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Employee Benefit Plans (Details) - Pension Benefits	3 Months Ended		6 Months Ended
Employee Benefit Plans (Details) - Pension Benefits	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) plan	Jun. 30, 2017 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer plan, contributions by employer \| $	$ 43,000,000	$ 45,000,000	$ 80,000,000	$ 71,000,000
Pension assets or obligations, threshold, per plan \| $	$ 20,000,000		$ 20,000,000
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of plans \| plan			7
Non-U.S. Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Number of plans \| plan			6