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) |