Mortgage Servicing Rights and Related Liabilities - Servicing Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Transfers and Servicing [Abstract]
Contractually specified servicing fees(1)	$ 407,000,000	$ 378,000,000	$ 791,000,000	$ 705,000,000
Other service-related income(1)	19,000,000	39,000,000	33,000,000	72,000,000
Incentive and modification income(1)	8,000,000	9,000,000	14,000,000	18,000,000
Servicing late fees(1)	23,000,000	19,000,000	44,000,000	38,000,000
MSR MTM	(139,000,000)	(326,000,000)	(34,000,000)	(1,124,000,000)
Loss on MSR hedging activities	(111,000,000)	(89,000,000)	(52,000,000)	(229,000,000)
Gain on MSR sales	32,000,000	1,000,000	32,000,000	1,000,000
Reclassifications(2)	(9,000,000)	(6,000,000)	(18,000,000)	(12,000,000)
Excess spread /MSR financing MTM	12,000,000	(32,000,000)	6,000,000	(131,000,000)
Total mark-to-market adjustments - Servicing	(63,000,000)	(200,000,000)	(2,000,000)	(753,000,000)
MSR amortization	148,000,000	226,000,000	273,000,000	461,000,000
Excess spread accretion	(11,000,000)	(27,000,000)	(21,000,000)	(60,000,000)
Total amortization, net of accretion	137,000,000	199,000,000	252,000,000	401,000,000
Originations service fees(3)	16,000,000	24,000,000	27,000,000	66,000,000
Corporate/Xome related service fees	21,000,000	22,000,000	40,000,000	34,000,000
Other(4)	18,000,000	32,000,000	36,000,000	70,000,000
Total revenues - Service Related, net	402,000,000	460,000,000	663,000,000	1,215,000,000
Cash Flows Between Transferor and Transferee, Servicing Fees	$ 176,000,000	$ 170,000,000	$ 353,000,000	$ 316,000,000