Equity - Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
COGS	$ 2,151	$ 1,950	$ 4,300	$ 4,038
SG&A	(735)	(840)	(1,477)	(1,720)
Interest expense	72	63	141	124
Net experience loss	1	0	2	(1)
Total before tax	471	385	982	692
Tax expense (benefit)	(70)	(102)	(137)	(145)
Net income	599	283	1,043	549	$ 1,254
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Net income	0	2	1	4
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Total before tax	2	2	4	4
Tax expense (benefit)	(1)	0	(1)	(1)
Net income	1	2	3	3
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)
SG&A		0		0
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	2	4	5
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
COGS		0		0
Reclassification out of Accumulated Other Comprehensive Income | Amortization of postretirement and postemployment benefits
Derivative Instruments, Gain (Loss) [Line Items]
Net experience loss		0		1
Prior service cost		0		0
Total before tax	(1)	0	(2)	1
Tax expense (benefit)	0	0	0	0
Net income	(1)	$ 0	(2)	$ 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)		$ (2)