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Investments - BeiGene (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |
Net unrealized gains | $ 50 | $ 5 |
Equity securities | 3,985 |  | $ 4,514
Other Noncurrent Assets |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 536 |  | 494
Equity securities without readily determinable fair value | 333 |  | 309
BeiGene |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Net unrealized gains | $ (454) | $ 1,900 |
BeiGene | Maximum |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Ownership percentage | 5.00% | 5.00% |
BeiGene | Other Noncurrent Assets |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | $ 3,000 |  | $ 3,400

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