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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, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Jul. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  | $ 259 | $ 159 |  |  |  |  |  |  | $ 418 |  |  |  |
Net gain on mortgage loans held for sale |  | 83 | 93 |  |  |  |  |  |  | 176 |  |  |  |
Total revenues |  | 342 | 252 |  |  |  |  |  |  | 594 |  |  |  |
Total expenses |  | 275 | 432 |  |  |  |  |  |  | 707 |  |  |  |
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 256 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (293) |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  | 13 |  |  |  |
Total other income (expenses), net |  | (26) | 2 |  |  |  |  |  |  | (24) |  |  |  |
(Loss) income before income tax (benefit) expense |  | $ 41 | (178) |  |  |  |  |  |  | (137) |  |  |  |
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 39 |  |  |  |
Total assets |  |  | 16,973 |  |  |  |  |  |  | 16,973 |  | $ 16,973 |  |
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | (19) |  |  |  |
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 19 |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Total assets |  |  | (3,772) |  |  |  |  |  |  | (3,772) |  | (3,772) |  |
Total Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | 418 |  |  |  |
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 176 |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 594 |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 636 |  |  |  |
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 249 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (200) |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  | 12 |  |  |  |
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | 61 |  |  |  |
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  | 19 |  |  |  |
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 19 |  |  |  |
Total assets |  |  | 15,072 |  |  |  |  |  |  | 15,072 |  | 15,072 |  |
Total Operating Segments | Servicing |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | 236 |  |  |  |
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 236 |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 303 |  |  |  |
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 222 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (173) |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  | 6 |  |  |  |
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | 55 |  |  |  |
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  | (12) |  |  |  |
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 9 |  |  |  |
Total assets |  |  | 13,485 |  |  |  |  |  |  | 13,485 |  | 13,485 |  |
Total Operating Segments | Originations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | 24 |  |  |  |
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 157 |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 181 |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 155 |  |  |  |
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 27 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (26) |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | 6 |  |  |  |
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  | 32 |  |  |  |
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Total assets |  |  | 4,866 |  |  |  |  |  |  | 4,866 |  | 4,866 |  |
Total Operating Segments | Xome |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | 177 |  |  |  |
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 177 |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 178 |  |  |  |
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (1) |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  | (1) |  |  |  |
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Total assets |  |  | 493 |  |  |  |  |  |  | 493 |  | 493 |  |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 71 |  |  |  |
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 7 |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | (93) |  |  |  |
Other income (expense) |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Total other income (expenses), net |  |  |  |  |  |  |  |  |  | (85) |  |  |  |
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  | (156) |  |  |  |
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Total assets |  |  | $ 1,901 |  |  |  |  |  |  | $ 1,901 |  | $ 1,901 |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net | $ 120 |  |  | $ 317 | $ 464 | $ 295 | $ 252 | $ 213 | $ 283 |  | $ 901 |  | $ 1,043 | $ 1,122
Net gain on mortgage loans held for sale | 44 |  |  | 127 | 124 | 142 | 154 | 167 | 144 |  | 295 |  | 607 | 793
Total revenues | 164 |  |  | 444 | 588 | 437 | 406 | 380 | 427 |  | 1,196 |  | 1,650 | 1,915
Total expenses | 242 |  |  | 339 | 364 | 366 | 368 | 369 | 372 |  | 945 |  | 1,475 | 1,644
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 333 |  | 597 | 425
Interest expense |  |  |  |  |  |  |  |  |  |  | (388) |  | (731) | (665)
Other income (expense) |  |  |  |  |  |  |  |  |  |  | 6 |  | 3 | (2)
Total other income (expenses), net | (5) |  |  | (26) | (18) | (13) | (26) | (40) | (52) |  | (49) |  | (131) | (242)
