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Borrowings and Debt Securities - Long-term Borrowings (Details)
€ in Millions, ₩ in Millions, ¥ in Millions, JD in Millions, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
KRW (₩)
Dec. 31, 2022
KRW (₩)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
JOD (JD)
Dec. 31, 2023
JPY (¥)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
AUD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
JOD (JD)
Dec. 31, 2022
JPY (¥)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
AUD ($)
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings ₩ 9,188,152 ₩ 6,615,470                    
Less: Discount on long-term borrowings (15,835) (15,719)                    
Less: Current portion of long-term borrowings (5,780,638) (3,638,202)                    
Add: Current portion of discount on long-term borrowings 1,152 774                    
Long-term borrowings 3,392,831 2,962,323                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings ₩ 7,304,875 ₩ 4,981,208                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank Korea Development Bank                    
Purpose of borrowings Others Others                    
Borrowings, interest rate 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%
Borrowings ₩ 1,758 ₩ 2,133                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2024 2023                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2044 2044                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank Korea Development Bank                    
Purpose of borrowings Facility Facility                    
Borrowings ₩ 53,052 ₩ 28,420                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 2.60% 2.50% 2.60% 2.60% 2.60% 2.60% 2.60% 2.50% 2.50% 2.50% 2.50% 2.50%
Borrowings, maturity 2025 2023                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 4.94% 4.60% 4.94% 4.94% 4.94% 4.94% 4.94% 4.60% 4.60% 4.60% 4.60% 4.60%
Borrowings, maturity 2042 2028                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank Korea Development Bank                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis CB rate+0.90 CB rate+0.90                    
Borrowings, maturity 2029 2029                    
Borrowings ₩ 9,985 ₩ 9,985                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank                      
Purpose of borrowings Operating funds Operating funds                    
Borrowings, interest rate basis 1yr KDB rate+0.91 1yr KDB rate +0.81~0.91                    
Borrowings, adjustment to interest rate basis 0.91%   0.91% 0.91% 0.91% 0.91% 0.91%          
Borrowings, maturity 2024                      
Borrowings ₩ 40,000 ₩ 54,300                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   0.81%           0.81% 0.81% 0.81% 0.81% 0.81%
Borrowings, maturity   2023                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   0.91%           0.91% 0.91% 0.91% 0.91% 0.91%
Borrowings, maturity   2024                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Hana Bank and others Hana Bank and others                    
Purpose of borrowings Commercial Paper Commercial Paper                    
Borrowings, interest rate basis 3M CD+0.13~1.20 3M CD+0.13~1.20                    
Borrowings ₩ 5,350,000 ₩ 3,250,000                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13% 0.13%
Borrowings, maturity 2024 2023                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 1.20% 1.20% 1.20% 1.20% 1.20% 1.20% 1.20% 1.20% 1.20% 1.20% 1.20% 1.20%
Borrowings, maturity 2028 2027                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Hana Bank and others Hana Bank and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate 4.60% 4.60% 4.60% 4.60% 4.60% 4.60% 4.60% 4.60% 4.60% 4.60% 4.60% 4.60%
Borrowings, maturity 2028 2028                    
Borrowings ₩ 6,558 ₩ 8,137                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Hana Bank and others Hana Bank and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis 3yr KTB rate-2.50 3yr KTB rate-1.50                    
Borrowings, maturity 2028 2028                    
Borrowings ₩ 3,156 ₩ 3,821                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea Export-Import Bank of Korea                    
Purpose of borrowings Project loans Project loans                    
Borrowings, interest rate 1.00% 1.50% 1.00% 1.00% 1.00% 1.00% 1.00% 1.50% 1.50% 1.50% 1.50% 1.50%
Borrowings, maturity 2026 2026                    
Borrowings ₩ 7,365 ₩ 10,312                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea Export-Import Bank of Korea                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate 1.32% 1.32% 1.32% 1.32% 1.32% 1.32% 1.32% 1.32% 1.32% 1.32% 1.32% 1.32%
Borrowings, maturity 2028 2028                    
Borrowings ₩ 80,000 ₩ 58,100                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bank of Korea Export-Import Bank of Korea                    
