Business Segment Reporting - Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenues:
Service related, net	$ 12	$ 137	$ (41)	$ 221
Net gain on mortgage loans held for sale	618	262	949	428
Total revenues	630	399	908	649
Total expenses	419	492	863	935
Other income (expenses)
Interest income	76	162	194	296
Interest expense	(177)	(187)	(369)	(376)
Other income (expenses), net	0	1	1	16
Total other expenses, net	(101)	(24)	(174)	(64)
Income (loss) before income tax expense (benefit)	110	(117)	(129)	(350)
Depreciation and amortization for property and equipment and intangible assets	18	24	37	45
Total assets	17,300	18,405	17,300	18,405	$ 18,305
Operating Segments | Servicing
Revenues:
Service related, net	(114)	9	(294)	(18)
Net gain on mortgage loans held for sale	45	18	79	53
Total revenues	(69)	27	(215)	35
Total expenses	122	189	271	384
Other income (expenses)
Interest income	57	136	140	251
Interest expense	(117)	(109)	(230)	(223)
Other income (expenses), net	0	0	0	0
Total other expenses, net	(60)	27	(90)	28
Income (loss) before income tax expense (benefit)	(251)	(135)	(576)	(321)
Depreciation and amortization for property and equipment and intangible assets	5	4	8	8
Total assets	10,736	12,906	10,736	12,906
Operating Segments | Originations
Revenues:
Service related, net	21	20	41	35
Net gain on mortgage loans held for sale	573	244	870	375
Total revenues	594	264	911	410
Total expenses	167	145	333	249
Other income (expenses)
Interest income	19	23	53	40
Interest expense	(13)	(25)	(40)	(43)
Other income (expenses), net	0	1	0	5
Total other expenses, net	6	(1)	13	2
Income (loss) before income tax expense (benefit)	433	118	591	163
Depreciation and amortization for property and equipment and intangible assets	4	6	7	9
Total assets	3,592	3,462	3,592	3,462
Operating Segments | Xome
Revenues:
Service related, net	106	108	212	204
Net gain on mortgage loans held for sale	0	0	0	0
Total revenues	106	108	212	204
Total expenses	95	101	191	200
Other income (expenses)
Interest income	0	0	0	0
Interest expense	0	0	0	0
Other income (expenses), net	1	0	2	11
Total other expenses, net	1	0	2	11
Income (loss) before income tax expense (benefit)	12	7	23	15
Depreciation and amortization for property and equipment and intangible assets	3	3	6	7
Total assets	135	112	135	112
Corporate/Other
Revenues:
Service related, net	(1)	0	0	0
Net gain on mortgage loans held for sale	0	0	0	0
Total revenues	(1)	0	0	0
Total expenses	35	57	68	102
Other income (expenses)
Interest income	0	3	1	5
Interest expense	(47)	(53)	(99)	(110)
Other income (expenses), net	(1)	0	(1)	0
Total other expenses, net	(48)	(50)	(99)	(105)
Income (loss) before income tax expense (benefit)	(84)	(107)	(167)	(207)
Depreciation and amortization for property and equipment and intangible assets	6	11	16	21
Total assets	$ 2,837	$ 1,925	$ 2,837	$ 1,925