Employee Benefits (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 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	$ 700
Defined benefit plan, contributions by employer to employee pension plan	89
Contribution to other post retirement plans	52
Defined benefit plan, expected contributions in current fiscal year	163
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	50
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