Information Relating to the Consolidated Statement of Cash Flows (Details 1) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Additional Information Relating to the Consolidated Statement of Cash Flows (Textual) [Abstract]
Reduction for income tax benefits associated with stock options exercised	$ 17	$ 58	$ 79
Share repurchase price	2	$ 5,006	$ 5,004
Stock repurchased during period, shares		41.5	41.6
Stock repurchased during period, value		$ 5,000	$ 5,000
Non-cash reduction to property, plant and equipment	3,700
Noncash additions to properties, plant and equipment	$ 1,362	$ 2,310	$ 1,661