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Investments - BeiGene, Ltd. (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | $ 5,482,000,000 |  | $ 4,188,000,000
Net unrealized gains (loss) | 0 | $ 0 |
BeiGene |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Net unrealized gains (loss) | 1,700,000,000 | $ (454,000,000) |
Other Noncurrent Assets |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | $ 291,000,000 |  | 314,000,000
BeiGene | Maximum |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Ownership percentage | 5.00% | 5.00% |
BeiGene | Other Noncurrent Assets | BeiGene |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | $ 5,200,000,000 |  | $ 3,500,000,000

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