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Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Realized and unrealized gains (losses) on financial instruments, net | $ 79 | $ (15)
Equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Realized and unrealized gains (losses) on financial instruments, net | (6) | 0
Exchangeable senior debentures |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Realized and unrealized gains (losses) on financial instruments, net | $ 85 | $ (15)

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