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Commitments and Contingencies - Additional Information (Detail)
€ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Jul. 19, 2016
USD ($)
Jul. 19, 2016
EUR (€)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
EUR (€)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
EUR (€)
Sep. 30, 2017
USD ($)
site
Sep. 30, 2016
USD ($)
Sep. 30, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]                    
Number of non owned sites             65      
Number of national priority list             15      
Number of sites not named as a potentially responsible party (PRP) the company's liability has been resolved or has been deemed de minimis             59      
Incurred and claims to be resolved over extended period of time             30 years      
Environmental reserves | $             $ 35     $ 35
Non-tax deductible charge         $ 502 € 450   $ 551    
Guarantees at carrying value | $             374     $ 291
Fiat Chrysler Automobiles N.V.                    
Loss Contingencies [Line Items]                    
Other contingencies             $ 235   € 199  
Iveco S.p.A [Member]                    
Loss Contingencies [Line Items]                    
Non-tax deductible charge     $ 49 € 45            
Payment of exceptional non-tax deductible charge $ 543 € 495                
Litigation settlement payment term             The fine was paid by the Company on October 20, 2016.