Property, Plant And Equipment (Property, Plant And Equipment, Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Property, Plant And Equipment [Abstract]
Property, plant and equipment	$ 25,626	$ 25,541
Less: Accumulated depreciation	(11,010)	(10,639)
Property, plant and equipment, net	14,616	$ 14,902
Sale Leaseback Transaction, Gross Proceeds, Investing Activities	70
Sale Leaseback Transaction, Deferred Gain, Gross	$ 52