Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 29,875	$ 28,729	$ 29,675	$ 27,586
Other comprehensive items before reclassifications			(314)
Amounts reclassified from accumulated other comprehensive items			23
Total other comprehensive items	19	(92)	(291)	(224)
Balance	31,824	29,355	31,824	29,355
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(2,320)
Other comprehensive items before reclassifications			(244)
Amounts reclassified from accumulated other comprehensive items			0
Total other comprehensive items			(244)
Balance	(2,564)		(2,564)
Unrealized Losses on Hedging Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(71)
Other comprehensive items before reclassifications			(65)
Amounts reclassified from accumulated other comprehensive items			10
Total other comprehensive items			(55)
Balance	(126)		(126)
Pension and Other Postretirement Benefit Liability Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(288)
Other comprehensive items before reclassifications			(5)
Amounts reclassified from accumulated other comprehensive items			13
Total other comprehensive items			8
Balance	(280)		(280)
Accumulated Other Comprehensive Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,989)	(2,630)	(2,679)	(2,498)
Total other comprehensive items	19	(92)	(291)	(224)
Balance	$ (2,970)	$ (2,722)	$ (2,970)	$ (2,722)