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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 28, 2019
Dec. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for awards 18.0    
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 Repurchase Program, Authorized Amount $ 3,700    
Stock Repurchase Program, Remaining Authorized Repurchase Amount 927    
Dividends Payable $ 69 $ 56  
Treasury Stock, Shares, Acquired 10.6 18.8 11.2
Treasury stock purchases $ 757 $ 1,300 $ 644
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 49    
Period of recognition for remaining share-based compensation expense 1 year 11 months 4 days    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized compensation cost $ 193    
Period of recognition for remaining share-based compensation expense 1 year 9 months 14 days    
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Typical vesting period for option awards 4 years    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Typical vesting period for option awards 5 years