Pension and Postretirement Benefit Plans (Components of net periodic benefit cost and other information) (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Amounts recognized in the Consolidated Balance Sheet
Non-current assets	$ 54		$ 54		$ 46
Accrued benefit cost
Non-current liabilities	(3,683)		(3,683)		$ (3,843)
Qualified and Non-qualified Pension Benefits
Change in plan assets
Company contributions			183
United States Qualified and Non-qualified Pension Benefits
Change in benefit obligation
Service cost	73	$ 60	146	$ 120
Interest cost	164	169	328	338
International Qualified and Non-qualified Pension Benefits
Change in benefit obligation
Service cost	40	35	82	71
Interest cost	55	65	110	129
Postretirement Benefits
Change in benefit obligation
Service cost	22	17	43	33
Interest cost	$ 25	$ 24	50	$ 48
Change in plan assets
Company contributions			$ 2