Pension Plan And Other Postretirement Benefits (Pension And Other Postretirement Benefit Costs) (Details) - Pension Benefits [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 3	$ 8	$ 7
Interest cost	2	2	3	3
Expected return on plan assets	(2)	(2)	(4)	(4)
Amortization of net loss			1
Net periodic benefit cost	$ 4	$ 3	$ 8	$ 6