Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
REVENUE
Revenue	$ 682		$ 709		$ 1,397	$ 1,447
COSTS
TOTAL COST OF REVENUE	311		323		632	654
GROSS PROFIT	371		386		765	793
OPERATING EXPENSES
Selling, general and administrative	248		251		531	508
Research and development	51		52		103	105
Amortization of intangible assets	41		41		82	81
Restructuring charges, net	4		4		7	11
TOTAL OPERATING EXPENSES	968		348		1,347	705
OPERATING (LOSS) INCOME	(597)		38		(582)	88
Interest expense	(53)		(58)		(111)	(118)
Other income (expense), net	15		1		29	23
LOSS BEFORE INCOME TAXES	(635)		(19)		(664)	(7)
(Provision for) benefit from income taxes	(37)		6		(62)	3
NET INCOME (LOSS)	$ (672)	$ (54)	$ (13)	$ 9	$ (726)	$ (4)
LOSS PER SHARE
Net income (loss) per common share - basic (in usd per share)	$ (7.24)		$ (0.12)		$ (7.24)	$ (0.04)
Net income (loss) per common share - diluted (in usd per share)	$ (7.24)		$ (0.12)		$ (7.24)	$ (0.04)
Weighted average shares outstanding
Weighted average number of shares - basic (in shares)	93.0		110.8		101.1	110.5
Weighted average number of shares - diluted (in shares)	93.0		110.8		101.1	110.5
Goodwill, Impairment Loss	$ 624		$ 0		$ 624	$ 0
Products
REVENUE
Revenue	245		287		543	611
COSTS
Total Cost of Goods and Services	92		105		196	220
Amortization of technology intangible assets	44		44		87	87
Services
REVENUE
Revenue	437		422		854	836
COSTS
Total Cost of Goods and Services	$ 175		$ 174		$ 349	$ 347