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Debt Instruments - Finance Receivables Facility (Details) - USD ($)	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023	May 31, 2023	Mar. 31, 2022	Dec. 31, 2021	Apr. 30, 2021	Feb. 29, 2020
Line of Credit Facility [Line Items]
Short-term revolving facilities	$ 72,000,000	$ 67,000,000
Restricted cash	73,000,000	44,000,000	$ 65,000,000
Revolving Credit Facility \| SPVANA I Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity (up to)				$ 500,000,000
Revolving Credit Facility \| SPVANA II Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity (up to)							$ 600,000,000		$ 500,000,000
Revolving Credit Facility \| SPVANA III Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity (up to)							$ 600,000,000	$ 500,000,000
Revolving Credit Facility \| SPVANA V Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity (up to)						$ 500,000,000
Revolving Credit Facility \| SPVANA VI Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity (up to)					$ 500,000,000
Revolving Credit Facility \| All SPVANA Credit Facilities
Line of Credit Facility [Line Items]
Short-term revolving facilities	0	0
Line of credit facility, remaining borrowing capacity	$ 2,700,000,000	$ 2,700,000,000
Interest rate	5.52%	7.39%
Revolving Credit Facility \| Finance receivable facilities
Line of Credit Facility [Line Items]
Restricted cash	$ 18,000,000	$ 2,000,000