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Fair Value Measurements - Gains (Losses) on Financial Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total | $ 7 | $ 82 | $ 4 | $ 100
Gain (loss) on specific credit risk | $ (8) | 18 |  |
2.75% Exchangeable Senior Debentures | Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Stated interest rate (as a percent) | 2.75% |  | 2.75% |
Debt measured at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total | $ 7 | 80 | $ 4 | 95
Gain (loss) on specific credit risk |  |  | (7) | (13)
Cumulative loss on credit risk | 16 |  | 16 |
Other |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total | $ 0 | $ 2 | $ 0 | $ 5

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