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Employee Benefit Plans (Details) - Pension Benefits | 3 Months Ended | 6 Months Ended
--- | --- | ---
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 |

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