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Goodwill and Intangible Assets Changes in the Carrying Amount of Goodwill by Segment (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 29, 2018
Jul. 01, 2017
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Goodwill [Roll Forward]          
Beginning balance     $ 36,503    
Impairment losses $ (6,900)   (1,197) $ (7,008) $ 0
Acquisitions     130    
Translation adjustments and other     110    
Ending balance 36,503   35,546 36,503  
United States          
Goodwill [Roll Forward]          
Beginning balance     29,597    
Impairment losses     (118)    
Acquisitions     124    
Translation adjustments and other     (2)    
Ending balance 29,597   29,601 29,597  
International          
Goodwill [Roll Forward]          
Beginning balance     4,468    
Impairment losses   $ (49) (1,079)    
Acquisitions     6    
Translation adjustments and other     6    
Ending balance 4,468   3,401 4,468  
Canada          
Goodwill [Roll Forward]          
Beginning balance     2,438    
Impairment losses     0    
Acquisitions     0    
Translation adjustments and other     106    
Ending balance $ 2,438   $ 2,544 $ 2,438