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Post-Employment Benefits - Summary of Pension Costs for Defined Contribution Plans and Defined Benefit Plans (Parenthetical) (Detail) - SEK (kr) kr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Defined Benefit Plans Expense Recognized In Income Statement [Line Items]
Defined benefit plans interest cost	kr 647	kr 517	kr 361
United Kingdom [member]
Disclosure Of Defined Benefit Plans Expense Recognized In Income Statement [Line Items]
Defined benefit plans net interest income	624	626	355
Defined benefit plans interest cost	kr 532	kr 514	kr 312

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- Definition

Disclosure Of Defined Benefit Plans Expense Recognized In Income Statement [line items]

+ References

No definition available.

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- Definition

The amount of interest expense arising from defined benefit plans. [Refer: Interest expense; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
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- Definition

The amount of interest income arising from defined benefit plans. [Refer: Interest income; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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