Employee Benefits (Details Textual) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
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		$ 600
Defined benefit plan, contributions by employer to employee pension plan	$ 719
Defined benefit plan, estimated future employer contributions in current fiscal year	850
Contribution to other post retirement plans	148
Defined benefit plan, expected contributions during the remaining of fiscal year	50
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		350
Defined benefit plan, contributions by employer to employee pension plan	600
Defined benefit plan, estimated future employer contributions in current fiscal year	600
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
Defined benefit plan, estimated future employer contributions in current fiscal year	$ 250