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Benefit Plans - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 11, 2019 USD ($) | Sep. 30, 2024 company | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of insurance companies | company |  | 2 |  |  |
Plan assets related to certain insurance contracts |  |  | $ 96 | $ 97 |
Expense for defined contribution plans |  |  | $ 68 | 66 | $ 66
Fixed-income securities | U.S. and International Investment Grade Debt Securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation percentage |  |  | 95.00% |  |
U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Period for recognition of net periodic benefit costs |  |  | 4 years |  |
U.S. Plans | North America | Bakery and Confectionery Union and Industry International Pension Fund |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Undiscounted withdrawal liability | $ 491 |  | $ 311 |  |
Withdrawal liability payment term | 20 years |  |  |  |
Accreted interest |  |  | 10 | 10 | 11
U.S. Plans | North America | Bakery and Confectionery Union and Industry International Pension Fund | Other current liabilities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Undiscounted withdrawal liability |  |  | 16 |  |
U.S. Plans | North America | Bakery and Confectionery Union and Industry International Pension Fund | Other liabilities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Undiscounted withdrawal liability |  |  | 295 |  |
Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net pension asset |  |  | 561 | 574 |
Pension Plans | U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation |  |  | 1,200 |  |
Employer contributions |  |  | 4 |  |
Estimated future employer contributions during in 2024 |  |  | 11 |  |
Net periodic postretirement (benefit)/cost |  |  | $ (11) | $ (14) | (2)
Weighted-average discount rate |  |  | 5.18% | 5.22% |
Rate of compensation cost increases |  |  | 4.00% | 4.00% |
Pension Plans | Non-U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation |  |  | $ 6,600 | $ 7,300 |
Employer contributions |  |  | 86 |  |
Employee contributions |  |  | 23 |  |
Estimated future employer contributions during in 2024 |  |  | 68 |  |
Net periodic postretirement (benefit)/cost |  |  | $ (22) | $ (4) | (28)
Weighted-average discount rate |  |  | 4.45% | 4.03% |
Rate of compensation cost increases |  |  | 3.10% | 3.22% |
Pension Plans | Non-U.S. Plans | Fixed-income securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation percentage |  |  | 56.00% |  |
Pension Plans | Non-U.S. Plans | Equity securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation percentage |  |  | 13.00% |  |
Pension Plans | Non-U.S. Plans | Buy-in annuity contracts |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation percentage |  |  | 27.00% |  |
Pension Plans | Non-U.S. Plans | Real estate |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation percentage |  |  | 4.00% |  |
Postretirement Benefit Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Current portion of accrued postretirement benefit obligation |  |  | $ 11 | $ 11 |
Postretirement Benefit Plans | Multiemployer Medical Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multiemployer medical plan contributions |  |  | 17 | 18 | 17
Postretirement Benefit Plans | U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  |  | $ 14 | $ 76 |
Weighted-average discount rate |  |  | 5.70% | 5.20% |
Postretirement Benefit Plans | Non-U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted-average discount rate |  |  | 5.77% | 5.72% |
Postemployment Benefit Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic postretirement (benefit)/cost |  |  | $ 20 | $ 4 | 0
Weighted-average discount rate |  |  | 9.10% | 8.10% |
Weighted-average ultimate annual turnover rate |  |  | 0.80% |  |
Rate of compensation cost increases |  |  | 4.00% |  |
Net gain for post-employment benefit plans expected to be amortized from AOCI into net periodic postemployment costs during 2024 |  |  | $ 4 |  |
Postretirement Health Care Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net periodic postretirement (benefit)/cost |  |  | $ (11) | $ (5) | $ 12

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