(Loss) income before income tax (benefit) expense | (83) |  |  | $ 79 | $ 206 | 58 | $ 12 | $ (29) | $ 3 |  | 202 |  | 44 | 29
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  |  | 33 |  | 59 | 63
Total assets | 17,026 |  |  |  |  | 18,036 |  |  |  |  | 17,026 |  | 18,036 | 19,593
Predecessor | Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  |  | (25) |  | (79) | (118)
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  |  | 25 |  | 79 | 118
Total revenues |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Total expenses |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Other income (expense) |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Total other income (expenses), net |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Total assets | (3,591) |  |  |  |  | (3,117) |  |  |  |  | (3,591) |  | (3,117) | (2,448)
Predecessor | Total Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  |  | 900 |  | 1,041 | 1,121
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  |  | 295 |  | 607 | 793
Total revenues |  |  |  |  |  |  |  |  |  |  | 1,195 |  | 1,648 | 1,914
Total expenses |  |  |  |  |  |  |  |  |  |  | 842 |  | 1,377 | 1,515
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 326 |  | 582 | 410
Interest expense |  |  |  |  |  |  |  |  |  |  | (305) |  | (577) | (500)
Other income (expense) |  |  |  |  |  |  |  |  |  |  | 8 |  | 6 | (1)
Total other income (expenses), net |  |  |  |  |  |  |  |  |  |  | 29 |  | 11 | (91)
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | 382 |  | 282 | 308
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  |  | 29 |  | 47 | 55
Total assets | 16,113 |  |  |  |  | 17,217 |  |  |  |  | 16,113 |  | 17,217 | 18,653
Predecessor | Total Operating Segments | Servicing |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  |  | 740 |  | 766 | 753
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  | 740 |  | 766 | 753
Total expenses |  |  |  |  |  |  |  |  |  |  | 474 |  | 691 | 634
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 288 |  | 527 | 347
Interest expense |  |  |  |  |  |  |  |  |  |  | (268) |  | (523) | (442)
Other income (expense) |  |  |  |  |  |  |  |  |  |  | (1) |  | (3) | 0
Total other income (expenses), net |  |  |  |  |  |  |  |  |  |  | 19 |  | 1 | (95)
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | 285 |  | 76 | 24
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  |  | 15 |  | 23 | 23
Total assets | 14,578 |  |  |  |  | 15,006 |  |  |  |  | 14,578 |  | 15,006 | 16,189
Predecessor | Total Operating Segments | Originations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  |  | 36 |  | 63 | 63
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  |  | 270 |  | 528 | 675
Total revenues |  |  |  |  |  |  |  |  |  |  | 306 |  | 591 | 738
Total expenses |  |  |  |  |  |  |  |  |  |  | 245 |  | 439 | 527
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 38 |  | 55 | 63
Interest expense |  |  |  |  |  |  |  |  |  |  | (37) |  | (54) | (58)
Other income (expense) |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | (1)
Total other income (expenses), net |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 | 4
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | 62 |  | 153 | 215
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  |  | 7 |  | 10 | 11
Total assets | 4,701 |  |  |  |  | 4,935 |  |  |  |  | 4,701 |  | 4,935 | 4,563
Predecessor | Total Operating Segments | Xome |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  |  | 149 |  | 291 | 423
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  | 149 |  | 291 | 423
Total expenses |  |  |  |  |  |  |  |  |  |  | 123 |  | 247 | 354
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Other income (expense) |  |  |  |  |  |  |  |  |  |  | 9 |  | 9 | 0
Total other income (expenses), net |  |  |  |  |  |  |  |  |  |  | 9 |  | 9 | 0
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | 35 |  | 53 | 69
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  |  | 7 |  | 14 | 21
Total assets | 425 |  |  |  |  | 393 |  |  |  |  | 425 |  | 393 | 349
Predecessor | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service related, net |  |  |  |  |  |  |  |  |  |  | 1 |  | 2 | 1
Net gain on mortgage loans held for sale |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  | 1 |  | 2 | 1
Total expenses |  |  |  |  |  |  |  |  |  |  | 103 |  | 98 | 129
Other income (expenses): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  | 7 |  | 15 | 15
Interest expense |  |  |  |  |  |  |  |  |  |  | (83) |  | (154) | (165)
Other income (expense) |  |  |  |  |  |  |  |  |  |  | (2) |  | (3) | (1)
Total other income (expenses), net |  |  |  |  |  |  |  |  |  |  | (78) |  | (142) | (151)
(Loss) income before income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | (180) |  | (238) | (279)
Depreciation and amortization for property and equipment and intangible assets |  |  |  |  |  |  |  |  |  |  | 4 |  | 12 | 8
Total assets | $ 913 |  |  |  |  | $ 819 |  |  |  |  | $ 913 |  | $ 819 | $ 940

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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