Postretirement Benefit Plans (Discount Rates) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Periodic Benefit Cost Assumptions
Expected long-term rate of return on plan assets	7.32%	7.38%	7.38%
United States
Benefit Obligation Assumptions
Discount rate	4.25%	4.27%	4.01%
Net Periodic Benefit Cost Assumptions
Discount rate	4.27%	4.01%	4.79%
Expected long-term rate of return on plan assets	8.00%	8.00%	8.00%
International
Benefit Obligation Assumptions
Discount rate	2.63%	3.44%	3.14%
Rate of future compensation increase	2.76%	3.29%	3.34%
Net Periodic Benefit Cost Assumptions
Discount rate	3.44%	3.14%	4.23%
Expected long-term rate of return on plan assets	7.25%	7.31%	7.30%
Rate of future compensation increase	3.29%	3.34%	3.48%