Mortgage Servicing Rights and Related Liabilities - Revenues for Services Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Transfers and Servicing [Abstract]
Contractually specified servicing fees(1)	$ 2,222,000,000	$ 1,700,000,000	$ 1,458,000,000
Other service-related income(1)	77,000,000	72,000,000	105,000,000
Incentive and modification income(1)	69,000,000	43,000,000	29,000,000
Servicing late fees(1)	128,000,000	89,000,000	76,000,000
MSR MTM	650,000,000	121,000,000	1,328,000,000
Loss on MSR hedging activities	517,000,000	68,000,000	332,000,000
(Loss) gain on MSR and excess yield sales	(9,000,000)	23,000,000	(3,000,000)
Reclassifications to reserve provision(2)	25,000,000	33,000,000	30,000,000
Excess spread / MSR financing MTM	(18,000,000)	(18,000,000)	(142,000,000)
Total mark-to-market adjustments - Servicing	81,000,000	25,000,000	821,000,000
MSR amortization	(923,000,000)	(604,000,000)	(779,000,000)
Excess spread accretion	(37,000,000)	(41,000,000)	(86,000,000)
Total amortization, net of accretion	(886,000,000)	(563,000,000)	(693,000,000)
Originations service related fees(3)	86,000,000	61,000,000	98,000,000
Corporate/Xome service related fees	77,000,000	84,000,000	76,000,000
Other(4)	(66,000,000)	(71,000,000)	(105,000,000)
Total revenues - Service Related, net	1,788,000,000	1,440,000,000	1,865,000,000
Cash Flows Between Transferor and Transferee, Servicing Fees	$ 759,000,000	$ 708,000,000	$ 661,000,000