Reclassifications From Accumulated Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2015	$ (48)
Other comprehensive income before reclassifications	7
Net current-period other comprehensive income (loss)	7
Ending balance, June 30, 2016	(41)
Pension And Other Postretirement [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2015	(25)
Other comprehensive income before reclassifications	4
Amounts reclassified from/to other comprehensive income (loss)
Net current-period other comprehensive income (loss)	4
Ending balance, June 30, 2016	(21)
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, June 30, 2016	$ (20)