Equity - Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
COGS	$ 2,293	$ 2,074	$ 6,593	$ 6,112
SG&A	(780)	(839)	(2,257)	(2,559)
Interest expense	72	64	213	188
Net experience loss	1	0	3	(1)
Prior service cost	(1)		(1)
Total before tax	454	386	1,436	1,078
Tax expense (benefit)	(69)	(101)	(206)	(246)
Net income	383	288	1,426	837	$ 1,254
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Net income	0	2	1	6
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Total before tax	2	3	6	7
Tax expense (benefit)	(1)	(1)	(2)	(2)
Net income	1	2	4	5
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Foreign currency exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
COGS	0	0	0	(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	2	3	6	8
Reclassification out of Accumulated Other Comprehensive Income | Amortization of postretirement and postemployment benefits
Derivative Instruments, Gain (Loss) [Line Items]
Net experience loss		0		1
Total before tax	(1)	0	(3)	1
Tax expense (benefit)	0	0	0	0
Net income	(1)	$ 0	(3)	$ 1
Reclassification out of Accumulated Other Comprehensive Income | Amortization of postretirement and postemployment benefits | Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Net experience loss	$ (1)		$ (3)