Employee Retirement Plans (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)
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	2
Pension
Defined Benefit Plan Disclosure [Line Items]
Estimated total contributions in current year	$ 61