Statement of Cash Flows - Summary of Adjustments to Reconcile Net Income to Cash (Detail) - SEK (kr) kr in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Depreciations	kr 3,861	kr 4,272	kr 4,114
Impairment losses	282	662	274
Adjustments to reconcile net income to cash	30,617	51,710	17,638
Depreciations	2,179	2,427	2,451
Impairment losses	99	154	66
Amortizations	3,980	4,458	3,577
Goodwill	1,260	31,897	0
Total impairments	15,333	31,916	61
Total depreciation, amortization and impairment losses on property, plant and equipment and intangible assets	25,734	43,889	10,543
Taxes	2,540	3,189	5,383
Dividends from associates	111	46	58
Undistributed earnings in associates	348	(104)	(3)
Gains/losses on investments and sale of operations, intangible assets and PP&E, net	153	268	(287)
Other non-cash items	1,731	4,422	1,944
Right-of-use assets [member]
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Adjustments to reconcile net income to cash	2,278	2,581	2,517
Intangible asset and goodwill [member]
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Adjustments to reconcile net income to cash	19,313	36,374	3,638
Property, plant and equipments [member]
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Adjustments to reconcile net income to cash	4,143	4,934	4,388
Capitalized development expenditure [member]
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Amortizations	1,480	1,137	1,586
Customer relationships, IPRs and other intangible assets [member]
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Amortizations	2,500	3,321	1,991
Impairments	kr 14,073	kr 19	kr 61

Adjustments for dividends from joint ventures associated companies.

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Depreciation related to Right-of-use assets.

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Adjustments for amortisation expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss); Depreciation and amortisation expense]

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Adjustments for deferred tax expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Deferred tax expense (income); Profit (loss)]

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Adjustments for depreciation and amortisation expense and impairment loss (reversal of impairment loss) to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Impairment loss; Depreciation and amortisation expense; Impairment loss (reversal of impairment loss) recognised in profit or loss; Profit (loss)]

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Adjustments for depreciation expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

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Adjustments for impairment loss (reversal of impairment loss) on property, plant and equipment recognised in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss; Property, plant and equipment]

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Adjustments to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

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Adjustments for non-cash items to reconcile profit (loss) to net cash flow from (used in) operating activities that the entity does not separately disclose in the same statement or note. [Refer: Profit (loss)]

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