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Stock Transactions And Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jul. 03, 2015
Jul. 03, 2015
Jul. 03, 2015
Jun. 27, 2014
Jul. 16, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock repurchase program, authorized shares to be repurchased         20,000
Stock repurchase program, remaining number of shares authorized to be repurchased 20,000 20,000 20,000    
Common shares reserved for issuance under the 2007 Stock Incentive Plan, shares 24,000 24,000 24,000    
Total number of shares withheld sufficient to fund minimum tax withholding requirements related to exercising of stock options and vesting of RSUs, shares     284    
Total value of shares withheld sufficient to fund minimum tax withholding requirements related to exercising of stock options and vesting of RSUs     $ 25    
PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Share-based compensation arrangement by share-based payment award, percentage of awards granted     25.00%    
RSUs/PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, percentage of awards granted     25.00%    
Total unrecognized compensation cost $ 141 $ 141 $ 141    
Weighted average period for cost to be recognized 3 years        
Tax benefit realized related to exercise of options   2 $ 21    
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, percentage of awards granted     50.00%    
Total unrecognized compensation cost $ 122 122 $ 122    
Weighted average period for cost to be recognized 3 years        
Aggregate intrinsic value of options exercised     163 $ 71  
Cash receipts due to exercise of options     108 $ 56  
Tax benefit realized related to exercise of options   $ 26 $ 52