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Fair Value Measurements - Gains (Losses) on Financial Instruments (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | $ (3) | $ 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% |
Debt measured at fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | $ (3) | 15
Gain (loss) on specific credit risk | (1) | (31)
Cumulative loss on credit risk | 8 |
Other |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total | $ 0 | $ 3

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