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