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Fair Value of Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024
Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	$ 33,000,000	$ 97,000,000
Residential Consumer Loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	2,000,000,000.00	4,870,000,000
Total Residential Investor Loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	449,000,000	1,230,000,000
HEIs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisitions	500,000	1,000,000
MSRs and Other Asset Class
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Acquisitions	$ 0	$ 200,000

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