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Commitments, Contingencies and Uncertainties (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2023
vehicle
Jun. 30, 2025
USD ($)
case
subclass
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
case
subclass
Jun. 30, 2024
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2024
USD ($)
Sep. 05, 2023
airbagInflator
Jul. 31, 2023
case
Mar. 31, 2023
subclass
case
Jul. 31, 2021
defect
Loss Contingencies [Line Items]                      
Maximum liability, guarantees   $ 3,700   $ 3,700     $ 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   $ 200 $ 200 $ 400 $ 400            
Takata Passenger-side Airbags                      
Loss Contingencies [Line Items]                      
Number of putative class actions pending | case                   1  
Probable loss accrual   402   $ 402              
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              
Indirect Tax-Related Matters                      
Loss Contingencies [Line Items]                      
Estimate of possible loss   $ 6,600   $ 6,600              
Foreign Emissions Standards                      
Loss Contingencies [Line Items]                      
Loss contingency, pending claims, number | case                 2    
Excessive Oil Consumption                      
Loss Contingencies [Line Items]                      
Number of certified class actions pending | case   2   2              
Faulty 8 Speed Transmissions                      
Loss Contingencies [Line Items]                      
Number of certified class actions pending | case   1   1              
Number of putative 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   26              
Vehicles Defective Fuel Pumps                      
Loss Contingencies [Line Items]                      
Number of certified state subclasses | subclass                   7  
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   $ 1,100   $ 1,100     $ 1,100