Benefit Obligations (Valuation Narrative) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.80%	8.20%	8.00%
United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual return on plan assets	(2.50%)
Expected return on plan assets	8.00%	8.50%	8.50%
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year	10.00%	7.00%	7.50%
Health care cost trend ultimate rate	5.00%	5.00%	5.00%