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Share-based compensation - Performance shares (Detail)
 12 Months Ended
Dec. 31, 2020
€ / shares
shares
Dec. 31, 2020
$ / shares
€ / shares
shares
Dec. 31, 2020
$ / shares
Dec. 31, 2019
€ / shares
Dec. 31, 2019
$ / shares
Euro [Member]          
Share-based compensation [Line Items]          
Number of other equity instruments outstanding in share-based payment arrangement       1,866,864 1,866,864
US Dollar [Member]          
Share-based compensation [Line Items]          
Number of other equity instruments outstanding in share-based payment arrangement       1,731,978 1,731,978
Performance share plans [Member] | Euro [Member]          
Share-based compensation [Line Items]          
Number of other equity instruments outstanding in share-based payment arrangement 3,545,312 3,545,312 3,545,312 3,460,802 3,460,802
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement | € / shares € 41.31 € 41.31   € 39.32  
Number of other equity instruments granted in share-based payment arrangement 1,201,093 1,201,093      
Weighted average exercise price of other equity instruments granted in share-based payment arrangement | € / shares € 44.30        
Notional Dividends [1] 70,865 70,865      
Weighted Average Exercise Price Notional Dividends | € / shares [1] € 41.27        
Number of other equity instruments exercised or vested in share-based payment arrangement 1,525,520 1,525,520      
Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement | € / shares € 38.20        
Number of other equity instruments forfeited in share-based payment arrangement 223,040 223,040      
Weighted average exercise price of other equity instruments forfeited in share-based payment arrangement | € / shares € 40.13        
Number of other equity instruments adjusted quantity | shares [2] 561,111 561,111      
Weighted average exercise price of other equity instruments adjusted quantity | € / shares [2] € 38.30        
Performance share plans [Member] | US Dollar [Member]          
Share-based compensation [Line Items]          
Number of other equity instruments outstanding in share-based payment arrangement 2,412,767 2,412,767 2,412,767 2,213,962 2,213,962
Weighted average exercise price of other equity instruments outstanding in share-based payment arrangement | $ / shares     $ 47.10   $ 45.06
Number of other equity instruments granted in share-based payment arrangement 892,939 892,939      
Weighted average exercise price of other equity instruments granted in share-based payment arrangement | $ / shares   € 48.26      
Notional Dividends [1] 48,548 48,548      
Weighted Average Exercise Price Notional Dividends | $ / shares [1]   € 46.99      
Number of other equity instruments exercised or vested in share-based payment arrangement 929,676 929,676      
Weighted average exercise price of other equity instruments exercised or vested in share-based payment arrangement | $ / shares   € 41.68      
Number of other equity instruments forfeited in share-based payment arrangement 159,526 159,526      
Weighted average exercise price of other equity instruments forfeited in share-based payment arrangement | $ / shares   € 46.52      
Number of other equity instruments adjusted quantity | shares [2] 346,520 346,520      
Weighted average exercise price of other equity instruments adjusted quantity | $ / shares [2]   € 42.34      
[1] Dividend declared in 2020 on outstanding shares.
[2] Adjusted quantity includes the adjustments made to Performance shares outstanding due to updates on the actual and expected EPS.