Mortgage Servicing Rights and Related Liabilities - Revenues for Services Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Transfers and Servicing [Abstract]
Contractually specified servicing fees(1)	$ 1,700,000,000	$ 1,458,000,000	$ 1,122,000,000
Other service-related income(1)	72,000,000	105,000,000	72,000,000
Incentive and modification income(1)	43,000,000	29,000,000	51,000,000
Servicing late fees(1)	89,000,000	76,000,000	71,000,000
MSR MTM	121,000,000	1,328,000,000	502,000,000
Loss on MSR hedging activities	68,000,000	332,000,000	86,000,000
Gain (loss) on MSR sales	23,000,000	(3,000,000)	7,000,000
Reclassifications(2)	33,000,000	30,000,000	35,000,000
Excess spread / MSR financing MTM	(18,000,000)	(142,000,000)	33,000,000
Total mark-to-market adjustments - Servicing	25,000,000	821,000,000	421,000,000
MSR amortization	(604,000,000)	(779,000,000)	(1,008,000,000)
Excess spread accretion	(41,000,000)	(86,000,000)	(255,000,000)
Total amortization, net of accretion	(563,000,000)	(693,000,000)	(753,000,000)
Originations service fees(3)	61,000,000	98,000,000	176,000,000
Corporate/Xome related service fees	84,000,000	76,000,000	186,000,000
Other(4)	(71,000,000)	(105,000,000)	(279,000,000)
Service related, net	1,440,000,000	1,865,000,000	1,067,000,000
Cash Flows Between Transferor and Transferee, Servicing Fees	$ 708,000,000	$ 661,000,000	$ 495,000,000