Equity - Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Derivative Instruments, Gain (Loss) [Line Items]
COGS	$ 2,228	$ 2,372	$ 6,764	$ 7,062
SG&A	(790)	(737)	(2,166)	(2,252)
Interest expense	63	72	196	221
Net experience (gain) loss	0	1	2	3
Prior service cost	0		(1)
Other (Income) expense	70	150	151	247
Total before tax	418	341	1,331	1,067
Tax expense (benefit)	(65)	(91)	(268)	(237)
Net income	352	248	1,056	825
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Net income	3	(6)	6	(5)
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Total before tax	4	(1)	11	2
Tax expense (benefit)	(1)	0	(3)	(1)
Net income	3	(1)	8	1
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	4	(1)	11	2
Reclassification out of Accumulated Other Comprehensive Income | Amortization of postretirement and postemployment benefits
Derivative Instruments, Gain (Loss) [Line Items]
Total before tax	0	(1)	(3)	(3)
Tax expense (benefit)	0	0	1	1
Net income	0	(1)	(2)	(2)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of postretirement and postemployment benefits | Other income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Net experience (gain) loss	0	(1)	(2)	(3)
Prior service cost	$ 0		$ (1)
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on available-for-sale securities
Derivative Instruments, Gain (Loss) [Line Items]
Total before tax		(4)		(4)
Tax expense (benefit)		0		0
Net income		(4)		(4)
Corporate bonds | Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on available-for-sale securities | Other income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Other (Income) expense		$ (4)		$ (4)