Goodwill and Intangible Assets - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of goodwill	$ 0	$ 0
Goodwill	120,000,000	120,000,000
Goodwill [Line Items]
Amortization expense	12,000,000	31,000,000
Impairment of technology and intangible assets	0
Goodwill	120,000,000	120,000,000
Corporate/ Other
Goodwill [Line Items]
Impairment of technology and intangible assets		10,000,000
Servicing
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	80,000,000	80,000,000
Goodwill [Line Items]
Goodwill	80,000,000	80,000,000
Originations
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	28,000,000	28,000,000
Goodwill [Line Items]
Goodwill	28,000,000	$ 28,000,000
Xome Segment [Member]
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	12,000,000
Goodwill [Line Items]
Goodwill	$ 12,000,000