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Risk Management - Summary of Fair Value Measurement of Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income ₩ 435,107 ₩ 358,559 [1]
Derivative assets 661,447 172,910
Financial assets at fair value through profit or loss 1,032,864 1,881,382
At fair value    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 435,107 358,559
Derivative assets 647,783 166,413
Financial assets at fair value through profit or loss 1,032,864 1,881,382
Total 2,115,754 2,406,354
At fair value | Level 1    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 273,826 194,670
Derivative assets 0 0
Financial assets at fair value through profit or loss 0 0
Total 273,826 194,670
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 647,783 166,413
Financial assets at fair value through profit or loss 1,027,067 1,875,690
Total 1,674,850 2,042,103
At fair value | Level 3    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through other comprehensive income 161,281 163,889
Derivative assets 0 0
Financial assets at fair value through profit or loss 5,797 5,692
Total ₩ 167,078 ₩ 169,581
[1] The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide.