Segment Information- Disaggregation of Revenue by Geographical Market (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 3,936	$ 4,158
United States
Disaggregation of Revenue [Line Items]
Net sales	1,567	1,615
Mexico
Disaggregation of Revenue [Line Items]
Net sales	613	670
Other Americas
Disaggregation of Revenue [Line Items]
Net sales	123	124
Americas
Disaggregation of Revenue [Line Items]
Net sales	1,859	1,935
Germany
Disaggregation of Revenue [Line Items]
Net sales	321	341
Czech Republic
Disaggregation of Revenue [Line Items]
Net sales	336	352
Other EMEA
Disaggregation of Revenue [Line Items]
Net sales	1,337	1,394
EMEA
Disaggregation of Revenue [Line Items]
Net sales	1,564	1,640
Thailand
Disaggregation of Revenue [Line Items]
Net sales	133	162
China
Disaggregation of Revenue [Line Items]
Net sales	160	155
Japan
Disaggregation of Revenue [Line Items]
Net sales	122	141
Other Asia
Disaggregation of Revenue [Line Items]
Net sales	159	193
Asia
Disaggregation of Revenue [Line Items]
Net sales	572	650
Inter-segment elimination
Disaggregation of Revenue [Line Items]
Net sales	(59)	(67)
Inter-segment elimination | Americas
Disaggregation of Revenue [Line Items]
Net sales	(444)	(474)
Inter-segment elimination | EMEA
Disaggregation of Revenue [Line Items]
Net sales	(430)	(447)
Inter-segment elimination | Asia
Disaggregation of Revenue [Line Items]
Net sales	$ (2)	$ (1)