Business Segment Reporting - Financial Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenues:
Service related, net	$ (53)	$ 84
Net gain on mortgage loans held for sale	331	166
Total revenues	278	250
Total Expenses	444	443
Other income (expenses)
Interest income	118	134
Interest expense	(192)	(189)
Other	1	15
Total other income (expenses), net	(73)	(40)
Loss before income tax benefit	(239)	(233)
Depreciation and amortization for property and equipment and intangible assets	19	21
Total assets	17,613	17,646	$ 18,305
Operating Segments
Revenues:
Service related, net	(55)	84
Net gain on mortgage loans held for sale	331	166
Total revenues	276	250
Total Expenses	410	398
Other income (expenses)
Interest income	117	132
Interest expense	(140)	(132)
Other	1	15
Total other income (expenses), net	(22)	15
Loss before income tax benefit	(156)	(133)
Depreciation and amortization for property and equipment and intangible assets	9	11
Total assets	14,320	14,909
Operating Segments | Servicing Segment
Revenues:
Service related, net	(180)	(27)
Net gain on mortgage loans held for sale	34	35
Total revenues	(146)	8
Total Expenses	149	195
Other income (expenses)
Interest income	83	115
Interest expense	(113)	(114)
Other	0	0
Total other income (expenses), net	(30)	1
Loss before income tax benefit	(325)	(186)
Depreciation and amortization for property and equipment and intangible assets	3	4
Total assets	10,142	13,642
Operating Segments | Originations Segment
Revenues:
Service related, net	20	15
Net gain on mortgage loans held for sale	297	131
Total revenues	317	146
Total Expenses	166	104
Other income (expenses)
Interest income	34	17
Interest expense	(27)	(18)
Other	0	4
Total other income (expenses), net	7	3
Loss before income tax benefit	158	45
Depreciation and amortization for property and equipment and intangible assets	3	3
Total assets	9,608	4,865
Operating Segments | Xome Segment
Revenues:
Service related, net	106	96
Net gain on mortgage loans held for sale	0	0
Total revenues	106	96
Total Expenses	96	99
Other income (expenses)
Interest income	0	0
Interest expense	0	0
Other	1	11
Total other income (expenses), net	1	11
Loss before income tax benefit	11	8
Depreciation and amortization for property and equipment and intangible assets	3	4
Total assets	534	502
Eliminations/Reclassification
Revenues:
Service related, net	(1)	0
Net gain on mortgage loans held for sale	0	0
Total revenues	(1)	0
Total Expenses	(1)	0
Other income (expenses)
Interest income	0	0
Interest expense	0	0
Other	0	0
Total other income (expenses), net	0	0
Loss before income tax benefit	0	0
Depreciation and amortization for property and equipment and intangible assets	0	0
Total assets	(5,964)	(4,100)
Corporate/Other
Revenues:
Service related, net	2	0
Net gain on mortgage loans held for sale	0	0
Total revenues	2	0
Total Expenses	34	45
Other income (expenses)
Interest income	1	2
Interest expense	(52)	(57)
Other	0	0
Total other income (expenses), net	(51)	(55)
Loss before income tax benefit	(83)	(100)
Depreciation and amortization for property and equipment and intangible assets	10	10
Total assets	$ 3,293	$ 2,737