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Basis of Presentation and Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Millions |  | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2019 | Apr. 30, 2020 | Jun. 30, 2020 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2020 USD ($) entity $ / shares shares | Sep. 30, 2019 USD ($) entity | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Oct. 31, 2016 $ / shares shares
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  |  |  | 500,000,000 |  |  |  | 500,000,000
Preferred stock, shares authorized (in shares) | shares |  |  |  |  | 100,000,000 |  |  |  | 100,000,000
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 |  |  |  | $ 0.001
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 |  |  |  | $ 0.001
Common stock, shares issued (in shares) | shares |  |  |  |  | 93,893,569 |  |  |  | 93,671,810
Cost of sales |  |  |  |  | $ 12,078 | $ 15,725 | $ 16,535 |  |
Number of VIE entities | entity |  |  |  |  | 2 | 2 |  |  |
Engineering, research and development, and other design and development costs |  |  |  |  | $ 293 | $ 303 |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  | 334 |  |  |  |
Operating lease, liability |  |  |  |  | 339 |  |  |  |
Stockholders' equity, including portion attributable to noncontrolling interest |  |  |  |  | (1,535) | (2,189) | (2,717) | $ (4,592) |
Research and development costs |  |  |  |  | 370 | 454 | 513 |  |
Research and development costs reimbursed by customers |  |  |  |  | 223 | 291 | 298 |  |
Foreign currency translation gain (loss) |  |  |  |  | $ (25) | (12) | $ (4) |  |
Cumulative effect, period of adoption, adjustment |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  | 380 |  |  |
Operating lease, liability |  |  |  |  |  | 384 |  |  |
Stockholders' equity, including portion attributable to noncontrolling interest |  |  |  |  |  | $ 4 |  |  |
Other Asia |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Percentage of plants shutdown |  | 50.00% |  |  |  |  |  |  |
Fiat Chrysler Automobiles N.V. | Customer concentration risk | Net sales |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk (as percent) |  |  |  |  | 10.00% | 11.00% | 11.00% |  |
Volkswagen Group | Customer concentration risk | Net sales |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk (as percent) |  |  |  |  | 10.00% | 9.00% | 10.00% |  |
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 |  |  |  |  | $ 85 | $ 117 |  |  |
Costs for molds, dies and other tools to be reimbursed by customer |  |  |  |  | 78 | 101 |  |  |
Noncurrent assets |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Engineering, research and development, and other design and development costs |  |  |  |  | 208 | 186 |  |  |
Costs for molds, dies and other tools to be reimbursed by customer |  |  |  |  | 6 | 28 |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Costs for molds, dies and other tools with title |  |  |  |  | $ 51 | $ 60 |  |  |
Restatement adjustment |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Cost of sales |  |  | $ 8 |  |  |  |  |  |
Unrecorded obligation | Restatement adjustment |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  | $ 8 |  |  |  |  |

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