Consolidated Statements Of Comprehensive Loss - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Consolidated Statements Of Comprehensive Loss [Abstract]
Net loss	$ (80)	$ (14)	$ (293)	$ (93)
Other comprehensive income (loss), net of tax	(61)	5	(50)	13
Comprehensive loss	$ (141)	$ (9)	$ (343)	$ (80)