Benefit Obligations (Schedule of Weighted Average Target Asset Allocations) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets	(4.10%)
Expected return on plan assets	6.80%	7.50%	7.50%
Weighted average target asset allocations	100.00%
Domestic Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	80.00%
Domestic Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	10.00%
Domestic Plan [Member] | Equity Securities International To Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	10.00%
Domestic Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	0.00%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	5.90%	5.90%	6.10%
Weighted average target asset allocations	100.00%
Foreign Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	59.00%
Foreign Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	16.00%
Foreign Plan [Member] | Equity Securities International To Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	0.00%
Foreign Plan [Member] | Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average target asset allocations	25.00%