Mortgage Servicing Rights and Related Liabilities - Servicing Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Transfers and Servicing [Abstract]
Contractually specified servicing fees(1)	$ 384,000,000	$ 327,000,000
Other service-related income(1)	14,000,000	33,000,000
Incentive and modification income(1)	6,000,000	9,000,000
Servicing late fees(1)	21,000,000	19,000,000
Mark-to-market adjustments - Servicing(2)(3)	(61,000,000)	553,000,000
Amortization, net of accretion(4)	(115,000,000)	(202,000,000)
Originations service fees(5)	11,000,000	42,000,000
Corporate/Xome related service fees	19,000,000	12,000,000
Other(6)	(18,000,000)	(38,000,000)
Total revenues - Service Related, net	261,000,000	755,000,000
Cash Flows Between Transferor and Transferee, Servicing Fees	177,000,000	146,000,000
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans	9,000,000	6,000,000
(Gain) loss on MSR hedging activities	59,000,000	(140,000,000)
Servicing fee income accretion expense	$ 10,000,000	$ 33,000,000