Employee Benefit Plans Weighted Average Asset Allocation by Pension Plan (Details)		Dec. 31, 2017	Dec. 31, 2016
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
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 Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		30.00%	27.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		33.00%
Foreign Plan [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		46.00%	48.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		45.00%
Foreign Plan [Member] | Balanced Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	[1]	24.00%	24.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	[1]	22.00%
Foreign Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		0.00%	1.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0.00%
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		100.00%	100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		100.00%
Domestic Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		63.00%	59.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		60.00%
Domestic Plan [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		36.00%	38.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		36.00%
Domestic Plan [Member] | Balanced Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	[1]	0.00%	0.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	[1]	0.00%
Domestic Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		1.00%	3.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		4.00%

[1] Diversified growth funds invest in a broad range of asset classes including equities, investment grade and high yield bonds, commodities, property, private equity, infrastructure and currencies.