Employee Benefits (Schedule Of Weighted Average Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Domestic Plan [Member] | Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.40%	3.80%	4.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Discount rate for benefit obligations	3.80%	3.20%	3.50%
Discount rate for service cost	4.10%	3.40%	0.00%
Discount rate for interest cost	3.20%	2.90%	0.00%
Expected return on plan assets	6.80%	6.80%	7.00%
Rate of compensation increase		0.00%	0.00%
Domestic Plan [Member] | Other Postretirement Plan Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.00%	3.30%	3.50%
Health care cost trend rate - Initial rate	7.30%	7.30%	0.00%
Health care cost trend rate- Ultimate rate (periodic benefit costs)	4.60%	4.50%	0.00%
Health care cost trend rate- Ultimate rate (benefit obligation)	4.50%	4.50%	0.00%
Health care cost trend rate- Years to ultimate (benefit obligations)	11 years	11 years	0 years
Discount rate for benefit obligations	3.30%	2.60%	3.30%
Discount rate for service cost	3.80%	3.10%	0.00%
Discount rate for interest cost	2.60%	2.80%	0.00%
Health care cost trend rate- Initial rate (periodic benefit costs)	6.80%	7.00%	0.00%
Health care cost trend rate- Years to ultimate (periodic benefit costs)	11 years	12 years	0 years
Foreign Plan [Member] | Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.80%	1.80%	2.40%
Rate of compensation increase	2.60%	2.60%	2.50%
Discount rate for benefit obligations	1.80%	2.40%	1.90%
Discount rate for service cost	1.90%	2.40%	0.00%
Discount rate for interest cost	2.00%	2.40%	0.00%
Expected return on plan assets	3.80%	4.60%	0.00%
Rate of compensation increase	2.60%	2.60%	2.50%
Foreign Plan [Member] | Other Postretirement Plan Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.00%	4.00%
Health care cost trend rate - Initial rate	6.20%	6.20%
Health care cost trend rate- Ultimate rate (periodic benefit costs)	4.50%	4.50%
Health care cost trend rate- Ultimate rate (benefit obligation)	4.50%	4.50%
Health care cost trend rate- Years to ultimate (benefit obligations)	12 years	12 years
Discount rate for benefit obligations	3.30%	3.30%
Discount rate for service cost	3.30%	3.30%
Discount rate for interest cost	3.30%	3.30%
Health care cost trend rate- Initial rate (periodic benefit costs)	6.80%	6.80%
Health care cost trend rate- Years to ultimate (periodic benefit costs)	12 years	13 years