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Investments accounted for using the equity method - Disclosure of ownership percentage and carrying value of investments in joint ventures and associates (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of joint ventures [line items]    
Joint ventures € 7,037 € 6,013
Associates 2,015 2,006
Total joint ventures and associates € 9,052 € 8,019
Zhejiang Leapmotor Technology Co., Ltd. (“Leapmotor”)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 21.30% 21.30%
Associates € 1,349 € 1,409
Archer Aviation Inc (“Archer”)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 16.00% 10.10%
Associates € 206 € 112
Nordex S.A.    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 50.00% 50.00%
Associates € 148 € 142
360 Energy S.A.    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 49.50% 49.50%
Associates € 113 € 105
Stellantis E-Transmission N.V    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 0.00% 56.00%
Associates € 0 € 172
Comau Group S.p.A    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 49.90% 0.00%
Associates € 124 € 0
Others    
Disclosure of joint ventures [line items]    
Associates € 75 € 66
Finance companies in partnership with Group Santander Consumer Finance (“SCF”)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 50.00% 50.00%
Joint ventures € 2,016 € 1,977
Finance companies in partnership with BNPP PF    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 50.00% 50.00%
Joint ventures € 1,086 € 1,096
Tofas-Turk Otomobil Fabrikasi A.S.    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 37.90% 37.90%
Joint ventures € 1,101 € 1,037
NextStar Energy Inc (“NextStar”)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 49.00% 49.00%
Joint ventures € 897 € 397
StarPlus Energy LLC (“StarPlus”)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 49.00% 49.00%
Joint ventures € 763 € 558
Automotive Cells Company SE (“ACC”)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 45.00% 33.30%
Joint ventures € 429 € 155
Leasys SAS    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 50.00% 50.00%
Joint ventures € 424 € 339
Symbio    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 33.30% 33.30%
Joint ventures € 197 € 230
Others    
Disclosure of joint ventures [line items]    
Joint ventures € 124 € 224