Financial Instruments - Fair Value And Cash Flow Hedges (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Financial Instruments [Abstract]
Cost of sales	[1],[2]	$ 2,694	$ 2,844	$ 8,173	$ 7,972
Other (income)/deductions––net	[1]	$ (414)	$ 79	$ (1,143)	$ 65

[1] Amounts may not add due to rounding.

[2] Excludes amortization of intangible assets, except as disclosed in Note 9A. Identifiable Intangible Assets and Goodwill: Identifiable Intangible Assets.