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QUARTERLY FINANCIAL DAT, Net Income and Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 30, 2023
Sep. 30, 2023
Jul. 01, 2023
Apr. 01, 2023
Dec. 31, 2022
Oct. 01, 2022
Jul. 02, 2022
Apr. 02, 2022
Dec. 30, 2023
Dec. 31, 2022
Jan. 01, 2022
Quarterly Financial Information Disclosure [Abstract]                      
Net income from continuing operations $ 58 $ 199 $ 297 $ 234 $ (28) $ 235 $ 201 $ 323 $ 788 $ 731 $ 1,103
Earnings from continuing operations, per basic share $ 0.16 $ 0.58 $ 0.85 $ 0.67 $ (0.08) $ 0.68 $ 0.59 $ 0.95 $ 2.27 $ 2.14 $ 3.21
Earnings from continuing operations, per diluted share 0.16 0.57 0.85 0.67 (0.08) 0.68 0.59 0.94 2.25 2.12 3.19
Earnings from discontinued operations, per basic share (0.08) 0.21 0.19 0.20 (0.21) 0.23 0.37 0.29 0.51 0.67 1.15
Earnings from discontinued operations, per diluted share $ (0.08) $ 0.21 $ 0.18 $ 0.19 $ (0.21) $ 0.22 $ 0.36 $ 0.29 $ 0.51 $ 0.67 $ 1.14
Income (loss) from discontinued operations, net of tax $ (28) $ 72 $ 64 $ 68 $ (72) $ 78 $ 125 $ 100 $ 176 $ 231 $ 392
Net income (loss) attributable to Kellanova $ 27 $ 271 $ 355 $ 298 $ (99) $ 311 $ 327 $ 421 $ 951 $ 960 $ 1,488
Net Earnings Per Common Share - Basic $ 0.08 $ 0.79 $ 1.04 $ 0.87 $ (0.29) $ 0.91 $ 0.96 $ 1.24 $ 2.78 $ 2.81 $ 4.36
Net Earnings Per Common Share - Diluted $ 0.08 $ 0.78 $ 1.03 $ 0.86 $ (0.29) $ 0.90 $ 0.95 $ 1.23 $ 2.76 $ 2.79 $ 4.33