Investments - Unrealized Gains (Losses) Included in the Carrying Value of Measurement Alternative Investments and Marketable Securities (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Upward adjustments | $ 1 | $ 4 | $ 1 | $ 6 |
| Downward adjustments (including impairment) | (2) | (27) | (23) | (30) |
| Unrealized gains (losses), net | $ (5) | $ 29 | $ (50) | $ (3) |