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Divestiures, West Africa Investments and Acquisitions Multipro Schedule of Pro Forma Results (Details) - Multipro - USD ($)
$ in Millions
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Business Acquisition [Line Items]    
Pro forma net sales $ 13,829 $ 13,511
Pro forma net income attributable to Kellogg Company $ 1,336 $ 1,255