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Financial Risk Management - Summary of Movements in Allowances for Impairment of Trade Receivables and Contract Assets (Detail) - SEK (kr)
kr in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Trade and other receivables [abstract]    
Opening balance kr 2,585 kr 2,492
Balances regarding acquired business 0 (16)
Increase in allowance 265 268
Write-offs (21) (35)
Translation difference (2) (124)
Closing balance kr 2,827 kr 2,585