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Fair Value of Financial Instruments - Schedule of Fair Value Assets Measured on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Beneficial interests in securitizations $ 486 $ 464
Purchase price adjustment receivables   2
Root Warrants    
Assets:    
Root Warrants 123 120
Money market funds    
Assets:    
Money market funds 1,145 1,154
Level 1    
Assets:    
Beneficial interests in securitizations 0 0
Purchase price adjustment receivables   0
Level 1 | Root Warrants    
Assets:    
Root Warrants 0 0
Level 1 | Money market funds    
Assets:    
Money market funds 1,145 1,154
Level 2    
Assets:    
Beneficial interests in securitizations 0 0
Purchase price adjustment receivables   0
Level 2 | Root Warrants    
Assets:    
Root Warrants 0 0
Level 2 | Money market funds    
Assets:    
Money market funds 0 0
Level 3    
Assets:    
Beneficial interests in securitizations 486 464
Purchase price adjustment receivables   2
Level 3 | Root Warrants    
Assets:    
Root Warrants 123 120
Level 3 | Money market funds    
Assets:    
Money market funds $ 0 $ 0