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Share Based Compensation - Summary of FV Per Performance Criteria and Program (Detail) - kr / shares
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Executive performance plan [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value ESG - Social   kr 58.42      
Key contributor plan [member] | Fair value – Tranche 1 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value kr 61.12 60.31 kr 94.13 kr 109.8  
Key contributor plan [member] | Fair value – Tranche 2 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value 58.4 61.13 60.31 94.13  
Key contributor plan [member] | Fair value – Tranche 3 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value 55.81 58.42 61.13 60.31  
Executive team plans [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value Group operating income 47.8 71.45 110.7 74.22 kr 86.94
Fair value ESG - Environmental 47.8 71.45      
Fair Value Absolute T S R [member] | Executive performance plan [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value of TSR market related condition   2.3      
Fair Value Relative T S R [member] | Executive performance plan [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value of TSR market related condition   2.4      
Long-term variable compensation program [member] | Executive performance plan [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value Group operating income   58.42 61.13 60.31  
Fair value ESG - Environmental   58.42      
Long-term variable compensation program [member] | Executive team plans [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Share price at grant 55.59 78.88 116.66 78.88 90.7
Fair value ESG - Social 47.8 71.45      
Long-term variable compensation program [member] | Fair Value Absolute T S R [member] | Executive team plans [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value absolute TSR 32.75 41.18 113.47 54.69 87.92
Long-term variable compensation program [member] | Fair Value Relative T S R [member] | Executive team plans [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Fair value relative TSR kr 39.4 kr 54.48 kr 108.61 kr 98.06 kr 94.63