Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 27,693	$ 26,123	$ 27,586	$ 25,413
Other comprehensive items before reclassifications			(142)
Amounts reclassified from accumulated other comprehensive items			10
Total other comprehensive items	(121)	(449)	(132)	(400)
Balance	28,729	26,445	28,729	26,445
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(2,243)
Other comprehensive items before reclassifications			(131)
Total other comprehensive items			(131)
Balance	(2,374)		(2,374)
Unrealized Losses on Hedging Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(52)
Other comprehensive items before reclassifications			0
Amounts reclassified from accumulated other comprehensive items			5
Total other comprehensive items			5
Balance	(47)		(47)
Pension and Other Postretirement Benefit Liability Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(203)
Other comprehensive items before reclassifications			(11)
Amounts reclassified from accumulated other comprehensive items			5
Total other comprehensive items			(6)
Balance	(209)		(209)
Accumulated Other Comprehensive Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,509)	(2,042)	(2,498)	(2,003)
Total other comprehensive items	(121)	(449)	(132)	(400)
Balance	$ (2,630)	$ (2,491)	$ (2,630)	$ (2,491)