Investments - Carrying Value of Measurement Alternative Investments (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Investments, Debt and Equity Securities [Abstract] | ||
| Initial cost basis | $ 932 | |
| Upward adjustments | 522 | |
| Downward adjustments (including impairment) | (212) | |
| Measurement alternative | $ 1,242 | $ 1,140 |