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Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Realized and unrealized gains (losses) on financial instruments |  |  |  |
Realized and unrealized gains (losses) on financial instruments, net | $ (21) | $ (10) | $ (36) | $ (17)
Change in fair value of exchangeable senior debentures realized gain (loss) | 176 | 92 | 229 | (38)
Cumulative amount of gain in change in fair value | 742 |  | 742 |
Equity securities |  |  |  |
Realized and unrealized gains (losses) on financial instruments |  |  |  |
Realized and unrealized gains (losses) on financial instruments, net | (1) |  | (1) | (2)
Exchangeable senior debentures |  |  |  |
Realized and unrealized gains (losses) on financial instruments |  |  |  |
Realized and unrealized gains (losses) on financial instruments, net | $ (20) | $ (10) | $ (35) | $ (15)

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