Financing Transactions (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 28, 2013	Jun. 28, 2013	Jun. 29, 2012	Dec. 31, 2012	May 31, 2012
Debt Instrument [Line Items]
Repayments of senior notes		$ 310,400,000	$ 2,200,000
Weighted average maturity of commercial paper	22 days
Common stock, par value (dollars per share)	$ 0.01	$ 0.01		$ 0.01	$ 0.01
Commercial paper	450,000,000	450,000,000		1,224,500,000
2013 Notes
Debt Instrument [Line Items]
Repayments of senior notes	(300,000,000)
Liquid Yield Option Notes (LYONs)
Debt Instrument [Line Items]
Shares issued under debt conversion (shares)		4.2
Deferred tax liability, basis difference in LYONs	39,000,000	39,000,000
Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowings outstanding under credit facility	0	0
U.S Commercial Paper
Debt Instrument [Line Items]
Weighted average interest rate of short-term debt (interest rate)	0.20%	0.20%
Commercial Paper [Member]
Debt Instrument [Line Items]
Line of credit	2,500,000,000	2,500,000,000
Euro-Denominated Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial paper	$ 0	$ 0