Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 25, 2010		Dec. 26, 2009
Repurchase Of Shares Of The Company's Common Stock [Line Items]
Shares Repurchased (in shares)	14,305,000	[1]	9,759,000	[1]	0
Dollar Value of Shares Repurchased	$ 733	[1]	$ 390	[1]	$ 0
Value of share repurchases in current fiscal year but with settlement dates in subsequent year			19
Value of share repurchases in current fiscal year but with settlement dates in subsequent year (in shares)			400,000
Accumulated other comprehensive income (loss), net of tax [Abstract]
Foreign currency translation adjustment	140		55
Pension and post-retirement losses, net of tax	(375)		(269)
Net unrealized losses on derivative instruments, net of tax	(12)		(13)
Total accumulated other comprehensive income (loss)	(247)		(227)
November 2011 [Member]
Repurchase Of Shares Of The Company's Common Stock [Line Items]
Shares Repurchased (in shares)	0		0		0
Dollar Value of Shares Repurchased	0		0		0
Authorized Share Repurchases	750
Expiration Date Of Share Repurchase Authorization	May 2013
January 2011 [Member]
Repurchase Of Shares Of The Company's Common Stock [Line Items]
Shares Repurchased (in shares)	10,864,000		0		0
Dollar Value of Shares Repurchased	562		0		0
Remaining dollar value of shares that may be repurchased	188
March 2010 [Member]
Repurchase Of Shares Of The Company's Common Stock [Line Items]
Shares Repurchased (in shares)	3,441,000		2,161,000		0
Dollar Value of Shares Repurchased	171		107		0
September 2009 [Member]
Repurchase Of Shares Of The Company's Common Stock [Line Items]
Shares Repurchased (in shares)	0		7,598,000		0
Dollar Value of Shares Repurchased	$ 0		$ 283		$ 0

[1] 2011 amount excludes and 2010 amount includes the effect of $19 million in share repurchases (0.4 million shares) with trade dates prior to the 2010 fiscal year end but cash settlement dates subsequent to the 2010 fiscal year.