Reclassifications From Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2015	$ (48)
Other comprehensive income before reclassifications	8
Amounts reclassified from/to other comprehensive income (loss)	1
Net current-period other comprehensive income (loss)	9
Ending balance, September 30, 2016	(39)
Pension And Other Postretirement [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2015	(25)
Other comprehensive income before reclassifications	5
Amounts reclassified from/to other comprehensive income (loss)	1
Net current-period other comprehensive income (loss)	6
Ending balance, September 30, 2016	(19)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2015	(23)
Other comprehensive income before reclassifications	3
Amounts reclassified from/to other comprehensive income (loss)
Net current-period other comprehensive income (loss)	3
Ending balance, September 30, 2016	$ (20)