Equity and Other Comprehensive Income (Loss) - Summary of Changes in OCI by Components of Equity (Parenthetical) (Detail) - Translation reserves [member] - SEK (kr) kr in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of classes of share capital [line items]
Realized gains losses net from liquidated operations	kr 73	kr 59	kr (85)
Increase (decrease) through net exchange differences, goodwill	kr 4,393	kr (77)	kr 5,070

The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2024-01-01
-Paragraph B67
-Subparagraph d
-Clause vi
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B67_d_vi&doctype=Appendix&subtype=B
-URIDate 2024-03-27

Name:	ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration