Investments - Unrealized Gains (Losses) Included in the Carrying Value of Measurement Alternative Investments and Marketable 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] | ||||
| Upward adjustments | $ 13 | $ 25 | $ 14 | $ 31 |
| Downward adjustments (including impairment) | (22) | (2) | (45) | (32) |
| Unrealized gains (losses), net | $ 0 | $ 14 | $ (50) | $ 11 |