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Financial Risk Management - Summary of Sensitivity to Interest Rate Increase of One Basis Point (Detail)
kr in Millions
 12 Months Ended
Dec. 31, 2024
SEK (kr)
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point kr 1
Less than three months [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 0
Maturity between 3 and 12 months [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 0
Maturity between 1 and 3 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 0
Maturity between 3 and 5 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 0
More than 5 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 1
Interest Bearing Assets [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point (7)
Interest Bearing Assets [member] | Less than three months [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 0
Interest Bearing Assets [member] | Maturity between 3 and 12 months [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point (1)
Interest Bearing Assets [member] | Maturity between 1 and 3 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point (1)
Interest Bearing Assets [member] | Maturity between 3 and 5 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point (4)
Interest Bearing Assets [member] | More than 5 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point (1)
Interest bearing liabilities [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 8
Interest bearing liabilities [member] | Less than three months [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 0
Interest bearing liabilities [member] | Maturity between 3 and 12 months [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 1
Interest bearing liabilities [member] | Maturity between 1 and 3 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 2
Interest bearing liabilities [member] | Maturity between 3 and 5 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 4
Interest bearing liabilities [member] | More than 5 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 1
Derivatives [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 0
Derivatives [member] | Less than three months [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 0
Derivatives [member] | Maturity between 3 and 12 months [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 0
Derivatives [member] | Maturity between 1 and 3 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point (1)
Derivatives [member] | Maturity between 3 and 5 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point 0
Derivatives [member] | More than 5 years [member]  
Disclosure Of Financial Risk Management [Line Items]  
Sensitivity to interest rate increase of 1 basis point kr 1