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Shareholder remuneration system and earnings per share - Narrative (Details) - EUR (€)
€ / shares in Units, € in Millions
6 Months Ended
May 18, 2022
May 02, 2022
May 04, 2021
Jun. 30, 2022
Jun. 30, 2021
Shareholder Remuneration [Line Items]          
Dividends recognised as distributions to owners per share (in euro per share)   € 0.0515 € 0.0275    
Dividends recognised as distributions to owners       € 1,236 € 824
Share buyback program, second program, amount of expected shares to be repurchased € 865        
Accumulated retained earnings          
Shareholder Remuneration [Line Items]          
Dividends recognised as distributions to owners   € 869   € 869  
Share premium          
Shareholder Remuneration [Line Items]          
Dividends recognised as distributions to owners     € 477   € 477