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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