Equity - Reclassification of AOCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification to net income, pre-tax	$ (1)	$ (2)	$ (11)	$ (2)
Tax (expense) benefit	0		(3)
Net of tax	(1)	(2)	(8)	(2)
Postretirement and Postemployment Benefits Reclassification To Net Income Pre Tax [Abstract]
Net experience loss, pre-tax	1	1	2	3
Prior service cost, pre-tax	4	3	6	6
Total before tax	5	4	8	9
Postretirement and Postemployment Benefits Reclassification To Net Income After Tax [Abstract]
Tax (expense) benefit	(1)	(1)	(2)	(2)
Net of tax	4	3	6	7
Total reclassifications for the quarter, net of tax	3	(1)	(2)	(5)
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification to net income, pre-tax		(2)		(2)
Net of tax		(2)		(2)
Cash Flow Hedging [Member] | Foreign Currency Exchange Contracts [Member] | Cost of Goods Sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification to net income, pre-tax	(1)	(3)	(2)	(5)
Cash Flow Hedging [Member] | Foreign Currency Exchange Contracts [Member] | Selling General and Administrative Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification to net income, pre-tax	(2)		(3)
Cash Flow Hedging [Member] | Interest Rate Contracts [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification to net income, pre-tax	0	(1)	(9)	(2)
Cash Flow Hedging [Member] | Commodity Contracts [Member] | Cost of Goods Sold [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification to net income, pre-tax	$ 2	$ 2	$ 3	$ 5