Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 28,559	$ 27,693	$ 29,675	$ 27,586
Other comprehensive items before reclassifications			(320)
Amounts reclassified from accumulated other comprehensive items			10
Total other comprehensive items	99	(121)	(310)	(132)
Balance	29,875	28,729	29,875	28,729
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(2,320)
Other comprehensive items before reclassifications			(254)
Amounts reclassified from accumulated other comprehensive items			0
Total other comprehensive items			(254)
Balance	(2,574)		(2,574)
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			4
Total other comprehensive items			(61)
Balance	(132)		(132)
Pension and Other Postretirement Benefit Liability Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(288)
Other comprehensive items before reclassifications			(1)
Amounts reclassified from accumulated other comprehensive items			6
Total other comprehensive items			5
Balance	(283)		(283)
Accumulated Other Comprehensive Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(3,088)	(2,509)	(2,679)	(2,498)
Total other comprehensive items	99	(121)	(310)	(132)
Balance	$ (2,989)	$ (2,630)	$ (2,989)	$ (2,630)