Reclassifications From Accumulated Other Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2015	$ (48)
Other comprehensive income (loss) before reclassifications	3
Amounts reclassified from/to other comprehensive income	1
Net current-period other comprehensive loss	4
Ending balance, March 31, 2016	(44)
Pension And Other Postretirement [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2015	$ (25)
Other comprehensive income (loss) before reclassifications
Amounts reclassified from/to other comprehensive income	$ 1
Net current-period other comprehensive loss	1
Ending balance, March 31, 2016	(24)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2015	(23)
Other comprehensive income (loss) before reclassifications	$ 3
Amounts reclassified from/to other comprehensive income
Net current-period other comprehensive loss	$ 3
Ending balance, March 31, 2016	$ (20)