Condensed Consolidated Statements Of Financial Position (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Property, plant and equipment, accumulated depreciation	$ 16,476	$ 16,286
Other assets, accumulated amortization	$ 478	$ 451
Common stock, par value	$ 5.00	$ 5.00
Common stock, authorized	1,200,000,000	1,200,000,000
Common stock, shares issued	1,012,261,159.000000	1,012,261,159.000000
Treasury stock, shares	372,446,158	345,637,354