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Net Earnings Per Share (Narrative) (Details)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 26, 2014
Sep. 27, 2013
Sep. 26, 2014
Sep. 27, 2013
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share, amount 3 0 3 1