Consolidated Statements Of Comprehensive Loss - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Consolidated Statements Of Comprehensive Loss [Abstract]
Net loss	$ (27)	$ (28)	$ (213)	$ (79)
Other comprehensive income, net of tax (see Note 12)	5	5	11	8
Comprehensive loss	$ (22)	$ (23)	$ (202)	$ (71)