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Commitments, Contingencies and Uncertainties (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2023
vehicle
Sep. 30, 2025
USD ($)
case
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
case
Sep. 30, 2024
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2025
subclass
Dec. 31, 2024
USD ($)
Sep. 05, 2023
airbagInflator
Jul. 31, 2023
case
Mar. 31, 2023
case
subclass
Jul. 31, 2021
defect
Loss Contingencies [Line Items]                        
Maximum liability, guarantees   $ 4,000   $ 4,000       $ 3,700        
Supplier finance obligation   $ 1,700   $ 1,700       $ 900        
Supplier finance program, obligation, statement of financial position [extensible enumeration]   Accounts payable (principally trade)   Accounts payable (principally trade)       Accounts payable (principally trade)        
Compliance related costs   $ 300 $ 200 $ 700 $ 600              
Carrying amount of acquired credits   1,200   1,200                
Takata Passenger-side Airbags                        
Loss Contingencies [Line Items]                        
Number of putative class actions pending | case                     1  
Probable loss accrual   394   $ 394                
A R C Matters                        
Loss Contingencies [Line Items]                        
Number of vehicles recalled | vehicle 1,000,000                      
Number of defect airbag inflators | airbagInflator                 52,000,000      
Period of defect airbag inflators       20 years                
Chevrolet Bolt EV Recall                        
Loss Contingencies [Line Items]                        
Probable loss accrual   2,700   $ 2,700                
Number of manufacturing defects | defect                       2
Remaining accrual amount   300   300                
Chevrolet Bolt EV Recall | LG                        
Loss Contingencies [Line Items]                        
Receivable amount       1,700                
Privacy and Consumer Protection Matters                        
Loss Contingencies [Line Items]                        
Probable loss accrual   300   300                
Indirect Tax-Related Matters                        
Loss Contingencies [Line Items]                        
Estimate of possible loss   $ 6,700   $ 6,700                
Foreign Emissions Standards                        
Loss Contingencies [Line Items]                        
Loss contingency, pending claims, number | case                   2    
Faulty 8 Speed Transmissions                        
Loss Contingencies [Line Items]                        
Number of putative class actions pending | case   1   1                
Number of certified class actions pending | case   1   1                
Model Year 2015-2019 Vehicles                        
Loss Contingencies [Line Items]                        
Number of certified state subclasses | subclass                     26  
Number of decertified state subclasses | subclass             26          
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   $ 1,400   $ 1,400       $ 1,100