Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]
Sale of Excess Yield, Principal Outstanding	$ 41,958
Sale of Excess Yield, Total Proceeds	294
Gain on Sale of Excess Yield	33
Excess Spread Financing UPB, Fair Value Disclosure	74,219	$ 83,706
Forward MSRs Sold
Servicing Assets at Fair Value [Line Items]
Unpaid principal balance sold	25,239	20,902
Forward MSRs Sold, Subservicing Retained
Servicing Assets at Fair Value [Line Items]
Principal amount outstanding on mortgage servicing rights	$ 23,218	$ 19,817