Equity - Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Apr. 02, 2016	Apr. 04, 2015	Jan. 02, 2016
Derivative Instruments, Gain (Loss) [Line Items]
COGS	$ (2,150)	$ (2,311)
SGA	(807)	(861)
Interest expense	(217)	(54)
Net experience loss	(1)	(1)
Prior service cost	0	3
Total before tax	221	304
Tax (expense) benefit	(47)	(76)
Net income	175	227	$ 614
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Net income	2	(1)
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Total before tax	2	(4)
Tax (expense) benefit	(1)	0
Net income	1	(4)
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Foreign currency exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
COGS	(7)	(7)
SGA	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	6	0
Reclassification out of Accumulated Other Comprehensive Income | (Gains) losses on cash flow hedges | Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
COGS	3	3
Reclassification out of Accumulated Other Comprehensive Income | Amortization of postretirement and postemployment benefits
Derivative Instruments, Gain (Loss) [Line Items]
Net experience loss	1	1
Prior service cost	0	3
Total before tax	1	4
Tax (expense) benefit	0	(1)
Net income	$ 1	$ 3