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Share-Based Compensation (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended
Jun. 27, 2014
Jun. 28, 2013
Jun. 27, 2014
Jun. 28, 2013
Jun. 27, 2014
Restricted Stock Units (RSUs) [Member]
Jun. 27, 2014
2016 LTIP [Member]
Jun. 27, 2014
2016 LTIP [Member]
Minimum [Member]
Jun. 27, 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                 1,000 370
Share-based compensation awards - payout range for participants             0.00% 200.00%    
Share-based compensation awards - adjustment to payout percentage           30.00%        
Percentage of grants with performance vesting - Operating ratio           50.00%        
Percentage of grants with performance vesting - Return on assets           50.00%        
Share-based compensation award vesting period         3 years          
Share-Based Compensation Expense $ 6 $ 5 $ 11 $ 2            
Income Tax Benefit $ 2 $ 2 $ 4 $ 1