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Investments - BeiGene (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 02, 2020
Net Investment Income [Line Items] |  |  |  |
Unrealized gain on equity method investment | $ 98 | $ (165) | $ 161 |
Company's share of profits (losses) of related party | (11) | $ (891) | $ (33) |
BeiGene |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Ownership percentage |  | 18.20% |  | 20.50%
Equity method investment, difference between carrying amount and underlying equity |  |  |  | $ 2,400
BeiGene |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Equity method investment, aggregate cost |  |  |  | 2,800
Equity method investment, quoted market value |  |  |  | $ 2,600
Unrealized gain on equity method investment | 1,200 |  |  |
Company's share of profits (losses) of related party | (394) | $ (265) |  |
Amortization of the basis difference | 190 | 172 |  |
Payments to acquire equity method investments, cash |  | 50 |  |
Increase in carrying value of equity method investment | 11 | 265 |  |
BeiGene | Other Noncurrent Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Approximate carrying value of the company's equity method investment |  | 2,200 |  |
Carrying and fair value of investment |  | $ 4,200 |  |
BeiGene | BeiGene | Other Noncurrent Assets |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Carrying and fair value of investment | $ 3,400 |  |  |

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