Investments - Unrealized Gains (Losses) Included in the Carrying Value of Measurement Alternative Investments and Marketable Securities (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Investments, Debt and Equity Securities [Abstract] | |||
| Upward adjustments | $ 11 | $ 7 | $ 114 |
| Downward adjustments (including impairment) | (9) | (145) | (23) |
| Marketable Securities, Unrealized Gain (Loss) | $ (34) | $ 97 | $ (213) |