Equity - Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
COGS	$ 2,275	$ 2,151	$ 4,690	$ 4,300
SG&A	(789)	(735)	(1,515)	(1,477)
Interest expense	75	72	149	141
Net experience (gain) loss	1	1	2	2
Total before tax	367	471	726	982
Tax expense (benefit)	(74)	(70)	(146)	(137)
Net income	292	599	577	1,043
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Net income		0	1	1
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Total before tax	2	2	3	4
Tax expense (benefit)	(1)	(1)	(1)	(1)
Net income	1	1	2	3
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	3	4
Reclassification out of Accumulated Other Comprehensive Income | Amortization of postretirement and postemployment benefits
Derivative Instruments, Gain (Loss) [Line Items]
Net experience (gain) loss		(1)		(2)
Total before tax	(1)	(1)	(2)	(2)
Tax expense (benefit)	1	0	1	0
Net income	0	$ (1)	(1)	$ (2)
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 (gain) loss	$ (1)		$ (2)