Pension and Other Post-Retirement Benefits - Assumptions (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plans, Certified Zone Status [Fixed List]	Green
Retiree Health and Life [Member] | Salaried Health [Member]
Expected long term return on assets and to measure the periodic cost
Discount rate, net periodic cost (benefit)		3.67%
Retiree Health and Life [Member] | Hourly Health [Member]
Expected long term return on assets and to measure the periodic cost
Discount rate, net periodic cost (benefit)		4.00%
Retiree Health and Life [Member] | Salaried and Hourly Health [Member] [Member]
Expected long term return on assets and to measure the periodic cost
Discount rate, benefit obligation	4.06%	3.40%
Retiree Health and Life [Member] | Salaried Life Insurance [Member]
Expected long term return on assets and to measure the periodic cost
Discount rate, net periodic cost (benefit)		4.19%
Retiree Health and Life [Member] | Hourly Life Insurance [Member]
Expected long term return on assets and to measure the periodic cost
Discount rate, net periodic cost (benefit)		3.84%
Retiree Health and Life [Member] | Salaried and Hourly Life Insurance [Member] [Member]
Expected long term return on assets and to measure the periodic cost
Discount rate, benefit obligation	4.32%	3.66%
UNITED STATES | Salaried Funded Plans [Member] [Domain]
Expected long term return on assets and to measure the periodic cost
Discount rate, benefit obligation	4.32%	3.68%
UNITED STATES | Hourly Funded Plans [Member]
Expected long term return on assets and to measure the periodic cost
Discount rate, benefit obligation	4.42%	3.73%
Discount rate, net periodic cost (benefit)	3.74%	4.31%
Expected return on plan assets, net periodic cost (benefit)	5.50%	6.15%
UNITED STATES | Salaried Funded and Unfunded Plans [Member]
Expected long term return on assets and to measure the periodic cost
Rate of compensation and pension-in-payment increases, benefit obligation	3.00%	2.50%
Discount rate, net periodic cost (benefit)	3.68%	4.23%
Expected return on plan assets, net periodic cost (benefit)	5.90%	6.25%
Rate of compensation and pension-in-payment increases, net periodic cost (benefit)	2.50%	2.50%
Foreign Plan [Member]
Expected long term return on assets and to measure the periodic cost
Discount rate, benefit obligation	2.60%	2.40%
Rate of compensation and pension-in-payment increases, benefit obligation	3.20%	3.10%
Discount rate, net periodic cost (benefit)	2.40%	2.60%
Expected return on plan assets, net periodic cost (benefit)	4.10%	4.20%
Rate of compensation and pension-in-payment increases, net periodic cost (benefit)	3.10%	3.20%
Minimum [Member] | UNITED STATES | Salaried Unfunded Plans [Domain]
Expected long term return on assets and to measure the periodic cost
Discount rate, benefit obligation	0.00%	0.00%
Maximum [Member] | UNITED STATES | Salaried Unfunded Plans [Domain]
Expected long term return on assets and to measure the periodic cost
Discount rate, benefit obligation	0.00%	0.00%
Health Care [Member] | Retiree Health and Life [Member] | Salaried and Hourly Health [Member] [Member]
Expected long term return on assets and to measure the periodic cost
Discount rate, net periodic cost (benefit)	3.41%
Postretirement Life Insurance [Member] | Retiree Health and Life [Member] | Salaried and Hourly Health [Member] [Member]
Expected long term return on assets and to measure the periodic cost
Discount rate, net periodic cost (benefit)	3.66%