Investments - Carrying Value of Measurement Alternative Investments (Details) - USD ($) $ in Millions |
Dec. 31, 2022 |
Dec. 31, 2021 |
|---|---|---|
| Investments, Debt and Equity Securities [Abstract] | ||
| Initial cost basis | $ 503 | |
| Upward adjustments | 620 | |
| Downward adjustments (including impairment) | (36) | |
| Measurement alternative | $ 1,087 | $ 952 |