Restructuring and Productivity Initiatives (Narrative) (Details) $ in Millions	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 28, 2015 USD ($) employee factory	Mar. 29, 2015 USD ($)	Jun. 29, 2014 USD ($)	Jun. 28, 2015 USD ($) employee factory	Mar. 29, 2015 USD ($) employee	Jun. 29, 2014 USD ($)	Dec. 28, 2014 USD ($) factory
Restructuring Cost and Reserve [Line Items]
Restructuring, incurred costs	$ 35		$ 117	$ 52		$ 257
Severance related costs	$ 8		30	$ 13		84
Phase I
Restructuring Cost and Reserve [Line Items]
Number, positions eliminated | employee				4,050
License Expiration
Restructuring Cost and Reserve [Line Items]
Restructuring approximate number of positions affected | employee				200
Phase II
Restructuring Cost and Reserve [Line Items]
Number, positions eliminated | employee	400				1,050
Number, facilities eliminated | factory	2			2
Restructuring approximate number of positions affected | employee	700
Impairment of long-lived assets to be disposed of	$ 21						$ 30
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring, incurred costs	32		107	$ 48		225
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring, incurred costs	3		10	4		32
Severance and other severance related costs
Restructuring Cost and Reserve [Line Items]
Restructuring, incurred costs	8		30	13		84
Severance and other severance related costs | Phase I
Restructuring Cost and Reserve [Line Items]
Restructuring, incurred costs							$ 289
Severance and other severance related costs | Phase II
Restructuring Cost and Reserve [Line Items]
Restructuring, incurred costs		$ 68
Other exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring, incurred costs	2		25	12		38
Facility closing
Restructuring Cost and Reserve [Line Items]
Restructuring, incurred costs	$ 25		$ 62	$ 27		$ 135
Facility closing | Footprint
Restructuring Cost and Reserve [Line Items]
Number, facilities eliminated | factory							5
Restructuring approximate number of positions affected | employee				1,600
Restructuring, costs incurred to date		$ 91			$ 91
Facility closing | License Expiration
Restructuring Cost and Reserve [Line Items]
Number, facilities eliminated | factory							1
Severance related costs				$ 11
Impairment of long-lived assets to be disposed of				37
Loss on contract termination				$ 9