Investments - Unrealized Gains (Losses) Included in the Carrying Value of Measurement Alternative Investments (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Investments, Debt and Equity Securities [Abstract] | |||
| Upward adjustments | $ 114 | $ 468 | $ 21 |
| Downward adjustments (including impairment) | (23) | (2) | (3) |
| Marketable Securities, Unrealized Gain (Loss) | $ (213) | $ 8 | $ (5) |