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Investments - BeiGene, Ltd. (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity securities | $ 5,057 |  | $ 5,057 |  | $ 4,514
Net unrealized gains | 0 | $ 0 | 0 | $ 0 |
Other Noncurrent Assets |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity securities | 336 |  | 336 |  | 494
BeiGene |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Net unrealized gains | 1,600 | $ 30 | 836 | $ 1,200 |
BeiGene | Other Noncurrent Assets |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity securities | $ 4,300 |  | $ 4,300 |  | $ 3,400
BeiGene |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Ownership percentage | 18.00% |  | 18.00% |  | 18.00%
BeiGene | Maximum |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Ownership percentage | 5.00% | 5.00% | 5.00% | 5.00% |

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