Consolidated Statements of Changes in Stockholder's Deficiency - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		$ (3,069)		$ (2,669)	$ (3,069)	$ (2,669)	$ (2,436)
Share-based compensation					19	25	11
Net loss	$ (76)	3	$ (19)	(54)	(144)	(231)	(364)
Other comprehensive income (loss)					(184)	(194)	120
Ending Balance	(3,378)		(3,069)		(3,378)	(3,069)	(2,669)
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		0		0	0	0	0
Ending Balance	0		0		0	0	0
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		2,962		2,937	2,962	2,937	2,926
Share-based compensation					19	25	11
Ending Balance	2,981		2,962		2,981	2,962	2,937
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		(4,831)		(4,600)	(4,831)	(4,600)	(4,236)
Net loss					(144)	(231)	(364)
Ending Balance	(4,975)		(4,831)		(4,975)	(4,831)	(4,600)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance		$ (1,200)		$ (1,006)	(1,200)	(1,006)	(1,126)
Other comprehensive income (loss)					(184)	(194)	120
Ending Balance	$ (1,384)		$ (1,200)		$ (1,384)	$ (1,200)	$ (1,006)