Employee Benefits (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Maximum annual increase percentage to company contribution for retiree medical coverage	4.00%
Defined benefit plan, estimated future employer contributions in next fiscal year beginning after the date of the latest statement of financial position	$ 450
Defined benefit plan, contributions by employer to employee pension plan	170
Contribution to other post retirement plans	35
Defined benefit plan, expected contributions during the remaining of fiscal year	128
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, estimated future employer contributions in next fiscal year beginning after the date of the latest statement of financial position	200
Defined benefit plan, contributions by employer to employee pension plan	95
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, estimated future employer contributions in next fiscal year beginning after the date of the latest statement of financial position	$ 250