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Commitments and Contingencies (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2023
numberOfMotorVehicle
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2020
USD ($)
Sep. 05, 2023
airbagInflator
Dec. 31, 2022
USD ($)
Jul. 31, 2021
defect
Jun. 30, 2021
USD ($)
Loss Contingencies [Line Items]                        
Number of vehicles recalled | numberOfMotorVehicle 1,000,000,000,000                      
Number of defect airbag inflators | airbagInflator                 52,000,000      
Period of defect airbag inflators           20 years            
Supplier recoveries accrued in period   $ 53   $ 57   $ (636) $ 196          
Maximum liability, guarantees   3,600       3,600       $ 3,100    
Supplier finance obligation   1,100       1,100       852    
Environmental Protection Agency                        
Loss Contingencies [Line Items]                        
Probable loss accrual   450       450            
Increase (decrease) in accrual   139                    
Indirect Tax Matters                        
Loss Contingencies [Line Items]                        
Estimate of possible loss   1,800       1,800            
Takata Passenger-side Airbags                        
Loss Contingencies [Line Items]                        
Probable loss accrual   624       624            
Chevrolet Bolt EV Recall                        
Loss Contingencies [Line Items]                        
Probable loss accrual         $ 1,200             $ 812
Number of manufacturing defects | defect                     2  
Supplier recoveries accrued in period     $ 792     792            
Chevrolet Bolt EV Recall | LG                        
Loss Contingencies [Line Items]                        
Amount awarded to other party         $ 1,900              
GM Korea Subcontract Workers Litigation                        
Loss Contingencies [Line Items]                        
Probable loss accrual   198       198            
Estimate of possible loss   88       88            
Takata Passenger-side Airbags                        
Loss Contingencies [Line Items]                        
Increase in product warranty accrual               $ 1,100        
Accrued Liabilities, Current and Other Liabilities, Noncurrent                        
Loss Contingencies [Line Items]                        
Estimated litigation liability   1,200       1,200       1,100    
Product liability   $ 596       $ 596       $ 561