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Financial Risk Management - Summary of Financial Instruments (Detail) - SEK (kr) kr in Billions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss | kr 99.9 | kr 100.1
Assets at amortized cost | 4.5 | 4.5
Financial liabilities at FVTPL | (27.4) | (36.9)
Liabilities at amortized cost | (34.9) | (32.2)
Customer finance [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss | 3.1 | 3.8
Customer finance [member] | Level 3 [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss | 3.1 | 3.8
Interest bearing liabilities [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss | 28.1 | 26.6
Interest bearing liabilities [member] | Level 1 [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss | 28.1 | 26.6
Cash equivalents [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss | 23.6 | 23.9
Assets at amortized cost | 3.6 | 3.8
Cash equivalents [member] | Level 2 [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss | 23.6 | 23.9
Other Financial Asset |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss | 1.5 | 1.4
Assets at amortized cost | 0.5 | 0.2
Other Financial Asset | Level 1 [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss |  | 0.2
Other Financial Asset | Level 3 [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss | 1.5 | 1.2
Other Current Assets |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss | 1.5 | 1.3
Other Current Assets | Level 2 [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss | 1.5 | 0.1
Other Current Assets | Level 3 [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through profit or loss |  | 1.2
Trade receivables [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through OCI | 42.1 | 43.1
Trade receivables [member] | Level 3 [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at fair value through OCI | 42.1 | 43.1
Interest bearing securities [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Assets at amortized cost | 0.4 | 0.5
Parent Company borrowings [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Financial liabilities at designated FVTPL | (27.2) | (35.9)
Parent Company borrowings [member] | Level 1 [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Financial liabilities at designated FVTPL | (18.9) | (20.5)
Parent Company borrowings [member] | Level 2 [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Financial liabilities at designated FVTPL | (8.3) | (15.4)
Other current liabilities [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Financial liabilities at FVTPL | (0.2) | (1.0)
Other current liabilities [member] | Level 2 [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Financial liabilities at FVTPL | (0.2) | (1.0)
Trade payables [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Liabilities at amortized cost | (32.0) | (30.4)
Borrowings [member] |  |
Disclosure Of Financial Instruments [Line Items] |  |
Liabilities at amortized cost | kr (2.9) | kr (1.8)

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- Definition The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 8 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of financial assets that are measured at fair value through other comprehensive income. A financial asset shall be measured at fair value through other comprehensive income if both of the following conditions are met: (a) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and (b) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_h&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of financial liabilities at amortised cost. The amortised cost is the amount at which financial liabilities are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 8 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_g&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 8 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_8_f&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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- Definition The amount of financial liabilities that meet either of the following conditions: (a) they meet the definition of held for trading; or (b) upon initial recognition they are designated by the entity as at fair value through profit or loss. An entity may use this designation only when permitted by paragraph 4.3.5 of IFRS 9 (embedded derivatives) or when doing so results in more relevant information, because either: (a) it eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognising the gains and losses on them on different bases; or (b) a group of financial liabilities or financial assets and financial liabilities is managed and its performance is evaluated on a fair value basis, in accordance with a documented risk management or investment strategy, and information about the group is provided internally on that basis to the entity’s key management personnel (as defined in IAS 24). [Refer: At fair value [member]; Key management personnel of entity or parent [member]; Derivatives [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 8 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_e&doctype=Standard -URIDate 2020-01-01 + Details
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