Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses
Percent of Loans Held for Investment	100.00%	100.00%	100.00%	100.00%
Impairment expense	$ 31	$ 46
Warrants exercise price (in usd per share)	$ 7.50	$ 7.50	$ 7.50
Warrant outstanding (in shares)			105
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Premises
Financing Receivable, Allowance for Credit Losses
Estimated useful lives	20 years	20 years	20 years
Furniture, fixtures and equipment, and building improvements
Financing Receivable, Allowance for Credit Losses
Estimated useful lives	13 years 6 months	13 years 6 months	13 years 6 months
Furniture, fixtures and equipment, and building improvements | Minimum
Financing Receivable, Allowance for Credit Losses
Estimated useful lives	3 years	3 years	3 years
Furniture, fixtures and equipment, and building improvements | Maximum
Financing Receivable, Allowance for Credit Losses
Estimated useful lives	10 years	10 years	10 years