Purpose of borrowings Operating funds Operating funds                    
Borrowings, interest rate   1.78%           1.78% 1.78% 1.78% 1.78% 1.78%
Borrowings, interest rate basis 3M Bank debenture rate +0.66                      
Borrowings, maturity 2026 2023                    
Borrowings ₩ 40,000 ₩ 15,700                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Korea Energy Agency                    
Purpose of borrowings Development of power resources Development of power resources                    
Borrowings, interest rate basis 3yr KTB rate-2.25 2.25 3yr KTB rate-2.25 1.50~1.75                    
Borrowings, adjustment to interest rate basis 2.25%   2.25% 2.25% 2.25% 2.25% 2.25%          
Borrowings ₩ 9,176 ₩ 11,175                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   1.50%           1.50% 1.50% 1.50% 1.50% 1.50%
Borrowings, maturity 2024 2023                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   1.75%           1.75% 1.75% 1.75% 1.75% 1.75%
Borrowings, maturity 2028 2028                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Korea Energy Agency                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis 3yr KTB rate-1.50 3yr KTB rate-2.50                    
Borrowings, maturity 2024                      
Borrowings ₩ 163 ₩ 393                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity   2023                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity   2024                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Korea Energy Agency                    
Purpose of borrowings Project loans Project loans                    
Borrowings, interest rate basis 0 0                    
Borrowings, maturity 2033                      
Borrowings ₩ 1,197 ₩ 1,197                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity   2023                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity   2027                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Shinhan Bank and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis CB rate+0.90~1.10 CB rate+0.90~1.10                    
Borrowings ₩ 16,825 ₩ 19,195                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90% 0.90%
Borrowings, maturity 2028 2028                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 1.10% 1.10% 1.10% 1.10% 1.10% 1.10% 1.10% 1.10% 1.10% 1.10% 1.10% 1.10%
Borrowings, maturity 2029 2029                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Shinhan Bank and others                    
Purpose of borrowings Operating funds Commercial Paper                    
Borrowings, interest rate basis 6M Bank debenture rate+0.93 3M CD+0.38                    
Borrowings, maturity 2025 2025                    
Borrowings ₩ 20,000 ₩ 150,000                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Shinhan Bank and others                    
Purpose of borrowings Commercial Paper Others                    
Borrowings, interest rate   3.95%           3.95% 3.95% 3.95% 3.95% 3.95%
Borrowings, interest rate basis 3M CD+0.38                      
Borrowings, maturity 2025 2034                    
Borrowings ₩ 150,000 ₩ 78,905                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Shinhan Bank and others                    
Purpose of borrowings Others Others                    
Borrowings, interest rate 3.95%   3.95% 3.95% 3.95% 3.95% 3.95%          
Borrowings, interest rate basis   Standard overdraft rate+1.00                    
Borrowings, maturity 2034 2034                    
Borrowings ₩ 73,425 ₩ 78,905                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Shinhan Bank and others Kookmin Bank                    
Purpose of borrowings Others Facility                    
Borrowings, interest rate basis Standard overdraft rate+1.00 MOR+0.79 3M CD+1.79 5.04                    
Borrowings, maturity 2034                      
Borrowings ₩ 73,425 ₩ 105,155                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity   2023                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity   2035                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Kookmin Bank Kookmin Bank                    
Purpose of borrowings Facility Others                    
Borrowings, interest rate 5.04% 4.00% 5.04% 5.04% 5.04% 5.04% 5.04% 4.00% 4.00% 4.00% 4.00% 4.00%
Borrowings, interest rate basis 1yr Bank debenture rate +0.78 3M CD+1.79~2.10 5.04                      
Borrowings, maturity   2025                    
Borrowings ₩ 186,032 ₩ 20,700                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 1.79%   1.79% 1.79% 1.79% 1.79% 1.79%          
Borrowings, maturity 2025                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 2.10%   2.10% 2.10% 2.10% 2.10% 2.10%          
Borrowings, maturity 2037                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Woori Bank Woori Bank                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis Standard overdraft rate+1.00 3M CD+1.90 5.04 3M Libor+1.90 5.04                    
