Financial Instruments - Financial Liabilities Not Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 29, 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	$ 36,281	$ 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	40,062	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	$ 40,062	$ 40,842