Financial Instruments - Total Short-Term and Long-Term Investments and Equity Method Investments - Footnotes (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 27, 2020 |
Sep. 29, 2019 |
|
| Debt Securities, Available-for-sale [Line Items] | ||
| Proceeds from issuance of long-term debt | $ 16,700 | $ 4,942 |
| Subsidiaries [Member] | Upjohn Inc [Member] | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Proceeds from issuance of long-term debt | $ 11,400 | |