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Our Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Capitalized Computer Software, Net $ 572 $ 577  
Capitalized Computer Software, Amortization 166 204 $ 224
Shipping and handling expenses 10,900 10,500 9,900
Research and development costs 711 680 737
Amount of prepaid incentive arrangements 272 218  
Advertising and other marketing activities 4,700 4,200 4,100
Advertising expenses 3,000 2,600 2,400
Deferred advertising costs $ 55 47  
Sales, use, value-added and certain excise taxes assessed by governmental authorities on revenue-producing transactions that were recognized in net revenue and cost of sales     $ 75
Retained Earnings [Member]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ 137