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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for awards 17.4      
Typical vesting period for option awards 5 years      
Contractual term of options 10 years      
Associate stock purchase plan discount 15.00%      
Authorized preferred shares 1.0      
Par value per share of preferred stock $ 0.01      
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost $ 150      
Period of recognition for remaining share-based compensation expense 3 years 2 months 4 days      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized compensation cost $ 8      
Period of recognition for remaining share-based compensation expense 1 year 9 months 25 days      
2016 Repurchase Program A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Repurchase Program, Authorized Amount $ 300      
2016 Repurchase Program B [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Repurchase Program, Authorized Amount 500      
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 100      
2016 Repurchase Programs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Repurchased During Period, Shares 13.7      
Payments for Repurchase of Common Stock, Excluding Transaction Costs 700      
2015 Repurchase Program [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Repurchase Program, Authorized Amount   $ 245    
Stock Repurchased During Period, Shares   4.1    
Payments for Repurchase of Common Stock, Excluding Transaction Costs   245    
2013 Repurchase Program [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock Repurchase Program, Authorized Amount     $ 317  
Stock Repurchased During Period, Shares   1.6 4.1  
Stock Repurchase Program, Increase in Authorized Amount     $ 100  
Payments for Repurchase of Common Stock, Excluding Transaction Costs   100 217.0  
Stock Repurchase Program, Original Authorized Amount       $ 217