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Sales - Summary of Sales (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) ₩ 85,940,137 ₩ 69,184,469 ₩ 58,800,977
Sales related to rendering of services 750,878 714,602 456,400
Sales related to construction services 785,395 646,953 754,998
Total revenue from external customers (Notes 4, 35, 45, 47) 87,476,410 70,546,024 60,012,375
Domestic      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 85,588,151 68,578,390 58,359,774
Sales related to rendering of services 467,661 370,799 252,216
Sales related to construction services 186,996 193,541 159,262
Total revenue from external customers (Notes 4, 35, 45, 47) 86,242,808 69,142,730 58,771,252
Domestic | Electricity      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 82,954,778 66,198,964 57,308,555
Domestic | Heat Supply      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 440,435 489,629 232,738
Domestic | Others      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 2,192,938 1,889,797 818,481
Domestic | Performance obligations satisfied at point in time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) 85,588,151 68,578,390 58,359,774
Domestic | Performance obligations satisfied over time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) 654,657 564,340 411,478
Overseas      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 351,986 606,079 441,203
Sales related to rendering of services 283,217 343,803 204,184
Sales related to construction services 598,399 453,412 595,736
Total revenue from external customers (Notes 4, 35, 45, 47) [1] 1,233,602 1,403,294 1,241,123
Overseas | Electricity      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 0 0 0
Overseas | Heat Supply      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 0 0 0
Overseas | Others      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 351,986 606,079 441,203
Overseas | Performance obligations satisfied at point in time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) 351,986 606,079 441,203
Overseas | Performance obligations satisfied over time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) ₩ 881,616 ₩ 797,215 ₩ 799,920
[1] Middle East and other Asian countries make up the majority of overseas revenue and non-current assets. Since the overseas revenue or non-current assets attributable to particular countries are not material, they are not disclosed individually.