Equity - Reclassification of AOCI (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification to net income, pre-tax	$ 0	$ (2)	$ (11)	$ (4)
Tax (expense) benefit	0		(3)
Net of tax	0	(2)	(8)	(4)
Postretirement and Postemployment Benefits Reclassification To Net Income Pre Tax [Abstract]
Net experience loss, pre-tax	1	1	3	4
Prior service cost, pre-tax	2	4	8	10
Total before tax	3	5	11	14
Postretirement and Postemployment Benefits Reclassification To Net Income After Tax [Abstract]
Tax (expense) benefit	(1)	(1)	(3)	(3)
Net of tax	2	4	8	11
Total reclassifications for the quarter, net of tax	2	(2)	0	(7)
Foreign Currency Exchange Contracts [Member] | Selling General and Administrative Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification to net income, pre-tax		(1)		(1)
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification to net income, pre-tax		(2)		(4)
Net of tax		(2)		(4)
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	0	(2)	(2)	(7)
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)		(5)
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)	(3)
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	$ 5	$ 7