Borrowings ₩ 101,172 ₩ 48,823                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   1.90%           1.90% 1.90% 1.90% 1.90% 1.90%
Borrowings, maturity 2034 2035                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   5.04%           5.04% 5.04% 5.04% 5.04% 5.04%
Borrowings, maturity 2042 2042                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor IBK Others                    
Purpose of borrowings Facility Facility                    
Borrowings ₩ 30,690 ₩ 690,259                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 4.00% 3.50% 4.00% 4.00% 4.00% 4.00% 4.00% 3.50% 3.50% 3.50% 3.50% 3.50%
Borrowings, maturity 2042 2028                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 5.80% 6.80% 5.80% 5.80% 5.80% 5.80% 5.80% 6.80% 6.80% 6.80% 6.80% 6.80%
Borrowings, maturity 2044 2044                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Nonghyup Bank Others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis 3M CD+2.00~2.10 CB rate+1.10 1.75~4.56                    
Borrowings, adjustment to interest rate basis   1.10%           1.10% 1.10% 1.10% 1.10% 1.10%
Borrowings ₩ 22,517 ₩ 103,131                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   1.75%           1.75% 1.75% 1.75% 1.75% 1.75%
Borrowings, adjustment to interest rate basis 2.00%   2.00% 2.00% 2.00% 2.00% 2.00%          
Borrowings, maturity 2030 2024                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   4.56%           4.56% 4.56% 4.56% 4.56% 4.56%
Borrowings, adjustment to interest rate basis 2.10%   2.10% 2.10% 2.10% 2.10% 2.10%          
Borrowings, maturity 2041 2036                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others Others                    
Purpose of borrowings Facility PF Refinancing                    
Borrowings, interest rate basis   CB rate+1.25                    
Borrowings, maturity   2030                    
Borrowings ₩ 735,722 ₩ 7,634                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 3.50%   3.50% 3.50% 3.50% 3.50% 3.50%          
Borrowings, maturity 2028                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 6.80%   6.80% 6.80% 6.80% 6.80% 6.80%          
Borrowings, maturity 2042                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others Others                    
Purpose of borrowings Facility PF Refinancing                    
Borrowings, interest rate   4.10%           4.10% 4.10% 4.10% 4.10% 4.10%
Borrowings, interest rate basis CB rate+1.10 3M CD+2.10 1.75~3.30                      
Borrowings, maturity   2030                    
Borrowings ₩ 51,509 ₩ 21,206                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2024                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2041                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others Others                    
Purpose of borrowings PF Refinancing Securitized debts (*)                    
Borrowings, interest rate basis CB rate+1.25 3M CD+1.80                    
Borrowings, maturity 2030 2025                    
Borrowings ₩ 6,680 ₩ 33,476                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others Others                    
Purpose of borrowings PF Refinancing Others                    
Borrowings, interest rate 4.10%   4.10% 4.10% 4.10% 4.10% 4.10%          
Borrowings, maturity 2030                      
Borrowings ₩ 18,556 ₩ 120,217                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   4.40%           4.40% 4.40% 4.40% 4.40% 4.40%
Borrowings, maturity   2023                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   7.90%           7.90% 7.90% 7.90% 7.90% 7.90%
Borrowings, maturity   2039                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others Others                    
Purpose of borrowings Securitized debts (*) Others                    
Borrowings, interest rate basis 3M CD+1.80                      
Borrowings, maturity 2025                      
Borrowings ₩ 52,060 ₩ 49,929                    
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   1.80%           1.80% 1.80% 1.80% 1.80% 1.80%
Borrowings, maturity   2031                    
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   4.50%           4.50% 4.50% 4.50% 4.50% 4.50%
Borrowings, maturity   2034                    
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others                      
Purpose of borrowings Others                      
Borrowings ₩ 113,973                      
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 4.40%   4.40% 4.40% 4.40% 4.40% 4.40%          
Borrowings, maturity 2025                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 7.90%   7.90% 7.90% 7.90% 7.90% 7.90%          
Borrowings, maturity 2039                      
Local long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Others                      
