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Organization and Summary of Significant Accounting Policies - Narratives (Details) $ in Millions	12 Months Ended
	Sep. 30, 2024 USD ($) entity	Sep. 30, 2023 USD ($) entity	Sep. 30, 2022 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of VIE entities | entity	2	2
Amount funded under accounts receivable repurchase program	$ 170	$ 170
Engineering, research and development, and other design and development costs	310	274
Research and development costs	372	362	$ 322
Research and development costs reimbursed by customers	280	250	194
Foreign currency translation gain (loss)	$ (3)	$ 4	$ 6
Volkswagen Group | Net sales | Customer concentration risk
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Concentration risk (as percent)	13.00%	11.00%
Ford Motor Company | Net sales | Customer concentration risk
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Concentration risk (as percent)	12.00%	11.00%
Stellantis N.V. | Net sales | Customer concentration risk
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Concentration risk (as percent)		10.00%	12.00%
Minimum | Buildings and improvements
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Useful life	3 years
Minimum | Machinery and equipment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Useful life	3 years
Maximum | Buildings and improvements
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Useful life	40 years
Maximum | Machinery and equipment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Useful life	15 years
Current assets
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Engineering, research and development, and other design and development costs	$ 108	$ 104
Costs for molds, dies and other tools to be reimbursed by customer	156	151
Other Noncurrent Assets
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Engineering, research and development, and other design and development costs	202	170
Costs for molds, dies and other tools to be reimbursed by customer	25	11
Property, plant and equipment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Costs for molds, dies and other tools with title	$ 50	$ 53

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