Financial Instruments - Cumulative Net Gains on Equity Securities Sold (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2023 |
Jun. 30, 2022 |
Jun. 30, 2023 |
Jun. 30, 2022 |
|
| Fair Value Disclosures [Abstract] | ||||
| Total sale price | $ 427 | $ 645 | $ 739 | $ 1,335 |
| Total initial cost | 156 | 168 | 367 | 428 |
| Cumulative net gain (loss) | $ 271 | $ 477 | $ 372 | $ 907 |