Segment Information - Disaggregation of Revenue by Geographical Market (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 3,242	$ 1,626	$ 10,909	$ 9,073
United States
Disaggregation of Revenue [Line Items]
Net sales	1,298	519	4,332	3,469
Mexico
Disaggregation of Revenue [Line Items]
Net sales	558	192	1,783	1,379
Other Americas
Disaggregation of Revenue [Line Items]
Net sales	64	17	238	236
Americas
Disaggregation of Revenue [Line Items]
Net sales	1,440	593	4,821	4,093
Germany
Disaggregation of Revenue [Line Items]
Net sales	261	150	891	765
Czech Republic
Disaggregation of Revenue [Line Items]
Net sales	276	166	964	806
Other EMEA
Disaggregation of Revenue [Line Items]
Net sales	1,144	571	3,918	3,217
EMEA
Disaggregation of Revenue [Line Items]
Net sales	1,328	698	4,568	3,750
Thailand
Disaggregation of Revenue [Line Items]
Net sales	113	44	357	307
China
Disaggregation of Revenue [Line Items]
Net sales	171	130	525	372
Japan
Disaggregation of Revenue [Line Items]
Net sales	60	34	253	262
Other Asia
Disaggregation of Revenue [Line Items]
Net sales	177	140	539	425
Asia
Disaggregation of Revenue [Line Items]
Net sales	516	346	1,658	1,362
Inter-segment elimination
Disaggregation of Revenue [Line Items]
Net sales	(42)	(11)	(138)	(132)
Inter-segment elimination | Americas
Disaggregation of Revenue [Line Items]
Net sales	(480)	(135)	(1,532)	(991)
Inter-segment elimination | EMEA
Disaggregation of Revenue [Line Items]
Net sales	(353)	(189)	(1,205)	(1,038)
Inter-segment elimination | Asia
Disaggregation of Revenue [Line Items]
Net sales	$ (5)	$ (2)	$ (16)	$ (4)