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Stock Transactions And Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended
Apr. 01, 2016
Apr. 01, 2016
Apr. 03, 2015
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    
Common shares reserved for issuance under the 2007 Stock Incentive Plan, shares 19,000 19,000    
Total number of shares withheld sufficient to fund minimum tax withholding requirements related to exercising of stock options and vesting of RSUs, shares   298    
Total value of shares withheld sufficient to fund minimum tax withholding requirements related to exercising of stock options and vesting of RSUs   $ 26    
RSUs/PSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost $ 241 241    
Weighted average period for cost to be recognized 3 years      
Tax benefit realized related to exercise of options   22    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost $ 188 188    
Weighted average period for cost to be recognized 3 years      
Aggregate intrinsic value of options exercised   58 $ 81  
Cash receipts due to exercise of options   49 $ 52  
Tax benefit realized related to exercise of options   $ 18