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Defined Benefit Plan, Net Periodic Benefit Cost, Period For Recognition

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Multiemployer Plans, Withdrawal Obligation, Period Charge

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Multiemployer Plans, Withdrawal Obligation, Period Charge, Net Of Tax

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Ultimate Annual Turnover Rate

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as current. Excludes other postretirement benefit plan.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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Amount of contributions received by defined benefit plan from participant which increases plan assets.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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Amount of cost for defined contribution plan.

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Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

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Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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Benefit Plans - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
Benefit Plans - Narrative (Details) - USD ($) $ in Millions	Jul. 11, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Pension plans resulted in net pension liability			$ 614	$ 709
Plan assets related to certain insurance contracts			129	67
Expense for defined contribution plans			$ 83	72	$ 57
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]
Multiemployer plan, withdrawal obligation	$ 526		$ 375		429
Multiemployer plan, withdrawal obligation term	20 years
Multiemployer plan, adjustment related to withdrawal liability		$ 35
Multiemployer plan, adjustment related to withdrawal liability, net of tax		$ 26
Multiemployer plan, accreted interest on withdrawal liability			11	12	6
U.S. Plans \| North America \| Bakery and Confectionery Union and Industry International Pension Fund \| Other current liabilities
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, withdrawal obligation			14
U.S. Plans \| North America \| Bakery and Confectionery Union and Industry International Pension Fund \| Other long-term liabilities
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, withdrawal obligation			361
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Pension plans resulted in net pension liability			614	709
Multiemployer plan contributions			5	5	17
Pension Plans \| U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation			1,882	$ 1,741
Employer contribution			13
Estimated employer contributions during in 2021			$ 8
Weighted-average discount rate			2.73%	3.44%
Rate of compensation increase			4.00%	4.00%
Pension Plans \| Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation			$ 11,404	$ 10,236
Employer contribution			194
Employees contribution			14
Estimated employer contributions during in 2021			$ 228
Weighted-average discount rate			1.33%	1.74%
Rate of compensation increase			3.16%	3.17%
Pension Plans \| Non-U.S. Plans \| Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage			60.00%
Pension Plans \| Non-U.S. Plans \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage			23.00%
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			5.00%
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Current portion of our accrued postretirement benefit obligation			$ 16	$ 16
Postretirement Benefit Plans \| Multiemployer Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan contributions			$ 20	$ 20	$ 19
Postretirement Benefit Plans \| U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate			2.68%	3.41%
Postretirement Benefit Plans \| Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate			3.35%	3.86%
Postemployment Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate			4.30%	5.30%
Ultimate annual turnover rate			0.30%	0.30%
Rate of compensation increase			4.00%	4.00%
Net gains for post-employment benefit plans expected to be amortized from other comprehensive earnings/(losses) into cost during 2021			$ (3)