Investments - Unrealized Gains (Losses) Included in the Carrying Value of Measurement Alternative Investments and Marketable Securities (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Investments, Debt and Equity Securities [Abstract] | ||
| Upward adjustments | $ 0 | $ 2 |
| Downward adjustments (including impairment) | (30) | (3) |
| Unrealized gains (losses), net | $ (45) | $ (32) |