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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. 01, 2016
Jul. 01, 2016
Jul. 01, 2016
Jul. 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 20,000    
Common shares reserved for issuance under the 2007 Stock Incentive Plan, shares 19,000 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     327    
Total value of shares withheld sufficient to fund minimum tax withholding requirements related to exercising of stock options and vesting of RSUs     $ 29    
RSUs/PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total unrecognized compensation cost $ 206 $ 206 206    
Weighted average period for cost to be recognized 3 years        
Tax benefit realized related to exercise of options   2 24    
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total unrecognized compensation cost $ 172 172 172    
Weighted average period for cost to be recognized 3 years        
Aggregate intrinsic value of options exercised     157 $ 81  
Cash receipts due to exercise of options     128 $ 52  
Tax benefit realized related to exercise of options   $ 32 $ 50