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Other information - Supplemental Cash Flow Information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Investment in consolidated subsidiaries and businesses      
Current assets € 147   € 15
Non-current assets 2,463   193
Net borrowings (541)   (64)
Current and non-current liabilities (366)   (17)
Net effect of investments 1,703   127
Fair value of investments held before the acquisition of control (21)    
Non-controlling interests (15)   (15)
Purchase price 1,667   112
Cash and cash equivalents acquired (31)   (3)
Consolidated subsidiaries and businesses net of cash and cash equivalent disposed of before business combination 1,636 € 1,901 € 109
Disposal of consolidated subsidiaries and businesses      
Current assets 1,377    
Non-current assets 8,618    
Net borrowings (2,085)    
Current and non-current liabilities (2,351)    
Net effect of disposals 5,559    
Current value of the stake held for business combinations (5,726)    
Reclassification among other items of OCI (918)    
Gain on disposal of business combinations 2,704    
Credits for divestments (1,609)    
Selling price 10    
Cash and cash equivalents sold (70)    
Consolidated subsidiaries and businesses net of cash and cash equivalent disposed of € (60) 76  
Business combinations excluding Union Fenosa Gas      
Investment in consolidated subsidiaries and businesses      
Current assets   262  
Non-current assets   2,698  
Net borrowings   (486)  
Current and non-current liabilities   (349)  
Net effect of investments   2,125  
Fair value of investments held before the acquisition of control   (99)  
Non-controlling interests   (4)  
Purchase price   2,022  
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  
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