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Fair Value of Financial Instruments - Narrative (Details) shares in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2022 USD ($) | Sep. 01, 2025 tranche shares | Dec. 31, 2024 USD ($) | Oct. 31, 2021 USD ($) tranche
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Number of tranches expired | tranche |  |  |  |  |  | 3 |  |
Root Warrants |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Equity securities, not readily determinable fair value |  |  |  |  |  |  |  | $ 126,000,000
Number of tranches | tranche |  |  |  |  |  | 4 |  | 8
Root Warrants for 2.4 million shares |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Number of securities called by warrants (in shares) | shares |  |  |  |  |  | 2.4 |  |
Root Warrants for 3.2 million shares |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Number of securities called by warrants (in shares) | shares |  |  |  |  |  | 3.2 |  |
Root Warrants for 1.6 million shares |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Number of securities called by warrants (in shares) | shares |  |  |  |  |  | 1.6 |  |
Root Warrants for 1.4 million shares |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Number of securities called by warrants (in shares) | shares |  |  |  |  |  | 1.4 |  |
Root Warrants | Root Warrants |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Deferred revenue | $ 41,000,000 |  | $ 41,000,000 |  |  |  | $ 57,000,000 |
Deferred revenue recognized | $ 5,000,000 | $ 6,000,000 | $ 16,000,000 | $ 16,000,000 |  |  |  |
Measurement Input, Price Volatility | Root Warrants |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Warrants and rights outstanding, measurement input | 1 | 1 | 1 | 1 |  |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Purchase price adjustment receivable gain (loss) (less than) | $ 2,000,000 | $ (1,000,000) | $ 2,000,000 | $ 1,000,000 |  |  |  |
Level 3 | Root Warrants | Root Warrants |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Equity securities, fair value |  |  |  |  |  |  |  | $ 30,000,000
Asset issuances |  |  |  |  | $ 75,000,000 |  |  |
Total increase (decrease) in fair value | (120,000,000) | (26,000,000) | 3,000,000 | 27,000,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of beneficial interests | $ 0 | $ 0 | $ 0 | $ 9,000,000 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary | Level 3 | Fair Value, Measurements, Recurring | Measurement Input, Weighted Average Discount Rate | Valuation Technique, Discounted Cash Flow |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Measurement input, discount rate | 0.092 |  | 0.092 |  |  |  | 0.097 |
Minimum | Variable Interest Entity, Not Primary Beneficiary | Level 3 | Fair Value, Measurements, Recurring | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Measurement input, discount rate | 0.055 |  | 0.055 |  |  |  | 0.06 |
Maximum | Variable Interest Entity, Not Primary Beneficiary | Level 3 | Fair Value, Measurements, Recurring | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Measurement input, discount rate | 0.10 |  | 0.10 |  |  |  | 0.10 |

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