Mortgage Servicing Rights and Related Liabilities - Servicing Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Transfers and Servicing [Abstract]
Contractually specified servicing fees(1)	$ 621	$ 514
Other service-related income(1)	35	22
Incentive and modification income(1)	25	18
Servicing late fees(1)	38	30
MSR MTM	274	(189)
(Gain) loss on MSR hedging activities	209	(122)
Loss on MSR and excess yield sales	(15)	(12)
Reclassifications to reserve provision(2)	(6)	(6)
Excess spread / MSR financing MTM	5	(6)
Total mark-to-market adjustments - Servicing	81	(43)
MSR amortization	231	179
Excess spread accretion	(8)	(9)
Total amortization, net of accretion	223	170
Originations service related fees(3)	26	16
Corporate/Xome service related fees	17	22
Other(4)	18	17
Total revenues - Service related, net	440	478
Cash Flows Between Transferor and Transferee, Servicing Fees	$ 203	$ 185