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Investments - BeOne Medicines Ltd (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity securities | $ 6,819 |  | $ 6,819 |  | $ 4,188
BeOne Medicines Ltd |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Net unrealized gains | 1,900 | $ 1,600 | 3,000 | $ 836 |
Other Noncurrent Assets |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity securities | $ 300 |  | $ 300 |  | 314
BeOne Medicines Ltd | Maximum |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Ownership percentage | 5.00% | 5.00% | 5.00% | 5.00% |
BeOne Medicines Ltd | Other Noncurrent Assets | BeOne Medicines Ltd |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity securities | $ 6,500 |  | $ 6,500 |  | $ 3,500

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