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Post-Employment Benefits - Summary of Change in the Net Defined Benefit Obligation (Detail) - SEK (kr) kr in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]
Opening balance	kr 23,211	kr 32,188
Included in the income statement
Current service cost	2,291	2,772
Past service cost and gains and losses on settlements	179	311
Interest cost/income (+/–)	468	241
Taxes and administrative expenses	78	62
Other	101	44
Components of defined benefit cost recognized	3,117	3,430
Remeasurements
Return on plan assets excluding amounts in interest expense/income	(663)	14,135
Actuarial gains/losses (–/+) arising from changes in demographic assumptions	267	1,118
Actuarial gains/losses (–/+) arising from changes in financial assumptions	(943)	(29,031)
Experience-based gains/losses (–/+)	347	3,236
Total remeasurements	(992)	(10,542)
Translation difference	(69)	84
Contributions and payments from:
Employers	(2,331)	(1,954)
Plan participants	8	9
Benefit payments	(2)	0
Settlements	0	(4)
Other	0	0
Closing balance	22,942	23,211
Present value of defined benefit obligation [member]
Disclosure of net defined benefit liability (asset) [line items]
Opening balance	83,691	113,543
Included in the income statement
Current service cost	2,291	2,772
Past service cost and gains and losses on settlements	179	311
Interest cost/income (+/–)	2,839	1,716
Taxes and administrative expenses	0	0
Other	108	43
Components of defined benefit cost recognized	5,417	4,842
Remeasurements
Return on plan assets excluding amounts in interest expense/income	0	0
Actuarial gains/losses (–/+) arising from changes in demographic assumptions	267	1,118
Actuarial gains/losses (–/+) arising from changes in financial assumptions	(943)	(29,031)
Experience-based gains/losses (–/+)	347	3,236
Total remeasurements	(329)	(24,677)
Translation difference	(179)	3,381
Contributions and payments from:
Employers	(1,737)	(1,302)
Plan participants	350	334
Benefit payments	(1,294)	(1,806)
Settlements	(488)	(10,759)
Other	104	135
Closing balance	85,535	83,691
Plan assets [member]
Disclosure of net defined benefit liability (asset) [line items]
Opening balance	(60,480)	(81,355)
Included in the income statement
Current service cost	0	0
Past service cost and gains and losses on settlements	0	0
Interest cost/income (+/–)	(2,371)	(1,475)
Taxes and administrative expenses	78	62
Other	(7)	1
Components of defined benefit cost recognized	(2,300)	(1,412)
Remeasurements
Return on plan assets excluding amounts in interest expense/income	(663)	14,135
Actuarial gains/losses (–/+) arising from changes in demographic assumptions	0	0
Actuarial gains/losses (–/+) arising from changes in financial assumptions	0	0
Experience-based gains/losses (–/+)	0	0
Total remeasurements	(663)	14,135
Translation difference	110	(3,297)
Contributions and payments from:
Employers	(594)	(652)
Plan participants	(342)	(325)
Benefit payments	1,292	1,806
Settlements	488	10,755
Other	(104)	(135)
Closing balance	kr (62,593)	kr (60,480)

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Payments from plans net defined benefit liability asset.

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)]

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The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

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The increase (decrease) in the net defined benefit liability (asset) resulting from administration costs in the current period, that are not reflected in return on plan assets. [Refer: Administrative expenses; Net defined benefit liability (asset)] [Contrast: Administration costs not reflected in return on plan assets, defined benefit plans; Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense]

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The increase (decrease) in the net defined benefit liability (asset) resulting from expense (income) included in profit or loss. [Refer: Net defined benefit liability (asset); Profit (loss)] [Contrast: Post-employment benefit expense in profit or loss, defined benefit plans]

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The increase (decrease) in the net defined benefit liability (asset) resulting from miscellaneous other changes. [Refer: Net defined benefit liability (asset); Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss; Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

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The increase (decrease) in the fair value of reimbursement rights related to defined benefit obligation, resulting from foreign currency exchange rate changes on plans measured in a currency that is different from the entity's presentation currency. [Refer: At fair value [member]; Reimbursement rights related to defined benefit obligation, at fair value]

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The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)]

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The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

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The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost and losses (gains) arising from settlements. [Refer: Decrease (increase) in net defined benefit liability (asset) resulting from gains (losses) arising from settlements; Net defined benefit liability (asset)]

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Decrease (increase) in net defined benefit liability (asset) resulting from gains (losses) arising from settlements; Net defined benefit liability (asset); Defined benefit plans [member]]

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The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

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