Benefit Plans and Other Postretirement Benefits, Expected long-term rate of return (Details) - U.S. plans, Pension Benefits	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure
Number of years of compounded return	20 years
Historical compounded return on plan assets (as a percent)	8.50%
Expected long-term return on assets (as a percent)	7.75%	8.00%	8.00%
Equity securities
Defined Benefit Plan Disclosure
Plan asset allocation assumption (as a percent)	60%
Expected long-term return on assets, assumptions (as a percent)	8.50%
Fixed income securities
Defined Benefit Plan Disclosure
Plan asset allocation assumption (as a percent)	40%
Expected long-term return on assets (as a percent)	6.00%