Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2019	Sep. 30, 2019
Assets, Current [Abstract]
Cash and cash equivalents	$ 162	$ 159
Accounts receivable, net	395	401
Inventories, net	194	194
Prepaid expenses and other current assets	43	43
Total current assets	794	797
Noncurrent assets
Property, plant and equipment, net	479	498
Operating lease assets	253	0
Goodwill and intangibles, net	507	504
Equity method investments	39	34
Deferred income taxes	116	123
Other noncurrent assets	109	108
Total noncurrent assets	1,503	1,267
Total assets	2,297	2,064
Current liabilities
Current portion of long-term debt	22	15
Trade and other payables	153	171
Accrued expenses and other liabilities	246	237
Total current liabilities	421	423
Noncurrent liabilities
Long-term debt	1,320	1,327
Employee benefit obligations	376	387
Operating lease liabilities, noncurrent	224	0
Other noncurrent liabilities	152	185
Total noncurrent liabilities	2,072	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; 188 shares issued and outstanding at December 31, 2019 and September 30, 2019	2	2
Paid-in capital	16	13
Retained deficit	(231)	(284)
Accumulated other comprehensive income	17	11
Total stockholders’ deficit	(196)	(258)
Total liabilities and stockholders’ deficit	$ 2,297	$ 2,064