Treasury Stock (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Jun. 30, 2012	Jun. 25, 2011
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]
Board-approved share repurchase program of common stock			$ 1,000,000,000
Stock repurchase period			April 2015
Repurchased shares under the share repurchase program	1,106,000	1,145,000	1,160,700	2,156,500
Cost of share repurchased under the share repurchase program	98,400,000	69,700,000	102,536,000	122,873,000
Remaining authorization under the share repurchase program			$ 460,400,000