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Investments - BeiGene, Ltd. (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Net unrealized gains (losses) | $ (50) | $ 3 | $ 0 | $ 0 |
BeiGene |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fair value of investments | 2,700 |  | 2,700 |  | $ 3,400
Net unrealized gains (losses) | $ (260) | $ (705) | $ (714) | $ 1,200 |
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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