Investments - Unrealized Gains and Losses on Equity Investments (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Investments [Abstract] | ||||
| Net gains (losses) recognized during the period on equity investments | $ (4) | $ 61 | $ (6) | $ (185) |
| Less: Net gains recognized on equity investments sold during the period | 0 | 84 | 2 | 78 |
| Total unrealized losses on equity investments held, end of period | $ (4) | $ (23) | $ (8) | $ (263) |