Pension and Other Postretirement Benefit Plans - Summary of Weighted Average Assumptions Used in Determining Pension Plan and U.S. Pension and Other Postretirement Benefit Plan Information (Details)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
United States
Net periodic benefit cost
Discount rate	4.30%	4.70%	4.20%
Expected rate of return on plan assets	8.70%	8.60%	8.50%
Salary growth rate	4.30%	4.30%	4.40%
Benefit obligation
Discount rate	3.70%	4.30%	4.80%
Salary growth rate	4.30%	4.30%	4.30%
International \| Pension Plan
Net periodic benefit cost
Discount rate	2.20%	2.80%	2.70%
Expected rate of return on plan assets	5.10%	5.60%	5.70%
Salary growth rate	2.90%	2.90%	2.90%
Benefit obligation
Discount rate	2.10%	2.20%	2.80%
Salary growth rate	2.90%	2.90%	2.90%

Pension and Other Postretirement Benefit Plans - Summary of Weighted Average Assumptions Used in Determining Pension Plan and U.S. Pension and Other Postretirement Benefit Plan Information (Details)

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

United States

Net periodic benefit cost

Discount rate

4.30%

4.70%

4.20%

Expected rate of return on plan assets

8.70%