Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 29, 2012		Dec. 31, 2011		Dec. 25, 2010
Repurchase Of Shares Of The Company's Common Stock [Line Items]
Shares Repurchased (in shares)	14,891,000	[1]	14,305,000	[2]	9,759,000	[2]
Dollar Value of Shares Repurchased	$ 985	[1]	$ 733	[2]	$ 390	[2]
Value of share repurchases in current fiscal year but with settlement dates in subsequent year	20		19
Value of share repurchases in current fiscal year but with settlement dates in subsequent year (in shares)	300,000		400,000
Accumulated other comprehensive income (loss), net of tax [Abstract]
Foreign currency translation adjustment	166		140
Pension and post-retirement losses, net of tax	(286)		(375)
Net unrealized losses on derivative instruments, net of tax	(12)		(12)
Total accumulated other comprehensive income (loss)	(132)		(247)
Current year additions to translation adjustments and gains (losses) from intra-entity transactions of investment nature, net of tax and reclassifications	26
Tax (expense) benefit on translation adjustments and gains (losses) from intra-entity transactions of a long-term investment nature	(3)		3		5
Reclassifications of currency translation adjustments into Net Income	3		0		0
November 2012 [Member]
Repurchase Of Shares Of The Company's Common Stock [Line Items]
Shares Repurchased (in shares)	1,069,000		0		0
Dollar Value of Shares Repurchased	47		0		0
Remaining dollar value of shares that may be repurchased	953
Authorized Share Repurchases	1,000
November 2011 [Member]
Repurchase Of Shares Of The Company's Common Stock [Line Items]
Shares Repurchased (in shares)	11,035,000		0		0
Dollar Value of Shares Repurchased	750		0		0
Expiration Date Of Share Repurchase Authorization	May 2014
January 2011 [Member]
Repurchase Of Shares Of The Company's Common Stock [Line Items]
Shares Repurchased (in shares)	2,787,000		10,864,000		0
Dollar Value of Shares Repurchased	188		562		0
March 2010 [Member]
Repurchase Of Shares Of The Company's Common Stock [Line Items]
Shares Repurchased (in shares)	0		3,441,000		2,161,000
Dollar Value of Shares Repurchased	0		171		107
September 2009 [Member]
Repurchase Of Shares Of The Company's Common Stock [Line Items]
Shares Repurchased (in shares)	0		0		7,598,000
Dollar Value of Shares Repurchased	$ 0		$ 0		$ 283

[1] 2012 amount includes the effect of $20 million in share repurchases (0.3 million shares) with trade dates prior to December 29, 2012 but with settlement dates subsequent to December 29, 2012.

[2] 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.