Financial Instruments - Derivative Financial Instruments and Hedging Activities - Footnotes (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Derivative [Line Items]
Amount of (Gains)/Losses Reclassified from OCI into OID and COS	[1]	$ 143	$ (29)	$ (25)	$ (372)
Pre-tax loss expected to be reclassified within the next 12 months		192		192
Unsecured Debt [Member]
Derivative [Line Items]
Long-term debt		1,800		1,800
Foreign currency long-term debt [Member]
Derivative [Line Items]
Long-term debt		2,000		2,000
Designated as Hedging Instrument [Member] | Cost of sales [Member] | Foreign exchange contracts [Member]
Derivative [Line Items]
Amount of (Gains)/Losses Reclassified from OCI into OID and COS		$ (34)	$ (66)	$ (184)	$ (169)

[1] Reclassified into Other (income)/deductions—net and Cost of sales in the condensed consolidated statements of income. See Note 7E.