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Share Based Compensation - Summary of Shares for All Plans (Parenthetical) (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |
Compensation cost |  | kr 256 | kr 645
2016 plan [member] |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |
Outstanding share option vesting percentage | 22.00% |  |
Outstanding share option lapsed percentage | 78.00% |  |

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- Definition Outstanding share options lapsed percentage. + References No definition available. + Details
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- Definition Outstanding share options vested percentage. + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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