Equity Reclassifications Out of AOCI (Details) - USD ($) $ in Millions		12 Months Ended
		Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Derivative Instruments, Gain (Loss) [Line Items]
COGS		$ (8,844)	$ (9,517)	$ (8,689)
SGA		(3,590)	(4,039)	(3,266)
Interest expense		(227)	(209)	(235)
Net experience loss, pre-tax		3	3	5
Prior service cost		9	10	13
Total before tax		773	825	2,606
Tax (expense) benefit		(159)	(186)	(792)
Net income		614	633	1,808
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Net income		(12)	1	6
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Total before tax		(23)	(10)	(6)
Tax (expense) benefit		3	2	0
Net income		(20)	(8)	(6)
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Foreign currency exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
COGS		(40)	(5)	(10)
SGA		2	(3)	(2)
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense		3	(9)	(4)
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
COGS		12	7	10
Reclassification out of Accumulated Other Comprehensive Income | Amortization of postretirement and postemployment benefits
Derivative Instruments, Gain (Loss) [Line Items]
Net experience loss, pre-tax	[1]	3	3	5
Prior service cost	[1]	9	10	13
Total before tax		12	13	18
Tax (expense) benefit		(4)	(4)	(6)
Net income		$ 8	$ 9	$ 12

[1] See Note 9 and Note 10 for further details.