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Taxes - Reconciliation of Swedish Income Tax Rate with Effective Tax Rate (Detail) - SEK (kr)
kr in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Calculated tax expense at Swedish tax rate of 20.6% kr (533) kr 4,804 kr (5,070)
Effect of foreign tax rates 430 (884) (605)
Current income taxes related to prior years (162) 118 253
Remeasurement of tax loss carry-forwards (973) (28) (49)
Remeasurement of deductible temporary differences 308 394 15
Withholding tax expense (780) (217) 0
Recognition of previously expensed withholding tax 0 0 411
Tax effect of non-deductible expenses (1,045) (7,311) (760)
Tax effect of non-taxable income 655 335 327
Tax effect of changes in tax rates (62) 4 (19)
Pillar Two tax expense (53)    
Income tax expense kr (2,215) kr (2,785) kr (5,497)
Effective tax rate 85.60% (11.90%) 22.30%