Quarterly Information (unaudited) (Tables)

12 Months Ended

Sep. 30, 2015

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

In millions	First Quarter			Second Quarter			Third Quarter			Fourth Quarter			Total
Fiscal Year Ended September 30, 2015
Revenue	$	1,079		$	995		$	999		$	1,008		$	4,081
Gross profit	638			592			584			616			2,430
Operating income	104			83			84			100			371
(Provision for) benefit from income taxes	(3		)	6			(3		)	(70		)	(70		)
Net income (loss)	$	3		$	(22	)	$	(49	)	$	(76	)	$	(144	)
Fiscal Year Ended September 30, 2014
Revenue	$	1,131		$	1,060		$	1,054		$	1,126		$	4,371
Gross profit	640			597			607			655			2,499
Operating income	87			—			48			62			197
(Provision for) benefit from income taxes	(26		)	(1		)	8			(32		)	(51		)
Net loss	$	(54	)	$	(96	)	$	(62	)	$	(19	)	$	(231	)