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Derivative Instrument - Summary of Derivatives (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]      
Current derivative financial assets ₩ 126,938 ₩ 29,525  
Non-current derivative financial assets 520,845 136,888  
Current derivative financial liabilities 7,291 49,884  
Non-current derivative financial liabilities 70,740 315,235  
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)      
Net income effects of valuation gain (loss) 822,994 (455,715) ₩ 317,350
Net income effects of transaction gain (loss) 84,082 65,393 86,415
Accumulated other comprehensive income (loss) [1] (40,460) 111,220 35,727
Currency forward | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 559 18,332  
Non-current derivative financial assets 6,899 0  
Current derivative financial liabilities 301 10,014  
Non-current derivative financial liabilities 0 4,977  
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)      
Net income effects of valuation gain (loss) 33,066 (40,590) 24,265
Net income effects of transaction gain (loss) 33,032 (17,911) 12,488
Accumulated other comprehensive income (loss) [1] 0 0 0
Currency swap      
Derivative [Line Items]      
Current derivative financial assets 125,877 11,193  
Non-current derivative financial assets 506,957 127,386  
Current derivative financial liabilities 4,446 36,088  
Non-current derivative financial liabilities 16,708 232,669  
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)      
Net income effects of valuation gain (loss) 787,264 (406,607) 310,732
Net income effects of transaction gain (loss) 61,353 93,557 110,813
Accumulated other comprehensive income (loss) [1] (59,108) 105,642 38,802
Currency swap | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 92,313 0  
Non-current derivative financial assets 335,765 82,931  
Current derivative financial liabilities 4,446 0  
Non-current derivative financial liabilities 15,576 93,245  
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)      
Net income effects of valuation gain (loss) 420,551 (108,090) 172,087
Net income effects of transaction gain (loss) 16,265 16,661 52,842
Accumulated other comprehensive income (loss) [1] 0 0 0
Currency swap | Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 33,564 11,193  
Non-current derivative financial assets 171,192 44,455  
Current derivative financial liabilities 0 36,088  
Non-current derivative financial liabilities 1,132 139,424  
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)      
Net income effects of valuation gain (loss) 366,713 (298,517) 138,645
Net income effects of transaction gain (loss) 45,088 76,896 57,971
Accumulated other comprehensive income (loss) [1] (59,108) 105,642 38,802
Interest rate swap      
Derivative [Line Items]      
Current derivative financial assets 502 0  
Non-current derivative financial assets 6,980 9,502  
Current derivative financial liabilities 2,544 3,782  
Non-current derivative financial liabilities 28,138 66,451  
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)      
Net income effects of valuation gain (loss) 18,123 (1,845) (16,231)
Net income effects of transaction gain (loss) (10,303) (10,253) (36,886)
Accumulated other comprehensive income (loss) [1] 18,648 5,578 (3,075)
Interest rate swap | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 502 0  
Non-current derivative financial assets 6,980 9,502  
Current derivative financial liabilities 174 2,192  
Non-current derivative financial liabilities 2,829 22,687  
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)      
Net income effects of valuation gain (loss) 18,123 (309) (15,647)
Net income effects of transaction gain (loss) (10,303) (11,975) (2,495)
Accumulated other comprehensive income (loss) [1] 0 0 0
Interest rate swap | Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 0 0  
Non-current derivative financial assets 0 0  
Current derivative financial liabilities 2,370 1,590  
Non-current derivative financial liabilities 25,309 43,764  
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)      
Net income effects of valuation gain (loss) 0 (1,536) (584)
Net income effects of transaction gain (loss) 0 1,722 (34,391)
Accumulated other comprehensive income (loss) [1] 18,648 5,578 (3,075)
Others | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Current derivative financial assets 0 0  
Non-current derivative financial assets 9 0  
Current derivative financial liabilities [2],[3],[4] 0 0  
Non-current derivative financial liabilities [2],[3],[4] 25,894 11,138  
Disclosure of Gain and loss on valuation and transaction of derivatives and included in finance income and costs in the consolidated statements of comprehensive income (loss)      
Net income effects of valuation gain (loss) (15,459) (6,673) (1,416)
Net income effects of transaction gain (loss) 0 0 0
Accumulated other comprehensive income (loss) [1] ₩ 0 ₩ 0 ₩ 0
[1] For the year ended December 31, 2021, the net loss on valuation of derivatives applying cash flow hedge accounting of ￦15,778 million, net of tax, is included in other comprehensive income (loss).
[2] The Company has an obligation to purchase the shares of Hyundai Green Power Co., Ltd., an associate of the Company from financial investors, and the fair value of the obligation is recorded in ‘Others’.
[3] The Company has an obligation to settle the convertible preferred stock to financial investors pursuant to the settlement contract with Samcheok Eco Materials Co., Ltd. and the fair value of the obligation is recorded in ‘Others’.
[4] The Company has granted stock option to Chester Solar IV SpA, a joint venture of the Company, and 4 other third party investors, and recognized its fair value as other derivative liabilities.