Purpose of borrowings Others                      
Borrowings ₩ 49,879                      
Local long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 1.80%   1.80% 1.80% 1.80% 1.80% 1.80%          
Borrowings, maturity 2031                      
Local long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 4.50%   4.50% 4.50% 4.50% 4.50% 4.50%          
Borrowings, maturity 2034                      
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings ₩ 1,883,277 ₩ 1,634,262                    
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Energy Agency Korea Energy Agency                    
Purpose of borrowings Project loans Project loans                    
Borrowings, interest rate basis 0 0                    
Borrowings, maturity 2026 2026                    
Borrowings ₩ 11,274 ₩ 11,081 $ 8,744         $ 8,744        
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bankof Korea and others Export-Import Bank of Korea and others                    
Purpose of borrowings Direct Loan and others Direct Loan and others                    
Borrowings, interest rate basis 6M Synthetic Libor+1.80~3.20 6M Libor+3.20                    
Borrowings, maturity 2036 2036                    
Borrowings ₩ 101,020 ₩ 98,969 $ 78,347         78,094        
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 1.80%   1.80% 1.80% 1.80% 1.80% 1.80%          
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 3.20%   3.20% 3.20% 3.20% 3.20% 3.20%          
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bankof Korea and others Export-Import Bank of Korea and others                    
Purpose of borrowings Direct Loan and others Direct Loan and others                    
Borrowings, interest rate basis 6M Synthetic Libor+2.25~3.70 3M Libor+2.25~3.70                    
Borrowings, maturity 2027 2027                    
Borrowings ₩ 113,390 ₩ 162,692   JD 62,385         JD 91,051      
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 2.25%   2.25% 2.25% 2.25% 2.25% 2.25%          
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 3.70%   3.70% 3.70% 3.70% 3.70% 3.70%          
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Export-Import Bankof Korea and others Export-Import Bank of Korea and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate basis 6M Synthetic Libor+1.70~2.50 SOFR(1M)+1.83 6M Libor+1.70~2.50SOFR(1M) +1.83                    
Borrowings ₩ 155,909 ₩ 167,496 $ 120,916         $ 132,168        
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   1.70%           1.70% 1.70% 1.70% 1.70% 1.70%
Borrowings, adjustment to interest rate basis 1.70%   1.70% 1.70% 1.70% 1.70% 1.70%          
Borrowings, maturity 2029 2029                    
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   2.50%           2.50% 2.50% 2.50% 2.50% 2.50%
Borrowings, adjustment to interest rate basis 2.50%   2.50% 2.50% 2.50% 2.50% 2.50%          
Borrowings, maturity 2031 2032                    
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Korea Development Bank and others Kookmin Bank and others                    
Purpose of borrowings EBL EBL                    
Borrowings, interest rate basis SOFR(1M)+0.86 SOFR(1M)+0.11~0.75                    
Borrowings, adjustment to interest rate basis 0.86%   0.86% 0.86% 0.86% 0.86% 0.86%          
Borrowings, maturity 2025 2024                    
Borrowings ₩ 183,157 ₩ 189,578 $ 142,049         $ 149,592        
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   0.11%           0.11% 0.11% 0.11% 0.11% 0.11%
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   0.75%           0.75% 0.75% 0.75% 0.75% 0.75%
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor POSCO and others Riyad Bank                    
Purpose of borrowings Shareholder’s loan EBL                    
Borrowings, interest rate basis   SOFR(3M)+1.20                    
Borrowings, maturity 2025 2025                    
Borrowings ₩ 13,887 ₩ 63,201 $ 10,770         $ 49,870        
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 5.60%   5.60% 5.60% 5.60% 5.60% 5.60%          
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 8.00%   8.00% 8.00% 8.00% 8.00% 8.00%          
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor POSCO and others POSCO and others                    
Purpose of borrowings Shareholder’s loan Shareholder’s loan                    
Borrowings, interest rate 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%
Borrowings, maturity 2031 2025                    
Borrowings ₩ 9,850 ₩ 12,680   JD 5,419       $ 10,005        
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Samsung Life Insurance and others POSCO and others                    
Purpose of borrowings Syndicated Loan Shareholder’s loan                    
Borrowings, interest rate   8.00%           8.00% 8.00% 8.00% 8.00% 8.00%
Borrowings, maturity 2032 2031                    
Borrowings ₩ 39,707 ₩ 8,671     ¥ 4,350,671       JD 4,853      
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 3.10%   3.10% 3.10% 3.10% 3.10% 3.10%          
