Pension and Postretirement Expense Level 4 (Details) - Weighted Average Allocations of Plan Assets - Pension Plan [Member]	Dec. 31, 2017	Dec. 31, 2016
UNITED STATES
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%
UNITED STATES | Equity Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	34.00%	32.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	35.00%
UNITED STATES | Debt Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	55.00%	53.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	55.00%
UNITED STATES | Cash and Cash Equivalents [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	11.00%	15.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10.00%
Foreign Plan [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%
Foreign Plan [Member] | Equity Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	22.00%	23.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	22.00%
Foreign Plan [Member] | Debt Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	76.00%	74.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	78.00%
Foreign Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	2.00%	3.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%