Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives - Costs - Footnotes (Detail) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | 21 Months Ended | 27 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|---|
Dec. 14, 2023 |
Dec. 31, 2023 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| Restructuring Cost and Reserve [Line Items] | |||||||||
| Restructuring charge (credit) | [1] | $ 1,092 | $ 1,987 | $ 1,968 | |||||
| Seagen [Member] | |||||||||
| Restructuring Cost and Reserve [Line Items] | |||||||||
| Post closing compensation expense | $ 476 | ||||||||
| Seagen [Member] | Restructuring Charges and Acquisition-Related Costs [Member] | |||||||||
| Restructuring Cost and Reserve [Line Items] | |||||||||
| Post closing compensation expense | $ 476 | ||||||||
| Biopharma [Member] | |||||||||
| Restructuring Cost and Reserve [Line Items] | |||||||||
| Restructuring charge (credit) | 691 | 1,800 | 1,500 | ||||||
| Biopharma [Member] | Manufacturing Optimization Program [Member] | |||||||||
| Restructuring Cost and Reserve [Line Items] | |||||||||
| Restructuring charge (credit) | (288) | 1,200 | $ 875 | ||||||
| Biopharma [Member] | Realigning Our Cost Base Program [Member] | |||||||||
| Restructuring Cost and Reserve [Line Items] | |||||||||
| Restructuring charge (credit) | $ 920 | $ 571 | 1,400 | $ 2,900 | |||||
| Biopharma [Member] | Transforming to a More Focused Company Plan [Member] | |||||||||
| Restructuring Cost and Reserve [Line Items] | |||||||||
| Restructuring charge (credit) | $ 3 | ||||||||
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