Mortgage Servicing Rights and Related Liabilities - Servicing Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Transfers and Servicing [Abstract]
Contractually specified servicing fees(1)	$ 556	$ 440	$ 1,617	$ 1,231
Other service-related income(1)	18	25	56	58
Incentive and modification income(1)	16	18	50	32
Servicing late fees(1)	33	24	94	68
MSR MTM	388	(270)	44	(304)
(Gain) loss on MSR hedging activities	289	(192)	64	(244)
Gain on MSR and excess yield sales	(1)	(3)	10	29
Reclassifications to reserve provision(2)	(5)	(8)	(17)	(26)
Excess spread / MSR financing MTM	(20)	(4)	(26)	2
Total mark-to-market adjustments - Servicing	125	(63)	13	(65)
MSR amortization	245	171	650	444
Excess spread accretion	(10)	(11)	(28)	(32)
Total amortization, net of accretion	235	160	622	412
Originations service related fees(3)	24	18	59	45
Corporate/Xome service related fees	18	22	60	62
Other(4)	17	18	50	54
Total revenues - Service related, net	288	432	1,251	1,095
Cash Flows Between Transferor and Transferee, Servicing Fees	$ 189	$ 175	$ 563	$ 528