Debt And Credit Facilities (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012 Scheduled To Mature On June Thirty Two Thousand Fourteen [Member]	May 31, 2012 Three Point Seven Five Zero Percent Senior Notes Due 2022 [Member]	May 31, 2012 Five Point Three Seven Five Percent Senior Notes Due November 2012 [Member]
Line of Credit Facility [Line Items]
Face principal amount of debt issued							$ 750,000,000
Debt instrument stated interest rate (percent)							3.75%	5.375%
Aggregate principal amount of debt to be redeemed	1,900,000,000	1,900,000,000		1,900,000,000				400,000,000
Debt redemption aggregate purchase price	408,000,000
Loss from the extinguishment of long-term debt		6,000,000	81,000,000	6,000,000	81,000,000
Unsecured syndicated revolving credit facility						1,500,000,000
Aggregate credit facility size up to a maximum						$ 2,000,000,000