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Share-Based Compensation (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 0 Months Ended
Sep. 26, 2014
Sep. 27, 2013
Sep. 26, 2014
Sep. 27, 2013
Sep. 26, 2014
Restricted Stock Units (RSUs) [Member]
Sep. 26, 2014
2016 LTIP [Member]
Sep. 26, 2014
2016 LTIP [Member]
Minimum [Member]
Sep. 26, 2014
2016 LTIP [Member]
Maximum [Member]
May 06, 2014
2016 LTIP [Member]
Performance Shares [Member]
May 06, 2014
2014 LTIP [Member]
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation awards granted in period                 1,100 370
Percentage of grants with performance vesting - Operating ratio           50.00%        
Percentage of grants with performance vesting - Return on assets           50.00%        
Share-based compensation awards - payout range for participants             0.00% 200.00%    
Share-based compensation awards - adjustment to payout percentage           30.00%        
Share-based compensation award vesting period         3 years          
Share-Based Compensation Expense $ 9 $ 7 $ 20 $ 9            
Income Tax Benefit $ 4 $ 3 $ 8 $ 4