Statement of Cash Flows - Summary of Adjustments to Reconcile Net Income to Cash (Detail) - SEK (kr) kr in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Depreciations	kr 4,272	kr 4,114	kr 3,674
Impairment losses	662	274	198
Adjustments to reconcile net income to cash	51,710	17,638	17,143
Depreciations	2,427	2,451	2,277
Impairment losses	154	66	0
Amortizations	4,458	3,577	2,507
Goodwill	31,897	0	112
Total impairments	31,916	61	313
Total depreciation, amortization and impairment losses on property, plant and equipment and intangible assets	43,889	10,543	8,969
Taxes	3,189	5,383	6,576
Dividends from joint ventures/associated companies	46	58	90
Undistributed earnings in joint ventures/ associated companies	(104)	(3)	270
Gains/losses on investments and sale of operations, intangible assets and PP&E, net	268	(287)	(971)
Other non-cash items	4,422	1,944	2,209
Right-of-use assets [member]
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Adjustments to reconcile net income to cash	2,581	2,517	2,277
Intangible asset and goodwill [member]
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Adjustments to reconcile net income to cash	36,374	3,638	2,820
Property, plant and equipments [member]
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Adjustments to reconcile net income to cash	4,934	4,388	3,872
Capitalized development expenditure [member]
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Amortizations	1,137	1,586	1,343
Customer relationships, IPRs and other intangible assets [member]
Disclosure Of Adjustments To Reconcile Net Income To Cash [Line Items]
Amortizations	3,321	1,991	1,164
Impairments	kr 19	kr 61	kr 201

Adjustments for dividends from joint ventures associated companies.

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Adjustments for gain loss on sale of investment and operation intangible assets and property plant and equipment net.

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Adjustments for impairment loss on intangible assets.

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Depreciation related to Right-of-use assets.

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Impairment losses reversals of impairments 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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The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

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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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