Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 23, 2013		Mar. 24, 2012	Dec. 29, 2012
Repurchase Of Shares Of Common Stock [Line Items]
Dollar Value of Shares Repurchased	$ 78	[1]	$ 78
Remaining dollar value of shares that may be repurchased	875
Shares Repurchased	1,198,000	[1]	1,219,000
Value Of Share Repurchases In Current Fiscal Quarter But With Settlement Dates In Subsequent Fiscal Quarter				20
Share Repurchases In Current Fiscal Quarter But With Settlement Dates In Subsequent Fiscal Quarter				300,000
January 2011 [Member]
Repurchase Of Shares Of Common Stock [Line Items]
Dollar Value of Shares Repurchased	0		78
Remaining dollar value of shares that may be repurchased	0
Expiration Date	June 2012
Shares Repurchased	0		1,219,000
November 2012 [Member]
Repurchase Of Shares Of Common Stock [Line Items]
Dollar Value of Shares Repurchased	78		0
Remaining dollar value of shares that may be repurchased	$ 875
Expiration Date	May 2014
Shares Repurchased	1,198,000		0

[1] Amount excludes the effect of $20 million in share repurchases (0.3 million shares) with trade dates prior to the 2012 fiscal year end but cash settlement dates subsequent to the 2012 fiscal year end.