Information Relating to the Consolidated Statement of Cash Flows (Details 1) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Share repurchase price	$ 2	$ 2	$ 5,006
Stock repurchased during period, shares			41.5
Stock repurchased during period, value			$ 5,000
Non-cash reduction to property, plant and equipment		2,800
Noncash additions to properties, plant and equipment	$ 56	$ 1,362	$ 2,310