Business Segment Reporting - Financial Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) segment	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	4
Revenues:
Service related, net	$ 84
Net gain on mortgage loans held for sale	166
Total revenues	250
Total Expenses	443
Other income (expenses)
Interest income	134
Interest expense	(189)
Other	15
Total other income (expenses), net	(40)
(Loss) income before income tax expense (benefit)	(233)
Depreciation and amortization for property and equipment and intangible assets	21
Total assets	17,646		$ 16,973
Predecessor
Revenues:
Service related, net		$ 464
Net gain on mortgage loans held for sale		124
Total revenues		588
Total Expenses		364
Other income (expenses)
Interest income		145
Interest expense		(171)
Other		8
Total other income (expenses), net		(18)
(Loss) income before income tax expense (benefit)		206
Depreciation and amortization for property and equipment and intangible assets		15
Total assets		17,864
Operating Segments
Revenues:
Service related, net	84
Net gain on mortgage loans held for sale	166
Total revenues	250
Total Expenses	398
Other income (expenses)
Interest income	132
Interest expense	(132)
Other	15
Total other income (expenses), net	15
(Loss) income before income tax expense (benefit)	(133)
Depreciation and amortization for property and equipment and intangible assets	11
Total assets	14,909
Operating Segments | Predecessor
Revenues:
Service related, net		464
Net gain on mortgage loans held for sale		124
Total revenues		588
Total Expenses		343
Other income (expenses)
Interest income		141
Interest expense		(133)
Other		8
Total other income (expenses), net		16
(Loss) income before income tax expense (benefit)		261
Depreciation and amortization for property and equipment and intangible assets		13
Total assets		17,045
Operating Segments | Servicing Segment
Revenues:
Service related, net	8
Net gain on mortgage loans held for sale	0
Total revenues	8
Total Expenses	195
Other income (expenses)
Interest income	115
Interest expense	(114)
Other	0
Total other income (expenses), net	1
(Loss) income before income tax expense (benefit)	(186)
Depreciation and amortization for property and equipment and intangible assets	4
Total assets	13,642
Operating Segments | Servicing Segment | Predecessor
Revenues:
Service related, net		395
Net gain on mortgage loans held for sale		0
Total revenues		395
Total Expenses		182
Other income (expenses)
Interest income		126
Interest expense		(118)
Other		(1)
Total other income (expenses), net		7
(Loss) income before income tax expense (benefit)		220
Depreciation and amortization for property and equipment and intangible assets		7
Total assets		15,224
Operating Segments | Originations Segment
Revenues:
Service related, net	15
Net gain on mortgage loans held for sale	131
Total revenues	146
Total Expenses	104
Other income (expenses)
Interest income	17
Interest expense	(18)
Other	4
Total other income (expenses), net	3
(Loss) income before income tax expense (benefit)	45
Depreciation and amortization for property and equipment and intangible assets	3
Total assets	4,865
Operating Segments | Originations Segment | Predecessor
Revenues:
Service related, net		15
Net gain on mortgage loans held for sale		113
Total revenues		128
Total Expenses		109
Other income (expenses)
Interest income		15
Interest expense		(15)
Other		0
Total other income (expenses), net		0
(Loss) income before income tax expense (benefit)		19
Depreciation and amortization for property and equipment and intangible assets		3
Total assets		4,710
Operating Segments | Xome
Revenues:
Service related, net	96
Net gain on mortgage loans held for sale	0
Total revenues	96
Total Expenses	99
Other income (expenses)
Interest income	0
Interest expense	0
Other	11
Total other income (expenses), net	11
(Loss) income before income tax expense (benefit)	8
Depreciation and amortization for property and equipment and intangible assets	4
Total assets	502
Operating Segments | Xome | Predecessor
Revenues:
Service related, net		65
Net gain on mortgage loans held for sale		0
Total revenues		65
Total Expenses		52
Other income (expenses)
Interest income		0
Interest expense		0
Other		9
Total other income (expenses), net		9
(Loss) income before income tax expense (benefit)		22
Depreciation and amortization for property and equipment and intangible assets		3
Total assets		413
Eliminations
Revenues:
Service related, net	(35)
Net gain on mortgage loans held for sale	35
Total revenues	0
Total Expenses	0
Other income (expenses)
Interest income	0
Interest expense	0
Other	0
Total other income (expenses), net	0
(Loss) income before income tax expense (benefit)	0
Depreciation and amortization for property and equipment and intangible assets	0
Total assets	(4,100)
Eliminations | Predecessor
Revenues:
Service related, net		(11)
Net gain on mortgage loans held for sale		11
Total revenues		0
Total Expenses		0
Other income (expenses)
Interest income		0
Interest expense		0
Other		0
Total other income (expenses), net		0
(Loss) income before income tax expense (benefit)		0
Depreciation and amortization for property and equipment and intangible assets		0
Total assets		(3,302)
Corporate and Other
Revenues:
Service related, net	0
Net gain on mortgage loans held for sale	0
Total revenues	0
Total Expenses	45
Other income (expenses)
Interest income	2
Interest expense	(57)
Other	0
Total other income (expenses), net	(55)
(Loss) income before income tax expense (benefit)	(100)
Depreciation and amortization for property and equipment and intangible assets	10
Total assets	$ 2,737
Corporate and Other | Predecessor
Revenues:
Service related, net		0
Net gain on mortgage loans held for sale		0
Total revenues		0
Total Expenses		21
Other income (expenses)
Interest income		4
Interest expense		(38)
Other		0
Total other income (expenses), net		(34)
(Loss) income before income tax expense (benefit)		(55)
Depreciation and amortization for property and equipment and intangible assets		2
Total assets		$ 819