BUSINESS SEGMENT INFORMATION - Schedule of Revenues and Assets by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales	$ 1,028	$ 1,166	$ 1,156	$ 1,038	$ 1,080	$ 1,129	$ 1,066	$ 903	$ 4,388	$ 4,178	$ 3,347
Total assets excluding discontinued operations	2,815				2,726				2,815	2,726
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									2,622	2,289	1,761
Total assets excluding discontinued operations	1,504				1,350				1,504	1,350
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									69	72	69
Total assets excluding discontinued operations	39				36				39	36
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									249	221	234
Total assets excluding discontinued operations	197				224				197	224
Total North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									2,940	2,582	2,064
Total assets excluding discontinued operations	1,740				1,610				1,740	1,610
Sweden
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									276	311	273
Total assets excluding discontinued operations	130				138				130	138
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									234	243	210
Total assets excluding discontinued operations	81				86				81	86
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									165	179	149
Total assets excluding discontinued operations	241				263				241	263
Other Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									91	103	83
Total assets excluding discontinued operations	173				171				173	171
Total Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									766	836	715
Total assets excluding discontinued operations	625				658				625	658
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									248	224	168
Total assets excluding discontinued operations	187				161				187	161
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									153	196	127
Total assets excluding discontinued operations	124				123				124	123
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									197	231	184
Total assets excluding discontinued operations	84				100				84	100
Other Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									84	109	$ 89
Total assets excluding discontinued operations	$ 55				$ 74				$ 55	$ 74