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Threshold for determining whether a multiemployer plan member is a significant member of the plan.

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Multiemployer Plans, Partial Withdrawal Obligation

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Multiemployer Plans, Surcharge Imposed

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Multiemployer Plans, Withdrawal Obligation, Accreted Interest

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

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Multiemployer Plans, Withdrawal Obligation Term

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Ultimate Annual Turnover Rate

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- Definition

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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- Definition

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

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- Definition

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 included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan 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 included in accumulated other comprehensive (income) loss for prior service cost (credit) 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 benefits for defined benefit plan expected to be paid in remainder of fiscal year.

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

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- Definition

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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Percentage of actual 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 contributions made to multiemployer plan by employer.

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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 - Additional Information (Details)		3 Months Ended				12 Months Ended
Benefit Plans - Additional Information (Details)	Aug. 28, 2016	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($) arrangement	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Pension plans resulted in net pension liability		$ (1,114,000,000)				$ (1,114,000,000)	$ (1,570,000,000)
Plan assets related to certain insurance contracts		67,000,000				67,000,000	71,000,000
Impact from pension participation changes		$ 17,000,000	$ 3,000,000	$ 409,000,000	$ 0
Expense for defined contribution plans						57,000,000	43,000,000	$ 44,000,000
Multiemployer Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Multiemployer pension plans contributions						17,000,000	$ 26,000,000	$ 25,000,000
Multiemployer Pension Plans \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Company's contribution of the total contribution of each plan							5.00%	5.00%
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	$ 21,000,000
Multiemployer plan, surcharge percentage imposed	10.00%
Multiemployer Pension Plans \| Multiemployer Plan, Individually Insignificant Multiemployer Plans
Defined Benefit Plan Disclosure [Line Items]
Multiemployer pension plans contributions						5,000,000	4,000,000	4,000,000
Multiemployer Plans, Postretirement Benefit \| Multiemployer Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Multiemployer pension plans contributions						$ 19,000,000	18,000,000	$ 19,000,000
U.S. And International Investment Grade Debt Securities \| Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage		95.00%				95.00%
U.S. Plans \| Bakery, Confectionery, Tobacco and Grain Millers Union (“BCTGM”) \| Multiemployer Pension Plans \| Bakery and Confectionery Union and Industry International Pension Fund [Member]
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 [Member]
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, partial withdrawal liability		$ 573,000,000				$ 573,000,000
Multiemployer plan, withdrawal obligation term			20 years
Multiemployer plan, withdrawal obligation		423,000,000				423,000,000
Impact from pension participation changes						316,000,000
Multiemployer plans, accreted interest on the long-term liability						6,000,000
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Pension plans resulted in net pension liability		(1,114,000,000)				(1,114,000,000)	(1,570,000,000)
Estimated from experience differences		168,000,000				168,000,000
Pension Plans \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Estimated prior service cost		6,000,000				6,000,000
Pension Plans \| Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		$ 9,374,000,000				$ 9,374,000,000	$ 10,610,000,000
Allocation of pension plan asset percentage		100.00%				100.00%	100.00%
Employer contribution						$ 310,000,000
Employees contribution						13,000,000
Estimated future employer contributions		$ 232,000,000				$ 232,000,000
Weighted-average discount rate		2.45%				2.45%	2.20%
Rate of compensation increase		3.31%				3.31%	3.31%
Pension Plans \| Non-U.S. Plans \| Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage		67.00%				67.00%
Allocation of pension plan asset percentage		65.00%				65.00%	60.00%
Pension Plans \| Non-U.S. Plans \| Other Plan Asset
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage		2.00%				2.00%
Pension Plans \| Non-U.S. Plans \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage		31.00%				31.00%
Allocation of pension plan asset percentage		26.00%				26.00%	28.00%
Pension Plans \| Non-U.S. Plans \| Non US Pension Assets
Defined Benefit Plan Disclosure [Line Items]
Allocation of pension plan asset percentage		63.00%				63.00%
Pension Plans \| Non-U.S. Plans \| Non US Pension Assets \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage		23.00%				23.00%
Pension Plans \| Non-U.S. Plans \| Non US Pension Assets \| Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage		20.00%				20.00%
Pension Plans \| Non-U.S. Plans \| Non US Pension Assets \| Liability Matching Assets
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage		57.00%				57.00%
Pension Plans \| U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		$ 1,488,000,000				$ 1,488,000,000	$ 1,715,000,000
Allocation of pension plan asset percentage		100.00%				100.00%	100.00%
Employer contribution						$ 39,000,000
Estimated future employer contributions		$ 5,000,000				$ 5,000,000
Weighted-average discount rate		4.40%				4.40%	3.68%
Rate of compensation increase		4.00%				4.00%	4.00%
Pension Plans \| U.S. Plans \| Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Allocation of pension plan asset percentage		85.00%				85.00%	85.00%
Pension Plans \| U.S. Plans \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Allocation of pension plan asset percentage		15.00%				15.00%	15.00%
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Current portion of our accrued postretirement benefit obligation		$ 15,000,000				$ 15,000,000	$ 16,000,000
Postretirement Benefit Plans \| Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate		4.40%				4.40%	4.24%
Postretirement Benefit Plans \| U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate		4.37%				4.37%	3.66%
Postretirement Health Care Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated from experience differences		$ 7,000,000				$ 7,000,000
Estimated prior service cost		$ 39,000,000				$ 39,000,000
Postemployment Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate		6.70%				6.70%	6.50%
Ultimate annual turnover rate							0.30%
Rate of compensation increase							4.00%
Defined benefit plan, amount to be amortized from accumulated other comprehensive income (loss) next fiscal year		$ 3,000,000				$ 3,000,000