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Consolidated shareholders’ equity - Summary of Number of Restricted Shares Not Yet Fully Vested (Details)
€ in Millions
1 Months Ended 12 Months Ended
May 31, 2023
shares
May 31, 2022
shares
Dec. 31, 2023
EUR (€)
shares
Dec. 31, 2022
EUR (€)
shares
Dec. 31, 2021
EUR (€)
shares
With market condition | Performance share plan one          
Disclosure of classes of share capital [line items]          
Number of options granted (in shares)     126,935 123,940  
Restricted shares          
Disclosure of classes of share capital [line items]          
Total expense for restricted share plans | €     € 231 € 206 € 193
Number of shares not yet fully vested (in shares)     9,773,084 9,245,513 9,507,849
Restricted share plan 2023          
Disclosure of classes of share capital [line items]          
Number of shares not yet fully vested (in shares)     3,780,513 0 0
Restricted share plan 2023 | Performance share plan one          
Disclosure of classes of share capital [line items]          
Number of options granted (in shares)     3,838,434    
Restricted share plan 2023 | With market condition | Performance share plan one          
Disclosure of classes of share capital [line items]          
Number of options granted (in shares)     1,413,387    
Restricted share plan 2022          
Disclosure of classes of share capital [line items]          
Number of shares not yet fully vested (in shares)     3,099,158 3,330,801 0
Restricted share plan 2022 | Performance share plan one          
Disclosure of classes of share capital [line items]          
Number of options granted (in shares)       3,344,432  
Restricted share plan 2022 | With market condition | Performance share plan one          
Disclosure of classes of share capital [line items]          
Number of options granted (in shares)       1,343,805  
Restricted share plan 2021          
Disclosure of classes of share capital [line items]          
Number of shares not yet fully vested (in shares)     2,893,413 3,097,531 3,364,895
Restricted share plan 2021 | Performance share plan one          
Disclosure of classes of share capital [line items]          
Number of options granted (in shares)         3,484,420
Restricted share plan 2021 | With market condition | Performance share plan one          
Disclosure of classes of share capital [line items]          
Number of options granted (in shares) 121,097 114,874     1,274,519
Restricted share plan 2020          
Disclosure of classes of share capital [line items]          
Number of shares not yet fully vested (in shares)     0 2,817,181 3,014,496
Restricted share plan 2019          
Disclosure of classes of share capital [line items]          
Number of shares not yet fully vested (in shares)     0 0 3,128,458