Subsequent Event (Details) (USD $)		6 Months Ended		0 Months Ended
	Jun. 29, 2013 U.S. Commercial Paper Program [Member]	Jun. 29, 2013 Revolving Credit Facility [Member]	Aug. 02, 2013 Subsequent Event [Member] 364-day Unsecured Bridge Financing	Jul. 25, 2013 Subsequent Event [Member] Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Maximum Borrowing Capacity		$ 1,000,000,000	$ 3,560,000,000	$ 1,500,000,000
Line of Credit Facility, Expiration Date		Apr. 30, 2017
Debt, Covenant, Maximum Consolidated Total Leverage Ratio of Debt to EBITDA				3.5
Debt, Covenant, Maximum Consolidated Total Leverage Ratio of Debt to EBITDA First Six Months				5.5
Debt, Covenant, Maximum Consolidated Total Leverage Ratio Of Debt To EBITDA After Eighteen Months				3.5
Debt, Covenant, Minimum Consolidated Interest Coverage Ratio				3.0
Bridge Facility, Reduction to Maximum Borrowing Capacity			1,500,000,000
Short-term Financing [Line Items]
Short-term Borrowings	$ 50,000,000