Equity - Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014	Jan. 03, 2015
Derivative Instruments, Gain (Loss) [Line Items]
COGS	$ (2,096)	$ (2,347)	$ (6,664)	$ (6,859)
SGA	(899)	(927)	(2,589)	(2,761)
Interest expense	(56)	(54)	(168)	(156)
Net experience loss	1	1	3	3
Prior service cost	2	2	7	8
Total before tax	272	312	884	1,304
Tax (expense) benefit	(66)	(86)	(227)	(373)
Net income	205	225	654	926	$ 633
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Net income	(3)	2	(5)	0
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Total before tax	(7)	0	(14)	(11)
Tax (expense) benefit	1	0	1	3
Net income	(6)	0	(13)	(8)
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Foreign currency exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
COGS	(11)	0	(27)	(2)
SGA	0	(2)	2	(5)
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	0	2	(9)
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
COGS	3	2	9	5
Reclassification out of Accumulated Other Comprehensive Income | Amortization of postretirement and postemployment benefits
Derivative Instruments, Gain (Loss) [Line Items]
Net experience loss	1	1	3	3
Prior service cost	2	2	7	8
Total before tax	3	3	10	11
Tax (expense) benefit	0	(1)	(2)	(3)
Net income	$ 3	$ 2	$ 8	$ 8