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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
Apr. 30, 2024
shares
May 31, 2023
shares
May 31, 2022
shares
Dec. 31, 2024
EUR (€)
shares
Dec. 31, 2023
EUR (€)
shares
Dec. 31, 2022
EUR (€)
shares
With market condition | Performance share plan one            
Disclosure of classes of share capital [line items]            
Number of options granted (in shares)       147,894 126,935 123,940
Disclosure of stock subscription option plan outstanding and option exercised [line items]            
Number of options granted (in shares)       147,894 126,935 123,940
Restricted shares            
Disclosure of classes of share capital [line items]            
Total expense for restricted share plans | € [1]       € 260 € 231 € 206
Number of shares not yet fully vested (in shares) [1]       10,914,134 9,773,084 9,245,513
Restricted Share Plan 2024 Member            
Disclosure of classes of share capital [line items]            
Number of shares not yet fully vested (in shares) [1]       4,454,299 0 0
Restricted Share Plan 2024 Member | Performance share plan one            
Disclosure of classes of share capital [line items]            
Number of options granted (in shares) [2]       4,505,145    
Disclosure of stock subscription option plan outstanding and option exercised [line items]            
Number of options granted (in shares) [2]       4,505,145    
Restricted Share Plan 2024 Member | With market condition | Performance share plan one            
Disclosure of classes of share capital [line items]            
Number of options granted (in shares) 139,665     1,616,643    
Disclosure of stock subscription option plan outstanding and option exercised [line items]            
Number of options granted (in shares) 139,665     1,616,643    
Restricted share plan 2023            
Disclosure of classes of share capital [line items]            
Number of shares not yet fully vested (in shares) [1]       3,501,088 3,780,513 0
Restricted share plan 2023 | Performance share plan one            
Disclosure of classes of share capital [line items]            
Number of options granted (in shares) [2]         3,838,434  
Disclosure of stock subscription option plan outstanding and option exercised [line items]            
Number of options granted (in shares) [2]         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  
Disclosure of stock subscription option plan outstanding and option exercised [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) [1]       2,958,747 3,099,158 3,330,801
Restricted share plan 2022 | Performance share plan one            
Disclosure of classes of share capital [line items]            
Number of options granted (in shares) [2]           3,344,432
Disclosure of stock subscription option plan outstanding and option exercised [line items]            
Number of options granted (in shares) [2]           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)     114,874     1,343,805
Disclosure of stock subscription option plan outstanding and option exercised [line items]            
Number of options granted (in shares)     114,874     1,343,805
Restricted share plan 2021            
Disclosure of classes of share capital [line items]            
Number of shares not yet fully vested (in shares) [1]       0 2,893,413 3,097,531
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        
Disclosure of stock subscription option plan outstanding and option exercised [line items]            
Number of options granted (in shares)   121,097        
Restricted share plan 2020            
Disclosure of classes of share capital [line items]            
Number of shares not yet fully vested (in shares) [1]       0 0 2,817,181
[1] (a)Includes shares awarded in an additional tranche subject to a higher level of market conditions: 147,894 additional shares awarded in 2024, versus 126,935 awarded in 2023 and 123,940 awarded in 2022
[2] (a)Includes shares awarded in an additional tranche subject to a higher level of market conditions: 139,665 additional shares awarded in April 2024 and
8,229 awarded in December 2024 (versus 121,097 awarded in May 2023 and 5,838 awarded in December 2023).