Property, Plant And Equipment (Schedule Of Depreciation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Property, Plant And Equipment [Abstract]
Depreciation expense	$ 376	$ 323	$ 1,131	$ 1,009