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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, 2025
Dec. 31, 2024
Disclosure of joint ventures [line items]    
Joint ventures € 5,229 € 7,037
Associates 2,026 2,015
Total joint ventures and associates € 7,255 € 9,052
Zhejiang Leapmotor Technology Co., Ltd. (“Leapmotor”)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 20.00% 21.30%
Associates € 1,274 € 1,349
Archer Aviation Inc (“Archer”)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 8.00% 16.00%
Associates € 218 € 206
Nordex S.A.    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 49.90% 49.90%
Associates € 137 € 148
360 Energy S.A.    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 49.50% 49.50%
Associates € 103 € 113
Comau Group S.p.A.    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 49.90% 49.90%
Associates € 109 € 124
STM Financial, S.A.P.I. de C.V.    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in associate 23.40% 0.00%
Associates € 86 € 0
Others    
Disclosure of joint ventures [line items]    
Associates € 99 € 75
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 € 2,098 € 2,016
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 € 1,084 € 1,086
Tofas-Turk Otomobil Fabrikasi A.S. (“Tofas”)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 37.90% 37.90%
Joint ventures € 1,042 € 1,101
NextStar Energy Inc    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 49.00% 49.00%
Joint ventures € 0 € 897
StarPlus Energy LLC (“StarPlus”)    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 49.00% 49.00%
Joint ventures € 703 € 763
ACC    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 45.90% 45.00%
Joint ventures € 0 € 429
Leasys SAS    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 50.00% 50.00%
Joint ventures € 207 € 424
Symbio    
Disclosure of joint ventures [line items]    
Proportion of ownership interest in joint venture 33.30% 33.30%
Joint ventures € 0 € 197
Others    
Disclosure of joint ventures [line items]    
Joint ventures € 95 € 124