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Sales - Summary of Sales (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of performance obligations [line items]      
Sales of goods ₩ 69,184,469 ₩ 58,800,977 ₩ 56,685,109
Sales related to rendering of services 714,602 456,400 429,350
Sales related to construction services 646,953 754,998 812,175
Total revenue from external customers (Notes 2,4, 35, 45, 47) 70,546,024 60,012,375 57,926,634
Domestic      
Disclosure of performance obligations [line items]      
Sales of goods 68,578,390 58,359,774 56,381,405
Sales related to rendering of services 370,799 252,216 223,075
Sales related to construction services 193,541 159,262 170,895
Total revenue from external customers (Notes 2,4, 35, 45, 47) 69,142,730 58,771,252 56,775,375
Domestic | Electricity      
Disclosure of performance obligations [line items]      
Sales of goods 66,198,964 57,308,555 55,731,782
Domestic | Heat Supply      
Disclosure of performance obligations [line items]      
Sales of goods 489,629 232,738 198,715
Domestic | Others      
Disclosure of performance obligations [line items]      
Sales of goods 1,889,797 818,481 450,908
Domestic | Performance obligations satisfied at point in time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 2,4, 35, 45, 47) 68,578,390 58,359,774 56,381,405
Domestic | Performance obligations satisfied over time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 2,4, 35, 45, 47) 564,340 411,478 393,970
Overseas      
Disclosure of performance obligations [line items]      
Sales of goods 606,079 441,203 303,704
Sales related to rendering of services 343,803 204,184 206,275
Sales related to construction services 453,412 595,736 641,280
Total revenue from external customers (Notes 2,4, 35, 45, 47) [1] 1,403,294 1,241,123 1,151,259
Overseas | Electricity      
Disclosure of performance obligations [line items]      
Sales of goods 0 0 0
Overseas | Heat Supply      
Disclosure of performance obligations [line items]      
Sales of goods 0 0 0
Overseas | Others      
Disclosure of performance obligations [line items]      
Sales of goods 606,079 441,203 303,704
Overseas | Performance obligations satisfied at point in time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 2,4, 35, 45, 47) 606,079 441,203 303,704
Overseas | Performance obligations satisfied over time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 2,4, 35, 45, 47) ₩ 797,215 ₩ 799,920 ₩ 847,555
[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.