Equity - Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Derivative Instruments, Gain (Loss) [Line Items]
COGS	$ 2,372	$ 2,293	$ 7,062	$ 6,593
SG&A	(737)	(780)	(2,252)	(2,257)
Interest expense	72	72	221	213
Net experience (gain) loss	1	1	3	3
Prior service cost		(1)		(1)
Other (Income) expense	150	130	247	269
Total before tax	341	454	1,067	1,436
Tax expense (benefit)	(91)	(69)	(237)	(206)
Net income	248	383	825	1,426
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Net income	(6)	0	(5)	1
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Total before tax	(1)	2	2	6
Tax expense (benefit)	0	(1)	(1)	(2)
Net income	(1)	1	1	4
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	(1)	2	2	6
Reclassification out of Accumulated Other Comprehensive Income | Amortization of postretirement and postemployment benefits
Derivative Instruments, Gain (Loss) [Line Items]
Total before tax	(1)	(1)	(3)	(3)
Tax expense (benefit)	0	0	1	0
Net income	(1)	(1)	(2)	(3)
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	(1)	$ (1)	(3)	$ (3)
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 | (Gains) losses on available-for-sale securities | Other income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Other (Income) expense	$ (4)		$ (4)