Employee Retirement Plans (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Estimated total contributions in current year	$ 65
United States pension plan
Defined Benefit Plan Disclosure [Line Items]
Contribution by employer	50
Canada pension plan
Defined Benefit Plan Disclosure [Line Items]
Contribution by employer	6
Other domestic pension plan
Defined Benefit Plan Disclosure [Line Items]
Contribution by employer	$ 5