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Other information - Supplemental Cash Flow Information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investment in consolidated subsidiaries and businesses      
Current assets € 408 € 147  
Non-current assets 1,985 1,981  
Net borrowings (91) (541)  
Current and non-current liabilities (622) (366)  
Net effect of investments 1,680 1,221  
Goodwill 25 482 € 1,574
Fair value of investments held before the acquisition of control (271) (21)  
Non-controlling interests (2) (15)  
Purchase price 1,432 1,667  
Less: Cash and cash equivalents acquired (155) (31)  
Consolidated subsidiaries and businesses net of cash and cash equivalent disposed of before business combination 1,277 1,636 1,901
Disposal of consolidated subsidiaries and businesses      
Current assets 130 1,377  
Non-current assets 153 8,618  
Net borrowings 180 (2,085)  
Current and non-current liabilities (124) (2,351)  
Net effect of disposals 339 5,559  
Current value of the stake held for business combinations (580) (5,726)  
Reclassification among other items of OCI (7) (918)  
Gain on disposal of business combinations 427 2,704  
Fair value of share capital held after the sale of control 414    
Credits for divestments (173) (1,609)  
Selling price 420 10  
Less: Cash and cash equivalents sold (25) (70)  
Consolidated subsidiaries and businesses net of cash and cash equivalent disposed of € 395 € (60) 76
Business combinations excluding Union Fenosa Gas      
Investment in consolidated subsidiaries and businesses      
Current assets     262
Non-current assets     1,124
Net borrowings     (486)
Current and non-current liabilities     (349)
Net effect of investments     551
Fair value of investments held before the acquisition of control     (99)
Non-controlling interests     (4)
Purchase price     2,022
Less: Cash and cash equivalents acquired     (121)
Consolidated subsidiaries and businesses net of cash and cash equivalent disposed of before business combination     1,901
Disposal of consolidated subsidiaries and businesses      
Current assets     2
Net effect of disposals     2
Selling price     2
Consolidated subsidiaries and businesses net of cash and cash equivalent disposed of     2
Union Fenosa Gas SA      
Investment in consolidated subsidiaries and businesses      
Value of investment sold     232
Current assets     370
Non-current assets     378
Net borrowings     (128)
Current and non-current liabilities     (420)
Net effect of investments     200
Less: Cash and cash equivalents acquired     42
Disposal of consolidated subsidiaries and businesses      
Net effect of disposals     32
Consolidated subsidiaries and businesses net of cash and cash equivalent disposed of     € 74