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Sales - Summary of Sales (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) ₩ 91,018,712 ₩ 85,940,137 ₩ 69,184,469
Sales related to rendering of services 710,445 750,878 714,602
Sales related to construction services 849,108 785,395 646,953
Total revenue from external customers (Notes 4, 35, 45, 47) 92,578,265 87,476,410 70,546,024
Domestic      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 90,659,090 85,588,151 68,578,390
Sales related to rendering of services 482,251 467,661 370,799
Sales related to construction services 145,496 186,996 193,541
Total revenue from external customers (Notes 4, 35, 45, 47) 91,286,837 86,242,808 69,142,730
Domestic | Electricity      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 88,889,764 82,954,778 66,198,964
Domestic | Heat Supply      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 363,154 440,435 489,629
Domestic | Others      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 1,406,172 2,192,938 1,889,797
Domestic | Performance obligations satisfied at point in time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) 90,659,090 85,588,151 68,578,390
Domestic | Performance obligations satisfied over time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) 627,747 654,657 564,340
Overseas      
Disclosure of performance obligations [line items]      
Sales of goods (Note 2) 359,622 351,986 606,079
Sales related to rendering of services 228,194 283,217 343,803
Sales related to construction services 703,612 598,399 453,412
Total revenue from external customers (Notes 4, 35, 45, 47) [1] 1,291,428 1,233,602 1,403,294
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) 359,622 351,986 606,079
Overseas | Performance obligations satisfied at point in time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) 359,622 351,986 606,079
Overseas | Performance obligations satisfied over time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) ₩ 931,806 ₩ 881,616 ₩ 797,215
[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.