Mortgage Servicing Rights and Related Liabilities - Servicing Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Transfers and Servicing [Abstract]
Contractually specified servicing fees(1)	$ 610	$ 547	$ 1,231	$ 1,061
Other service-related income(1)	19	16	54	38
Incentive and modification income(1)	22	16	47	34
Servicing late fees(1)	38	31	76	61
MSR MTM	(64)	(155)	210	(344)
(Gain) loss on MSR hedging activities	(29)	(103)	180	(225)
Loss (gain) on MSR and excess yield sales	3	23	(12)	11
Reclassifications to reserve provision(2)	(10)	(6)	(16)	(12)
Excess spread / MSR financing MTM	3	0	8	(6)
Total mark-to-market adjustments - Servicing	(31)	(69)	50	(112)
MSR amortization	287	226	518	405
Excess spread accretion	(9)	(9)	(17)	(18)
Total amortization, net of accretion	278	217	501	387
Originations service related fees(3)	30	19	56	35
Corporate/Xome service related fees	16	20	33	42
Other(4)	16	16	34	33
Total revenues - service related, net	472	485	912	963
Cash Flows Between Transferor and Transferee, Servicing Fees	$ 208	$ 189	$ 411	$ 374