Property, Plant And Equipment (Schedule Of Depreciation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Property, Plant And Equipment [Abstract]
Depreciation expense	$ 379	$ 446	$ 755	$ 686