Debt Short-term Financing (Details) (USD $)	9 Months Ended
	Sep. 29, 2012
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000
Line of Credit Facility, Covenant, Maximum Consolidated Total Leverage Ratio of Debt to EBITDA	3.5
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,000,000,000
Line of Credit Facility, Expiration Date	Apr. 11, 2017
Line of Credit Facility, Optional Increase in Maximum Capacity	500,000,000
Letters of Credit Outstanding, Amount	49,000,000
Line of Credit Facility, Amount Outstanding	0
Short-term Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	500,000,000
Line of Credit Facility, Expiration Date	Apr. 10, 2013
Line of Credit Facility, Amount Outstanding	0
U.S. Commercial Paper Program [Member]
Short-term Financing [Line Items]
Short-term Borrowings	$ 50,000,000