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Summary of Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Customer discounts | $ 12,500 | $ 12,300 | $ 12,300
Accrual for chargebacks reflected as direct reduction to accounts receivable | 188 | 178 |
Accrual for rebates included in accrued and other current liabilities | $ 2,300 | 2,700 |
Product return period and expiration | 12 months |  |
Depreciation | $ 1,828 | 1,824 | 1,578
Advertising and promotion costs | $ 2,300 | $ 2,200 | $ 2,000
Minimum |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Product return period | 3 months |  |
Estimated useful life of intangible assets | 2 years |  |
Minimum | Capitalized Software |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Estimated useful life of intangible assets | 2 years |  |
Minimum | Buildings |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Estimated useful life of property, plant and equipment | 25 years |  |
Minimum | Machinery, equipment and office furnishings |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Estimated useful life of property, plant and equipment | 3 years |  |
Minimum | United States |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Payment terms, vaccine sales | 30 days |  |
Minimum | United States | Pharmaceutical segment |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Payment terms | 36 days |  |
Minimum | United States | Animal Health |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Payment terms | 30 days |  |
Minimum | Outside of the United States |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Payment terms | 30 days |  |
Maximum |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Product return period | 6 months |  |
Estimated useful life of intangible assets | 24 years |  |
Maximum | Capitalized Software |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Estimated useful life of intangible assets | 10 years |  |
Maximum | Buildings |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Estimated useful life of property, plant and equipment | 45 years |  |
Maximum | Machinery, equipment and office furnishings |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Estimated useful life of property, plant and equipment | 15 years |  |
Maximum | United States |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Payment terms | 90 days |  |
Payment terms, vaccine sales | 60 days |  |
Maximum | Outside of the United States |  |  |
Intangible Assets Excluding Goodwill [Line Items] |  |  |
Payment terms | 90 days |  |

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