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Share Based Compensation - Summary of FV Per Performance Criteria and Program (Detail) - kr / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Executive performance plan [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value Group operating income | kr 96.54 | kr 97.71 | kr 99.29 |
Key contributor plan [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value |  |  | 99.29 | kr 84.12
Key contributor plan [member] | Fair value – Tranche 1 [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value | 99.68 | 84.12 |  |
Key contributor plan [member] | Fair value – Tranche 2 [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value | 98.10 | 99.29 |  |
Key contributor plan [member] | Fair value – Tranche 3 [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value | 96.54 | 97.71 |  |
Fair Value Absolute T S R | Executive performance plan [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value Group operating income | 98.37 | 113.49 | 198.56 | 84.12
Fair Value Relative T S R | Executive performance plan [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value Group operating income | 125.35 | 130.59 | 198.56 | 84.12
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 | 78.88 | 90.70 | 65.79 | 57.15
Fair value Group operating income | 74.22 | 86.94 | 62.93 |
Long-term variable compensation program [member] | Fair Value Absolute T S R | Executive team plans [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value Group operating income | 54.69 | 87.92 | 80.40 | 54.40
Long-term variable compensation program [member] | Fair Value Relative T S R | Executive team plans [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Fair value Group operating income | kr 98.06 | kr 94.63 | kr 78.66 | kr 76.95

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