Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]
Excess spread financing - fair value	$ 406		$ 406		$ 437
Excess Spread Financing UPB, Fair Value Disclosure	70,488		70,488		$ 74,219
Sale of Excess Yield, UPB	27,841	$ 41,958
Sale of Excess Yield, Total Proceeds	226	294
Gain on Sale of Excess Yield	27	33
Forward MSRs Sold
Servicing Assets at Fair Value [Line Items]
Unpaid principal balance sold			3,305	$ 1,605
Forward MSRs Sold, Subservicing Retained
Servicing Assets at Fair Value [Line Items]
UPB	$ 3,029	$ 590	$ 3,029	$ 590