Segment Information- Disaggregation of Revenue by Geographical Market (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 3,819	$ 3,511	$ 7,667	$ 7,447
United States
Disaggregation of Revenue [Line Items]
Net sales	1,486	1,383	3,034	2,950
Mexico
Disaggregation of Revenue [Line Items]
Net sales	584	574	1,225	1,187
Other Americas
Disaggregation of Revenue [Line Items]
Net sales	82	96	174	219
Americas
Disaggregation of Revenue [Line Items]
Net sales	1,644	1,641	3,381	3,500
Germany
Disaggregation of Revenue [Line Items]
Net sales	315	294	629	615
Czech Republic
Disaggregation of Revenue [Line Items]
Net sales	350	303	688	639
Other EMEA
Disaggregation of Revenue [Line Items]
Net sales	1,389	1,310	2,774	2,647
EMEA
Disaggregation of Revenue [Line Items]
Net sales	1,636	1,488	3,240	3,052
Thailand
Disaggregation of Revenue [Line Items]
Net sales	139	130	244	263
China
Disaggregation of Revenue [Line Items]
Net sales	165	82	354	242
Japan
Disaggregation of Revenue [Line Items]
Net sales	103	106	192	228
Other Asia
Disaggregation of Revenue [Line Items]
Net sales	186	127	363	286
Asia
Disaggregation of Revenue [Line Items]
Net sales	588	444	1,142	1,016
Inter-segment elimination
Disaggregation of Revenue [Line Items]
Net sales	(49)	(62)	(96)	(121)
Inter-segment elimination | Americas
Disaggregation of Revenue [Line Items]
Net sales	(508)	(412)	(1,052)	(856)
Inter-segment elimination | EMEA
Disaggregation of Revenue [Line Items]
Net sales	(418)	(419)	(851)	(849)
Inter-segment elimination | Asia
Disaggregation of Revenue [Line Items]
Net sales	$ (5)	$ (1)	$ (11)	$ (3)