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v3.23.3

Notes payable and long-term debt - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 01, 2023 | Sep. 30, 2023 | Apr. 01, 2023 | Oct. 01, 2022 | Sep. 30, 2023 | Oct. 01, 2022 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notional amount of derivative |  | $ 7,378 |  |  | $ 7,378 |  | $ 7,372
Unrealized gain (loss) on cash flow hedges, pre-tax |  | 40 |  | $ 62 | 37 | $ 213 |
Notes Payable, Current |  | 353 |  |  | 353 |  | 467
Repayments of Long-term Debt |  |  |  |  | 227 | 33 |
Long-term debt |  | 5,530 |  |  | 5,530 |  | 5,317
Interest Expense, Debt |  | 83 |  | 39 | 245 | 149 |
Current maturities of long-term debt |  | 1,193 |  |  | $ 1,193 |  | $ 780
WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Borrowing Capacity, Description |  |  |  |  | Under the Credit Facility, WK Kellogg Co has the right at any time, subject to customary conditions, to request incremental term loans or an increase to the revolving credit facility in an aggregate principal amount of (i) up to the greater of (x) $250 million and (y) 100% of Consolidated EBITDA, as defined in the Credit Agreement, for the preceding four fiscal quarters of WK Kellogg Co. Any such addition of or increase in loans will be subject to certain customary conditions precedent and other provisions. |  |
Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-Term Line of Credit |  | 164 |  |  | $ 164 |  |
Debt Issuance Costs, Gross |  | 7 |  |  | 7 |  |
Current maturities of long-term debt |  | 9 |  |  | 9 |  |
Cash Flow Hedging | Interest expense |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unrealized gain (loss) on cash flow hedges, pre-tax |  | $ 14 |  | $ 83 | $ 85 | $ 165 |
Debt Instrument, Redemption, Period One |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 2.50% |  |  |  |  |
Debt Instrument, Redemption, Period Two | Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 5.00% |  |  |  |  |
Debt Instrument, Redemption, Period Three | Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 5.00% |  |  |  |  |
Debt Instrument, Redemption, Period Four | Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 7.50% |  |  |  |  |
Debt Instrument, Redemption, Period Five | Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  | 10.00% |  |  |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.75% |  |  | 1.75% |  |
Base Rate | Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 0.75% |  |  | 0.75% |  |
5.25% 10-year U.S. Dollar Notes Due 2033 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 400 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  |  |  |  |  |
Net proceeds after discount and underwriting commissions | $ 396 |  |  |  |  |  |
Notional amount of derivative | $ 400 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.06% |  |  |  |  |  |
5.25% 10-year U.S. Dollar Notes Due 2033 | Cash Flow Hedging | Interest expense |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unrealized gain (loss) on cash flow hedges, pre-tax |  |  | $ 47 |  |  |  |
Cumulative unrealized gain (loss) on cash flow hedge settlement, pre-tax |  |  | $ 91 |  |  |  |
2.75% 10-year U.S. Dollar Notes Due 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 210 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.75% |  |  |  |  |  |
U.S. commercial paper |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 5.44% |  |  | 5.44% |  | 4.46%
Notes Payable, Current |  | $ 0 |  |  | $ 0 |  | $ 330
Bank borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes Payable, Current |  | 353 |  |  | 353 |  | $ 137
Other assets | Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  | 2 |  |  | 2 |  |
Loans | Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  | 5 |  |  | 5 |  |
Revolving Credit Facility | Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-Term Line of Credit |  | 350 |  |  | 350 |  |
Term Loan | Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 500 |  |  | 500 |  |
Delayed Draw Term Loan [Member] | Line of Credit | WK Kellogg Co |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 250 |  |  | 250 |  |
Long-term debt |  | $ 250 |  |  | $ 250 |  |
Credit Agreement as a percentage of EBITDA |  | 100.00% |  |  | 100.00% |  |

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