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Financial Risk Management - Disclosure of Customer Finance Fair Value Reconciliation (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Customer Finance Reconciliation [Abstract]    
Opening balance kr 6,917 kr 5,370
Additions 20,758 49,583
Disposals/repayments (23,920) (47,409)
Revaluation/amortization of interest 407 (467)
Translation difference 360 (160)
Closing balance 4,522 6,917
Of which non-current kr 190 kr 1,347