | $ 901 | $ 909 | $ 1,043
Net gain on mortgage loans held for sale | 44 | 83 | 310 | 360 | 262 | 166 | 93 | 127 | 124 | 176 | 295 | 1,098 | 607
Total revenues | 164 | 342 | 740 | 618 | 399 | 250 | 252 | 444 | 588 | 594 | 1,196 | 2,007 | 1,650
Total expenses | 242 | 275 | 438 | 478 | 492 | 443 | 432 | 339 | 364 | 707 | 945 | 1,851 | 1,475
Other income (expenses), net: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 256 | 333 | 605 | 597
Interest expense |  |  |  |  |  |  |  |  |  | (293) | (388) | (779) | (731)
Other (expenses) income, net |  |  |  |  |  |  |  |  |  | 13 | 6 | 15 | 3
Total other income (expenses), net | (5) | (26) | (62) | (33) | (24) | (40) | 2 | (26) | (18) | (24) | (49) | (159) | (131)
(Loss) income before income tax expense | (83) | $ 41 | 240 | $ 107 | $ (117) | $ (233) | (178) | $ 79 | $ 206 | (137) | 202 | (3) | 44
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 39 | 33 | 91 | 59
Total assets | 17,026 |  | 18,305 |  |  |  | 16,973 |  |  | 16,973 | 17,026 | 18,305 | 18,036
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | 0 | (25) | (3) | (79)
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 0 | 25 | 0 | 79
Total revenues |  |  |  |  |  |  |  |  |  | 0 | 0 | (3) | 0
Total expenses |  |  |  |  |  |  |  |  |  | 0 | 0 | (3) | 0
Other income (expenses), net: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Other (expenses) income, net |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
(Loss) income before income tax expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Total assets | (3,591) |  | (4,826) |  |  |  | (3,772) |  |  | (3,772) | (3,591) | (4,826) | (3,117)
Total Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | 418 | 900 | 907 | 1,041
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 176 | 295 | 1,087 | 607
Total revenues |  |  |  |  |  |  |  |  |  | 594 | 1,195 | 1,994 | 1,648
Total expenses |  |  |  |  |  |  |  |  |  | 636 | 842 | 1,653 | 1,377
Other income (expenses), net: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 249 | 326 | 598 | 582
Interest expense |  |  |  |  |  |  |  |  |  | (200) | (305) | (567) | (577)
Other (expenses) income, net |  |  |  |  |  |  |  |  |  | 12 | 8 | 22 | 6
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | 61 | 29 | 53 | 11
(Loss) income before income tax expense |  |  |  |  |  |  |  |  |  | 19 | 382 | 394 | 282
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 19 | 29 | 51 | 47
Total assets | 16,113 |  | 16,001 |  |  |  | 15,072 |  |  | 15,072 | 16,113 | 16,001 | 17,217
Total Operating Segments | Servicing |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | 217 | 740 | 408 | 766
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 19 | 0 | 124 | 0
Total revenues |  |  |  |  |  |  |  |  |  | 236 | 740 | 532 | 766
Total expenses |  |  |  |  |  |  |  |  |  | 303 | 474 | 690 | 691
Other income (expenses), net: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 222 | 288 | 500 | 527
Interest expense |  |  |  |  |  |  |  |  |  | (173) | (268) | (469) | (523)
Other (expenses) income, net |  |  |  |  |  |  |  |  |  | 6 | (1) | 4 | (3)
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | 55 | 19 | 35 | 1
(Loss) income before income tax expense |  |  |  |  |  |  |  |  |  | (12) | 285 | (123) | 76
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 9 | 15 | 19 | 23
Total assets | 14,578 |  | 11,044 |  |  |  | 13,485 |  |  | 13,485 | 14,578 | 11,044 | 15,006
Total Operating Segments | Originations |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | 24 | 36 | 80 | 63
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 157 | 270 | 963 | 528
Total revenues |  |  |  |  |  |  |  |  |  | 181 | 306 | 1,043 | 591
Total expenses |  |  |  |  |  |  |  |  |  | 155 | 245 | 568 | 439
Other income (expenses), net: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 27 | 38 | 98 | 55
Interest expense |  |  |  |  |  |  |  |  |  | (26) | (37) | (98) | (54)
Other (expenses) income, net |  |  |  |  |  |  |  |  |  | 5 | 0 | 4 | 0
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | 6 | 1 | 4 | 1
(Loss) income before income tax expense |  |  |  |  |  |  |  |  |  | 32 | 62 | 479 | 153
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 5 | 7 | 18 | 10
Total assets | 4,701 |  | 9,257 |  |  |  | 4,866 |  |  | 4,866 | 4,701 | 9,257 | 4,935
Total Operating Segments | Xome |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | 177 | 149 | 422 | 291
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  | 177 | 149 | 422 | 291
Total expenses |  |  |  |  |  |  |  |  |  | 178 | 123 | 398 | 247
Other income (expenses), net: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | (1) | 0 | 0 | 0
Other (expenses) income, net |  |  |  |  |  |  |  |  |  | 1 | 9 | 14 | 9
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | 0 | 9 | 14 | 9
(Loss) income before income tax expense |  |  |  |  |  |  |  |  |  | (1) | 35 | 38 | 53
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 5 | 7 | 14 | 14
Total assets | 425 |  | 526 |  |  |  | 493 |  |  | 493 | 425 | 526 | 393
Corporate/ Other |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | 0 | 1 | 2 | 2
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 0 | 0 | 11 | 0
Total revenues |  |  |  |  |  |  |  |  |  | 0 | 1 | 13 | 2
Total expenses |  |  |  |  |  |  |  |  |  | 71 | 103 | 198 | 98
Other income (expenses), net: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 7 | 7 | 7 | 15
Interest expense |  |  |  |  |  |  |  |  |  | (93) | (83) | (212) | (154)
Other (expenses) income, net |  |  |  |  |  |  |  |  |  | 1 | (2) | (7) | (3)
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | (85) | (78) | (212) | (142)
(Loss) income before income tax expense |  |  |  |  |  |  |  |  |  | (156) | (180) | (397) | (238)
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 20 | 4 | 40 | 12
Total assets | $ 913 |  | $ 2,304 |  |  |  | $ 1,901 |  |  | $ 1,901 | $ 913 | $ 2,304 | $ 819

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