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Quarterly Financial Data Net income and earnings per share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 28, 2019
Sep. 28, 2019
Jun. 29, 2019
Mar. 30, 2019
Dec. 29, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Net income (loss) attributable to Kellogg Company, Basic $ 145 $ 247 $ 286 $ 282 $ (84) [1] $ 380 $ 596 $ 444 $ 960 $ 1,336 $ 1,254
Basic $ 0.43 $ 0.73 $ 0.84 $ 0.82 $ (0.24) $ 1.10 $ 1.72 $ 1.28 $ 2.81 $ 3.85 $ 3.61
Diluted $ 0.42 $ 0.72 $ 0.84 $ 0.82 $ (0.24) $ 1.09 $ 1.71 $ 1.27 $ 2.80 $ 3.83 $ 3.58
[1]
The significant decrease in the fourth quarter 2018 net income is primarily due to a mark-to-market adjustment recognized on pension assets.