Financial Instruments - Financial Liabilities Not Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions		Sep. 27, 2020	Dec. 31, 2019
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, excluding the current portion	[1]	$ 49,785	$ 35,955
Estimated Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, excluding the current portion	[1]	59,073	40,842
Estimated Fair Value [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, excluding the current portion	[1]	$ 59,073	$ 40,842

[1] As of September 27, 2020, $11.4 billion of proceeds from the Upjohn debt transactions (see Note 7D) are invested in money market funds and included in Restricted short-term investments in the condensed consolidated balance sheet.