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Financial Risk Management - Summary of Aging Analysis of Gross Values of Trade Receivables and Contracts Assets by Risk Category (Detail) - SEK (kr)
kr in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category kr 53,902 kr 52,799
Not due [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 45,864 45,164
Maturity within 3 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 4,388 3,772
Later than 3 months and not later than 6 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 524 858
Later than 6 months and not later than 12 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 571 558
Longer than 1 year [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 2,555 2,447
Country risk Low [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 37,489 30,767
Country risk Low [member] | Not due [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 33,801 27,431
Country risk Low [member] | Maturity within 3 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 2,914 2,434
Country risk Low [member] | Later than 3 months and not later than 6 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 243 445
Country risk Low [member] | Later than 6 months and not later than 12 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 270 137
Country risk Low [member] | Longer than 1 year [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 261 320
Country risk medium [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 11,395 16,251
Country risk medium [member] | Not due [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 9,379 14,369
Country risk medium [member] | Maturity within 3 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 1,025 826
Country risk medium [member] | Later than 3 months and not later than 6 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 164 227
Country risk medium [member] | Later than 6 months and not later than 12 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 168 224
Country risk medium [member] | Longer than 1 year [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 659 605
Country risk high [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 5,018 5,781
Country risk high [member] | Not due [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 2,684 3,364
Country risk high [member] | Maturity within 3 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 449 512
Country risk high [member] | Later than 3 months and not later than 6 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 117 186
Country risk high [member] | Later than 6 months and not later than 12 months [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category 133 197
Country risk high [member] | Longer than 1 year [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Aging analysis by risk category kr 1,635 kr 1,522