Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2020	Sep. 30, 2019
Assets, Current [Abstract]
Cash and cash equivalents	$ 774	$ 159
Accounts receivable, net	352	401
Inventories, net	209	194
Prepaid expenses and other current assets	49	43
Total current assets	1,384	797
Noncurrent assets
Property, plant and equipment, net	509	498
Operating lease assets	254	0
Goodwill and intangibles, net	503	504
Equity method investments	37	34
Deferred income taxes	99	123
Other noncurrent assets	131	108
Total noncurrent assets	1,533	1,267
Total assets	2,917	2,064
Current liabilities
Current portion of long-term debt	0	15
Trade and other payables	186	171
Accrued expenses and other liabilities	215	237
Total current liabilities	401	423
Noncurrent liabilities
Long-term debt	2,003	1,327
Employee benefit obligations	361	387
Operating lease liabilities, noncurrent	226	0
Other noncurrent liabilities	163	185
Total noncurrent liabilities	2,753	1,899
Commitments and contingencies
Stockholders’ deficit
Preferred stock, no par value, 40 shares authorized; no shares issued and outstanding	0	0
Common stock, par value $0.01 per share, 400 shares authorized; 185 and 188 shares issued and outstanding at March 31, 2020 and September 30, 2019, respectively	2	2
Paid-in capital	16	13
Retained deficit	(249)	(284)
Accumulated other comprehensive (loss) income	(6)	11
Total stockholders’ deficit	(237)	(258)
Total liabilities and stockholders’ deficit	$ 2,917	$ 2,064