Employee Benefits (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
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		$ 700
Defined benefit plan, contributions by employer to employee pension plan	159
Defined benefit plan, estimated future employer contributions in current fiscal year	450
Contribution to other post retirement plans	103
Defined benefit plan, expected contributions in current fiscal year	112
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	63
Defined benefit plan, estimated future employer contributions in current fiscal year	100
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		350
Defined benefit plan, estimated future employer contributions in current fiscal year	$ 350