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Equity and Other Comprehensive Income (Loss) - Summary of Other Reserves (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Reserves [Line Items]      
Opening balance on Jan 1 kr 8,201    
Items that will not be reclassified to profit or loss      
Revaluation of borrowings due to change in credit risk (667) kr 1,030 kr 31
Tax on items that will not be reclassified to profit or loss (114) (3,067) (682)
Cash flow hedge reserve      
Gains/losses arising during the period 754 (701) (542)
Reclassification to profit and loss 1,090 280 (96)
Gains/losses arising during the period   3,703  
Transfer to goodwill   (3,677)  
Translation reserves      
Changes in translation reserves (2,375) [1] 7,130 3,342
Reclassification to profit and loss 59 [1] (85) 46
Share of other comprehensive income of JV and associated companies (10) 49 28
Tax on items that have been or may be reclassified to profit or loss (380) 87 126
Other comprehensive income, net of tax (738) 15,418 5,790
Total comprehensive income (26,842) 34,530 28,770
Transfer to retained earnings   0  
Closing balance on Dec 31 6,759 8,201  
Reserve of exchange differences on translation [member]      
Other Reserves [Line Items]      
Opening balance on Jan 1 8,443 1,206  
Items that will not be reclassified to profit or loss      
Revaluation of borrowings due to change in credit risk 0 0  
Tax on items that will not be reclassified to profit or loss 0 0  
Cash flow hedge reserve      
Gains/losses arising during the period 0 0  
Reclassification to profit and loss 0 0  
Gains/losses arising during the period 0 0  
Transfer to goodwill 0 0  
Translation reserves      
Changes in translation reserves (2,425) 7,273  
Reclassification to profit and loss 59 (85)  
Share of other comprehensive income of JV and associated companies (10) 49  
Tax on items that have been or may be reclassified to profit or loss 0 0  
Other comprehensive income, net of tax (2,376) 7,237  
Total comprehensive income (2,376) 7,237  
Transfer to retained earnings 0 0  
Closing balance on Dec 31 6,067 8,443 1,206
Reserve of cash flow hedges [member]      
Other Reserves [Line Items]      
Opening balance on Jan 1 (719) (411)  
Items that will not be reclassified to profit or loss      
Revaluation of borrowings due to change in credit risk 0 0  
Tax on items that will not be reclassified to profit or loss 0 (758)  
Cash flow hedge reserve      
Gains/losses arising during the period 754 (701)  
Reclassification to profit and loss 1,090 280  
Gains/losses arising during the period 0 3,703  
Transfer to goodwill 0 (3,677)  
Translation reserves      
Changes in translation reserves 0 0  
Reclassification to profit and loss 0 0  
Share of other comprehensive income of JV and associated companies 0 0  
Tax on items that have been or may be reclassified to profit or loss (380) 87  
Other comprehensive income, net of tax 1,464 (1,066)  
Total comprehensive income 1,464 (1,066)  
Transfer to retained earnings 0 758  
Closing balance on Dec 31 745 (719) (411)
Revaluation Of Borrowings [Member]      
Other Reserves [Line Items]      
Opening balance on Jan 1 477 (341)  
Items that will not be reclassified to profit or loss      
Revaluation of borrowings due to change in credit risk (667) 1,030  
Tax on items that will not be reclassified to profit or loss 137 (212)  
Cash flow hedge reserve      
Gains/losses arising during the period 0 0  
Reclassification to profit and loss 0 0  
Gains/losses arising during the period 0 0  
Transfer to goodwill 0 0  
Translation reserves      
Changes in translation reserves 0 0  
Reclassification to profit and loss 0 0  
Share of other comprehensive income of JV and associated companies 0 0  
Tax on items that have been or may be reclassified to profit or loss 0 0  
Other comprehensive income, net of tax (530) 818  
Total comprehensive income (530) 818  
Transfer to retained earnings 0 0  
Closing balance on Dec 31 (53) 477 (341)
Other reserves [member]      
Other Reserves [Line Items]      
Opening balance on Jan 1 8,201 454  
Items that will not be reclassified to profit or loss      
Revaluation of borrowings due to change in credit risk (667) 1,030 31
Tax on items that will not be reclassified to profit or loss 137 (970) (6)
Cash flow hedge reserve      
Gains/losses arising during the period 754 (701) (542)
Reclassification to profit and loss 1,090 280 (96)
Gains/losses arising during the period 0 3,703  
Transfer to goodwill 0 (3,677)  
Translation reserves      
Changes in translation reserves (2,425) [1] 7,273 3,556
Reclassification to profit and loss 59 [1] (85) 46
Share of other comprehensive income of JV and associated companies (10) 49 28
Tax on items that have been or may be reclassified to profit or loss (380) 87 126
Other comprehensive income, net of tax (1,442) 6,989 3,143
Total comprehensive income (1,442) 6,989 3,143
Transfer to retained earnings 0 758  
Closing balance on Dec 31 kr 6,759 kr 8,201 kr 454
[1] Changes in translation reserves include changes regarding translation of goodwill in local currency of SEK –77 million (SEK 5,070 million in 2022 and SEK 2,646 million in 2021), and realized gains/losses net from divested/liquidated companies, SEK 59 million (SEK –85 million in 2022 and SEK 46 million in 2021).