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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Goodwill [Line Items] |  |  |  |
Goodwill | $ 2,164,000,000 | $ 2,164,000,000 | $ 2,094,000,000 | $ 2,057,000,000
Impairment |  | 0 |  |
Amortization of intangibles |  | 47,000,000 | 50,000,000 | 52,000,000
Anticipated amortization expense, 2025 | 47,000,000 | 47,000,000 |  |
Anticipated amortization expense, 2026 | 46,000,000 | 46,000,000 |  |
Anticipated amortization expense, 2027 | 40,000,000 | 40,000,000 |  |
Anticipated amortization expense, 2028 | 32,000,000 | 32,000,000 |  |
Anticipated amortization expense, 2029 | 32,000,000 | 32,000,000 |  |
EMEA |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | $ 341,000,000 | $ 341,000,000 | $ 317,000,000 | $ 295,000,000
Volkswagen Group | Net sales | Customer concentration risk |  |  |  |
Goodwill [Line Items] |  |  |  |
Concentration risk (as percent) |  | 13.00% | 11.00% |
Valuation, Income Approach | Minimum | Measurement Input, Cap Rate | Significant Unobservable Inputs (Level 3) |  |  |  |
Goodwill [Line Items] |  |  |  |
Reporting unit, measurement input | 15.50% |  |  |
Valuation, Income Approach | Maximum | Measurement Input, Cap Rate | Significant Unobservable Inputs (Level 3) |  |  |  |
Goodwill [Line Items] |  |  |  |
Reporting unit, measurement input | 18.50% |  |  |

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