Mortgage Servicing Rights and Related Liabilities - Revenues for Services Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Transfers and Servicing [Abstract]
Contractually specified servicing fees(1)	$ 1,458	$ 1,122	$ 1,141
Other service-related income - Servicing(1)	105	72	68
Incentive and modification income(1)	29	51	39
Servicing late fees(1)	76	71	83
Mark-to-market adjustments - Servicing(2)(3)	821	421	(609)
Amortization, net of accretion(4)	(693)	(753)	(510)
Originations service fees(5)	98	176	105
Corporate/Xome related service fees	76	186	433
Other(6)	(105)	(279)	(371)
Total Revenues - Service Related, net	1,865	1,067	379
Cash Flows Between Transferor and Transferee, Servicing Fees	661	495	374
Losses for inactive and liquidated loans that are no longer part of the MSR portfolio	30	35	28
Loss (gain) on MSR hedging activities	332	86	(41)
Accretion expense	$ 86	$ 255	$ 338