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Benefit Plans - Additional Information (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 11, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2018 arrangement
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pension plans resulted in net pension liability |  |  | $ 709,000,000 | $ 1,114,000,000 |  |
Plan assets related to certain insurance contracts |  |  | 67,000,000 | 67,000,000 |  |
Expense for defined contribution plans |  |  | 72,000,000 | 57,000,000 | $ 43,000,000 |
Multiemployer Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Multiemployer pension plans contributions |  |  | $ 5,000,000 | 17,000,000 | 26,000,000 |
Multiemployer Pension Plans | Bakery and Confectionery Union and Industry International Pension Fund |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Multiemployer pension plans contributions |  |  |  | 12,000,000 | 22,000,000 |
Multiemployer Pension Plans | Bakery and Confectionery Union and Industry International Pension Fund |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pension fund |  |  | Bakery and Confectionery Union and Industry International Pension Fund |  |  |
Multiemployer Pension Plans | Multiemployer Plan, Individually Insignificant Multiemployer Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Multiemployer pension plans contributions |  |  | $ 5,000,000 | 5,000,000 | 4,000,000 |
Multiemployer Plans, Postretirement Benefit | Multiemployer Medical Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Multiemployer pension plans contributions |  |  | $ 20,000,000 | 19,000,000 | $ 18,000,000 |
U.S. And International Investment Grade Debt Securities | Fixed-income 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 | Bakery, Confectionery, Tobacco and Grain Millers Union (“BCTGM”) | Multiemployer Pension Plans | Bakery and Confectionery Union and Industry International Pension Fund |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Multiemployer plan, number of expired collective-bargaining arrangements | arrangement |  |  |  |  |  | 8
U.S. Plans | North America | Bakery, Confectionery, Tobacco and Grain Millers Union (“BCTGM”) | Multiemployer Pension Plans | Bakery and Confectionery Union and Industry International Pension Fund |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Multiemployer plan, withdrawal obligation | $ 526,000,000 |  | $ 391,000,000 | 429,000,000 |  |
Multiemployer plan, withdrawal obligation term | 20 years |  |  |  |  |
U.S. Plans | Selling, general and administrative expenses | North America | Bakery, Confectionery, Tobacco and Grain Millers Union (“BCTGM”) | Multiemployer Pension Plans | Bakery and Confectionery Union and Industry International Pension Fund |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Multiemployer plan, final adjustment to reduce withdrawal liability |  | $ 35,000,000 |  |  |  |
U.S. Plans | Other current liabilities | North America | Bakery, Confectionery, Tobacco and Grain Millers Union (“BCTGM”) | Multiemployer Pension Plans | Bakery and Confectionery Union and Industry International Pension Fund |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Multiemployer plan, withdrawal obligation |  |  | 14,000,000 |  |  |
U.S. Plans | Other liabilities | North America | Bakery, Confectionery, Tobacco and Grain Millers Union (“BCTGM”) | Multiemployer Pension Plans | Bakery and Confectionery Union and Industry International Pension Fund |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Multiemployer plan, withdrawal obligation |  |  | 377,000,000 |  |  |
Pension Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Pension plans resulted in net pension liability |  |  | 709,000,000 | 1,114,000,000 |  |
Estimated loss from experience differences |  |  | 133,000,000 |  |  |
Estimated prior service credit |  |  | 6,000,000 |  |  |
Pension Plans | U.S. Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Accumulated benefit obligation |  |  | 1,741,000,000 | $ 1,488,000,000 |  |
Employer contribution |  |  | 8,000,000 |  |  |
Estimated future employer contributions |  |  | $ 16,000,000 |  |  |
Weighted-average discount rate |  |  | 3.44% | 4.40% |  |
Rate of compensation increase |  |  | 4.00% | 4.00% |  |
Pension Plans | Non-U.S. Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Accumulated benefit obligation |  |  | $ 10,236,000,000 | $ 9,374,000,000 |  |
Employer contribution |  |  | 248,000,000 |  |  |
Employees contribution |  |  | 13,000,000 |  |  |
Estimated future employer contributions |  |  | $ 230,000,000 |  |  |
Weighted-average discount rate |  |  | 1.74% | 2.45% |  |
Rate of compensation increase |  |  | 3.17% | 3.31% |  |
Pension Plans | Non-U.S. Plans | Fixed-income securities |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation percentage |  |  | 57.00% |  |  |
Pension Plans | Non-U.S. Plans | Equity securities |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation percentage |  |  | 25.00% |  |  |
Pension Plans | Non-U.S. Plans | Buy-in annuity policies |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation percentage |  |  | 12.00% |  |  |
Pension Plans | Non-U.S. Plans | Real estate |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation percentage |  |  | 6.00% |  |  |
Postretirement Benefit Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Current portion of our accrued postretirement benefit obligation |  |  | $ 16,000,000 | $ 15,000,000 |  |
Postretirement Benefit Plans | U.S. Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Weighted-average discount rate |  |  | 3.41% | 4.37% |  |
Postretirement Benefit Plans | Non-U.S. Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Weighted-average discount rate |  |  | 3.86% | 4.40% |  |
Postretirement Health Care Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Estimated loss from experience differences |  |  | $ 10,000,000 |  |  |
Estimated prior service credit |  |  | $ 30,000,000 |  |  |
Postemployment Benefit Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Weighted-average discount rate |  |  | 5.30% | 6.70% |  |
Ultimate annual turnover rate |  |  | 0.30% | 0.30% |  |
Rate of compensation increase |  |  | 4.00% | 4.00% |  |
Defined benefit plan, amount to be amortized from accumulated other comprehensive income (loss) next fiscal year |  |  | $ 4,000,000 |  |  |

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