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Benefit Plans - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 11, 2019 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets related to certain insurance contracts |  | $ 97 | $ 117 |
Expense for defined contribution plans |  | $ 66 | 66 | $ 73
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 | $ 328 |  |
Withdrawal liability payment term | 20 years |  |  |
Accreted interest |  | 10 | 11 | 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 |  | 15 |  |
U.S. Plans | North America | Bakery and Confectionery Union and Industry International Pension Fund | Other long-term liabilities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Undiscounted withdrawal liability |  | 313 |  |
Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net pension asset |  | 574 | 583 |
Pension Plans | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  | 1,200 | 1,200 |
Employer contributions |  | 6 |  |
Estimated future employer contributions during in 2024 |  | 4 |  |
Net periodic postretirement (benefit)/cost |  | $ (14) | $ (2) | 13
Weighted-average discount rate |  | 5.22% | 5.55% |
Rate of compensation cost increases |  | 4.00% | 4.00% |
Pension Plans | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  | $ 7,300 | $ 6,800 |
Employer contributions |  | 141 |  |
Employee contributions |  | 21 |  |
Estimated future employer contributions during in 2024 |  | 128 |  |
Net periodic postretirement (benefit)/cost |  | $ (4) | $ (28) | (42)
Weighted-average discount rate |  | 4.03% | 4.51% |
Rate of compensation cost increases |  | 3.22% | 3.22% |
Pension Plans | Non-U.S. Plans | Fixed-income securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation percentage |  | 53.00% |  |
Pension Plans | Non-U.S. Plans | Equity securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation percentage |  | 14.00% |  |
Pension Plans | Non-U.S. Plans | Buy-in annuity policies |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation percentage |  | 29.00% |  |
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 | $ 16 |
Postretirement Benefit Plans | Multiemployer Medical Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer medical plan contributions |  | 18 | 17 | 19
Postretirement Benefit Plans | U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Employer contributions |  | $ 76 | $ 0 |
Weighted-average discount rate |  | 5.20% | 5.53% |
Postretirement Benefit Plans | Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Weighted-average discount rate |  | 5.72% | 6.07% |
Postemployment Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic postretirement (benefit)/cost |  | $ 4 | $ 0 | 5
Weighted-average discount rate |  | 8.10% | 6.30% |
Weighted-average ultimate annual turnover rate |  | 0.80% | 0.40% |
Rate of compensation cost increases |  | 4.00% | 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 |  | $ (5) | $ 12 | $ 14

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