Segment Information - Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenues:
Service related, net	$ (8)	$ 0	$ 572	$ (67)
Net gain on mortgage loans held for sale	582	618	1,261	949
Total revenues	574	618	1,833	882
Total expenses	425	398	879	822
Other income (expenses)
Interest income	51	22	97	97
Interest expense	(119)	(127)	(245)	(266)
Other income (expense), net	486	0	486	1
Total other income (expenses), net	418	(105)	338	(168)
Income (loss) from continuing operations before income tax expense (benefit)	567	115	1,292	(108)
Depreciation and amortization for property and equipment and intangible assets from continuing operations	16	17	31	36
Total assets	23,308	17,300	23,308	17,300	$ 24,165
Total assets of discontinues operations	4,935		4,935		5,347
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Title Business
Other income (expenses)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	487
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Champion Mortgage [Member]
Other income (expenses)
Total assets of discontinues operations	4,935		4,935		$ 5,347
Operating Segments | Servicing
Revenues:
Service related, net	(92)	(126)	349	(320)
Net gain on mortgage loans held for sale	197	45	324	79
Total revenues	105	(81)	673	(241)
Total expenses	121	102	231	231
Other income (expenses)
Interest income	25	3	48	43
Interest expense	(65)	(67)	(136)	(127)
Other income (expense), net	0	0	0	0
Total other income (expenses), net	(40)	(64)	(88)	(84)
Income (loss) from continuing operations before income tax expense (benefit)	(56)	(247)	354	(556)
Depreciation and amortization for property and equipment and intangible assets from continuing operations	7	4	12	8
Total assets	15,973	10,736	15,973	10,736
Operating Segments | Originations
Revenues:
Service related, net	45	21	88	41
Net gain on mortgage loans held for sale	385	573	937	870
Total revenues	430	594	1,025	911
Total expenses	226	167	457	333
Other income (expenses)
Interest income	26	19	49	53
Interest expense	(23)	(13)	(48)	(40)
Other income (expense), net	0	0	0	0
Total other income (expenses), net	3	6	1	13
Income (loss) from continuing operations before income tax expense (benefit)	207	433	569	591
Depreciation and amortization for property and equipment and intangible assets from continuing operations	6	4	10	7
Total assets	4,582	3,592	4,582	3,592
Operating Segments | Xome
Revenues:
Service related, net	39	106	135	212
Net gain on mortgage loans held for sale	0	0	0	0
Total revenues	39	106	135	212
Total expenses	45	95	132	191
Other income (expenses)
Interest income	0	0	0	0
Interest expense	0	0	0	0
Other income (expense), net	486	1	486	2
Total other income (expenses), net	486	1	486	2
Income (loss) from continuing operations before income tax expense (benefit)	480	12	489	23
Depreciation and amortization for property and equipment and intangible assets from continuing operations	3	3	6	6
Total assets	573	135	573	135
Corporate/Other
Revenues:
Service related, net	0	(1)	0	0
Net gain on mortgage loans held for sale	0	0	0	0
Total revenues	0	(1)	0	0
Total expenses	33	34	59	67
Other income (expenses)
Interest income	0	0	0	1
Interest expense	(31)	(47)	(61)	(99)
Other income (expense), net	0	(1)	0	(1)
Total other income (expenses), net	(31)	(48)	(61)	(99)
Income (loss) from continuing operations before income tax expense (benefit)	(64)	(83)	(120)	(166)
Depreciation and amortization for property and equipment and intangible assets from continuing operations	0	6	3	15
Total assets	$ 2,180	$ 2,837	$ 2,180	$ 2,837