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Debt (Long-Term Debt Footnote C) (Details) (4.45% U.S. Dollar Notes Due 2016 [Member], USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Dec. 31, 2011
May 31, 2009
Dec. 29, 2012
Mar. 31, 2012
Feb. 28, 2011
4.45% U.S. Dollar Notes Due 2016 [Member]
         
Debt Instrument [Line Items]          
Debt instrument, face amount   $ 750      
Debt Instrument term, in years   7 years      
Debt instrument, stated interest rate   4.45%      
Debt instrument, effective interest rate     3.29%    
Notional amounts of interest rate swaps       500 200
Fair value adjustment for interest rate swaps $ 14   $ 23