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STOCK COMPENSATION - Summary of Share-based Compensation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 28, 2024 | Dec. 30, 2023 | Dec. 31, 2022 | Apr. 01, 2023
Share-Based Payment Arrangement [Abstract] |  |  |  |  |  |  |
Outstanding, beginning of period - shares | [1] | 9 | 10 |  | 15 |  |
Granted - shares |  | 0 | 0 |  | 0 |  |
Exercised - shares |  | (3) | (1) |  | (4) |  |
Forfeitures and expirations |  | 0 | (1) |  | (1) |  |
Awards transferred to WK Kellogg Co. |  |  | (1) |  | 0 |  |
Adjustment for spin-off |  |  | 2 | [2] | 0 |  |
Outstanding, end of period - shares |  | 6 | 9 | [1] | 10 | [1] |
Exerciseable, end of period - shares |  | 6 | 8 |  | 8 |  |
Outstanding, beginning of period - weighted-average exercise price | [1] | $ 58 | $ 65 |  | $ 64 |  |
Granted - weighted-average exercise price |  | 0 | 0 |  | 0 |  |
Exercised - weighted-average exercise price |  | 59 | 59 |  | 61 |  |
Forfeitures and expirations - weighted-average exercise price |  | 0 | 60 |  | 63 |  |
Awards transferred to WK Kellogg Co |  |  | 66 |  | 0 |  |
Outstanding, end of period - weighted-average exercise price |  | 57 | 58 | [1] | 65 | [1] |
Exercisable, end of period - weighted-average exercise price |  | $ 57 | $ 58 |  | $ 67 |  |
Outstanding, end of period - weighted-average remaining contractual term (years) |  | 4 years |  |  |  |  |
Excerciseable, end of period - weighted-average remaining contractual term (years) |  | 4 years |  |  |  |  |
Outstanding, end of period - aggregate intrinsic value |  | $ 130 |  |  |  |  |
Exerciseable, end of period - aggregate intrinsic value |  | 130 |  |  |  |  |
Total intrinsic value of options exercised |  | $ 36 | $ 5 |  | $ 44 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Incremental Expense related to spin-off |  |  | 10 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Incremental Expense related to spin-off |  |  | 10 |  |  |  |
2023 Performance Share Award |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Non-vested, beginning of year - weighted-average grant date fair value |  |  |  |  |  |  | $ 60
WK Kellogg Co |  |  |  |  |  |  |
Share-Based Payment Arrangement [Abstract] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Incremental Expense related to spin-off |  |  | 9 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Incremental Expense related to spin-off |  |  | $ 9 |  |  |  |
[1] | Activities prior to the spin-off remain unadjusted to ensure consistency with historical reporting.
[2] | In connection with the spin-off of WK Kellogg Co, the modification of stock options resulted in incremental expense totaling approximately $10 million, of which $9 million was related to vested awards and was recognized immediately. The remaining expense will be amortized over the vesting period of the award.

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