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Share-based compensation - Performance shares (Detail)
 12 Months Ended
Dec. 31, 2023
€ / shares
shares
Dec. 31, 2023
$ / shares
€ / shares
shares
Dec. 31, 2022
€ / shares
shares
Dec. 31, 2022
$ / shares
€ / shares
shares
Dec. 31, 2023
$ / shares
Dec. 31, 2022
$ / shares
Dec. 31, 2021
€ / shares
Dec. 31, 2021
$ / shares
Euro [Member]                
Share-based compensation [Line Items]                
Number of other equity instruments outstanding in share-based payment arrangement     2,321,250 2,321,250   2,321,250 1,618,488 1,618,488
Weighted average exercise price of other equity instruments forfeited in share-based payment arrangement € 22.16              
Euro [Member] | Performance share plans [Member]                
Share-based compensation [Line Items]                
Number of other equity instruments outstanding in share-based payment arrangement 5,392,035 5,392,035 4,385,837 4,385,837 5,392,035 4,385,837 3,097,713 3,097,713
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement € 27.22 € 27.22 € 33.13 € 33.13     € 45.28  
Number of other equity instruments granted in share-based payment arrangement 2,299,280 2,299,280 2,323,435 2,323,435        
Weighted average exercise price of other equity instruments granted in share-based payment arrangement € 23.65   € 20.55          
Notional Dividends [1] 240,977 240,977 155,067 155,067        
Weighted Average Exercise Price Notional Dividends [1] € 27.15   € 33.91          
Number of other equity instruments exercised or vested in share-based payment arrangement (154,987) (154,987) (434,329) (434,329)        
Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement € 44.08   € 40.9          
Number of other equity instruments forfeited in share-based payment arrangement (489,295) (489,295) (233,556) (233,556)        
Weighted average exercise price of other equity instruments forfeited in share-based payment arrangement € 27.05   € 38.67          
Number of other equity instruments adjusted quantity | shares [2] (889,777) (889,777) (522,493) (522,493)        
Weighted average exercise price of other equity instruments adjusted quantity [2] € 44.27   € 40.48          
US Dollar [Member]                
Share-based compensation [Line Items]                
Number of other equity instruments outstanding in share-based payment arrangement     2,345,263 2,345,263   2,345,263 1,611,021 1,611,021
US Dollar [Member] | Performance share plans [Member]                
Share-based compensation [Line Items]                
Number of other equity instruments outstanding in share-based payment arrangement 3,261,048 3,261,048 2,749,983 2,749,983 3,261,048 2,749,983 2,005,000 2,005,000
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement | $ / shares         $ 29.73 $ 36.66   $ 51.48
Number of other equity instruments granted in share-based payment arrangement 1,667,812 1,667,812 1,530,585 1,530,585        
Weighted average exercise price of other equity instruments granted in share-based payment arrangement | $ / shares   € 25.96   € 21.93        
Notional Dividends [1] 152,750 152,750 98,883 98,883        
Weighted Average Exercise Price Notional Dividends | $ / shares [1]   € 29.78   € 37.15        
Number of other equity instruments exercised or vested in share-based payment arrangement (121,760) (121,760) (248,848) (248,848)        
Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement | $ / shares   € 48.33   € 45.23        
Number of other equity instruments forfeited in share-based payment arrangement (596,846) (596,846) (309,570) (309,570)        
Weighted average exercise price of other equity instruments forfeited in share-based payment arrangement | $ / shares   € 28.95   € 44.04        
Number of other equity instruments adjusted quantity | shares [2] (590,890) (590,890) (326,066) (326,066)        
Weighted average exercise price of other equity instruments adjusted quantity | $ / shares [2]   € 48.28   € 45.26        
[1] Dividend declared in 2023 on outstanding shares.
[2] Adjusted quantity includes the adjustments made to Performance shares outstanding due to updates on the actual TSR, EPS, and SDG.