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Fair value measurement of assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets [Line Items]      
Financial assets at fair value through other comprehensive income ₩ 358,559 ₩ 379,170 ₩ 399,494
Derivative assets 172,910 321,116  
Financial assets at fair value through profit or loss 1,881,382 747,261  
At fair value      
Disclosure of fair value measurement of assets [Line Items]      
Financial assets at fair value through other comprehensive income 358,559 379,170  
Derivative assets 166,413 311,033  
Financial assets at fair value through profit or loss 1,881,382 747,261  
Total 2,406,354 1,437,464  
At fair value | Level 1      
Disclosure of fair value measurement of assets [Line Items]      
Financial assets at fair value through other comprehensive income 194,670 201,202  
Derivative assets 0 0  
Financial assets at fair value through profit or loss 0 0  
Total 194,670 201,202  
At fair value | Level 2      
Disclosure of fair value measurement of assets [Line Items]      
Financial assets at fair value through other comprehensive income 0 0  
Derivative assets 166,413 308,399  
Financial assets at fair value through profit or loss 1,875,690 742,105  
Total 2,042,103 1,050,504  
At fair value | Level 3      
Disclosure of fair value measurement of assets [Line Items]      
Financial assets at fair value through other comprehensive income 163,889 177,968  
Derivative assets 0 2,634  
Financial assets at fair value through profit or loss 5,692 5,156  
Total ₩ 169,581 ₩ 185,758