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate 8.00%   8.00% 8.00% 8.00% 8.00% 8.00%          
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Woori Bank and others Samsung Life Insurance and others                    
Purpose of borrowings Syndicated Loan Syndicated Loan                    
Borrowings, interest rate basis JPY 6M Tibor+1.84                      
Borrowings, maturity 2032 2032                    
Borrowings ₩ 21,896 ₩ 45,304     ¥ 2,399,088         ¥ 4,752,934    
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   3.10%           3.10% 3.10% 3.10% 3.10% 3.10%
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   8.00%           8.00% 8.00% 8.00% 8.00% 8.00%
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Solar Construction Lending, LLC Woori Bank and others                    
Purpose of borrowings Facility Syndicated Loan                    
Borrowings, interest rate 5.00%   5.00% 5.00% 5.00% 5.00% 5.00%          
Borrowings, interest rate basis   JPY 6M Libor+1.84                    
Borrowings, maturity 2025 2032                    
Borrowings ₩ 38,545 ₩ 24,910 $ 29,894             ¥ 2,613,385    
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor KiwoomSolar Power Professional Investor Private Placement Investment Trust V Solar Construction Lendings, LLC                    
Purpose of borrowings Senior borrowing Facility                    
Borrowings, interest rate 3.90% 5.00% 3.90% 3.90% 3.90% 3.90% 3.90% 5.00% 5.00% 5.00% 5.00% 5.00%
Borrowings, maturity 2029 2025                    
Borrowings ₩ 57,745 ₩ 39,464       € 40,478   $ 31,140        
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor IFC and others KiwoomSolar Power Professional Investor Private Placement Investment Trust V                    
Purpose of borrowings Facility Senior borrowing                    
Borrowings, interest rate   3.90%           3.90% 3.90% 3.90% 3.90% 3.90%
Borrowings, interest rate basis SOFR(3M)+1.99 SOFR(6M)+5.00 3M BSBY+1.70 6.05~6.62                      
Borrowings, maturity   2029                    
Borrowings ₩ 845,746 ₩ 54,765 $ 655,922               € 40,531  
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2024                      
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, maturity 2031                      
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Hanwha US Solar Private Fund and others IFC and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate 6.00%   6.00% 6.00% 6.00% 6.00% 6.00%          
Borrowings, interest rate basis   6M Libor+5.00 SOFR(3M)+1.83~1.99 5.41~6.19                    
Borrowings, maturity 2039                      
Borrowings ₩ 78,233 ₩ 517,575 $ 60,674         $ 408,408        
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   5.41%           5.41% 5.41% 5.41% 5.41% 5.41%
Borrowings, adjustment to interest rate basis   1.83%           1.83% 1.83% 1.83% 1.83% 1.83%
Borrowings, maturity   2028                    
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, interest rate   6.19%           6.19% 6.19% 6.19% 6.19% 6.19%
Borrowings, adjustment to interest rate basis   1.99%           1.99% 1.99% 1.99% 1.99% 1.99%
Borrowings, maturity   2031                    
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor DBS Bank and others Hanwha US Solar Private Fund and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate   3.00%           3.00% 3.00% 3.00% 3.00% 3.00%
Borrowings, interest rate basis 1M BBSY+1.40~2.25                      
Borrowings, maturity 2025 2038                    
Borrowings ₩ 162,891 ₩ 73,894         $ 185,086 $ 58,308        
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 1.40%   1.40% 1.40% 1.40% 1.40% 1.40%          
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis 2.25%   2.25% 2.25% 2.25% 2.25% 2.25%          
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor Nonghyup Bank and others DBS Bank and others                    
Purpose of borrowings Facility Facility                    
Borrowings, interest rate 10.40%   10.40% 10.40% 10.40% 10.40% 10.40%          
Borrowings, interest rate basis   1M BBSY+1.40~2.25                    
Borrowings, maturity 2039 2025                    
Borrowings ₩ 50,027 ₩ 163,836 $ 38,799                 $ 190,860
Foreign long-term borrowings | Minimum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   1.40%           1.40% 1.40% 1.40% 1.40% 1.40%
Foreign long-term borrowings | Maximum                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Borrowings, adjustment to interest rate basis   2.25%           2.25% 2.25% 2.25% 2.25% 2.25%
Foreign long-term borrowings                        
Disclosure of detailed information about Long-term borrowings [Line Items]                        
Name of Creditor   Others                    
Purpose of borrowings   Others                    
Borrowings, interest rate basis   0                    
Borrowings, maturity   0                    
Borrowings   ₩ 146           $ 116