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Debt Instruments - Finance Receivables Facility (Details) - USD ($)
Sep. 30, 2025
Aug. 31, 2025
Dec. 31, 2024
Sep. 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 $ 73,000,000   $ 67,000,000              
Restricted cash 79,000,000   44,000,000 $ 61,000,000            
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 IV 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)   $ 600,000,000       $ 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) 600,000,000                  
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 $ 3,500,000,000   $ 2,700,000,000              
Interest rate 5.96%   7.39%              
Revolving Credit Facility | Finance receivable facilities                    
Line of Credit Facility [Line Items]                    
Restricted cash $ 3,000,000   $ 2,000,000