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- Definition

Multiemployer Plans, Partial Withdrawal Obligation

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- Definition

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

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- Definition

Multiemployer Plans, Withdrawal Obligation Term

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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 benefits for defined benefit plan expected to be paid in remainder of fiscal year.

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- Definition

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) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 arrangement
U.S. Plans \| Multiemployer Plans, Pension \| Fund \| BCTGM
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, number of expired collective-bargaining arrangements \| arrangement				8
U.S. Plans \| Multiemployer Plans, Pension \| Fund \| BCTGM \| North America
Defined Benefit Plan Disclosure [Line Items]
Multiemployer plan, partial withdrawal liability		$ 573	$ 573
Multiemployer plan, withdrawal obligation term		20 years
Multiemployer plan, withdrawal obligation		$ 429	429
Multiemployer plan, withdrawal obligation, net of tax			$ 321
Pension Plans \| U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 1
Estimated future employer contributions	4
Pension Plans \| Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	68
Estimated future employer contributions	164
Pension Plans \| Non-U.S. Plans \| United Kingdom and Ireland
Defined Benefit Plan Disclosure [Line Items]
Employer contribution	$ 38