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Investment properties - Summary of the fair value of investment property (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
The fair value of investment property [Line Items]    
Land and buildings ₩ 1,160,058 ₩ 741,547
At fair value [member]    
The fair value of investment property [Line Items]    
Fair value of investment property when entity applies cost model 1,160,058 741,547
At fair value [member] | Market approach    
The fair value of investment property [Line Items]    
Fair value of investment property when entity applies cost model 875,056 741,547
At fair value [member] | Income approach    
The fair value of investment property [Line Items]    
Fair value of investment property when entity applies cost model ₩ 285,002 ₩ 0