Investments - Equity Securities (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Realized gain (loss) recognized in gain on investments, net | $ 0 | $ (1) | $ 1 | $ (4) |
| Unrealized gain recognized in gain on investments, net | $ 0 | $ 1 | $ 3 | $ 2 |