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Sales - Summary of Sales (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of performance obligations [line items]      
Sales of goods ₩ 58,702,209 ₩ 56,684,312 ₩ 56,894,876
Sales related to rendering of services 456,400 429,350 408,290
Sales of construction services 754,998 812,175 1,264,916
Total revenue from external customers (Notes 4, 35, 45, 47) 59,913,607 57,925,837 58,568,082
Domestic      
Disclosure of performance obligations [line items]      
Sales of goods 58,261,006 56,380,608 56,609,330
Sales related to rendering of services 252,216 223,075 222,106
Sales of construction services 159,262 170,895 110,692
Total revenue from external customers (Notes 4, 35, 45, 47) 58,672,484 56,774,578 56,942,128
Domestic | Electricity      
Disclosure of performance obligations [line items]      
Sales of goods 57,210,231 55,730,985 55,939,001
Domestic | Heat Supply      
Disclosure of performance obligations [line items]      
Sales of goods 232,294 198,715 220,948
Domestic | Others      
Disclosure of performance obligations [line items]      
Sales of goods 818,481 450,908 449,381
Domestic | Performance obligations satisfied at point in time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) 58,261,006 56,380,608 56,609,330
Domestic | Performance obligations satisfied over time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) 411,478 393,970 332,798
Overseas      
Disclosure of performance obligations [line items]      
Sales of goods 441,203 303,704 285,546
Sales related to rendering of services 204,184 206,275 186,184
Sales of construction services 595,736 641,280 1,154,224
Total revenue from external customers (Notes 4, 35, 45, 47) [1] 1,241,123 1,151,259 1,625,954
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 441,203 303,704 285,546
Overseas | Performance obligations satisfied at point in time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) 441,203 303,704 285,546
Overseas | Performance obligations satisfied over time      
Disclosure of performance obligations [line items]      
Total revenue from external customers (Notes 4, 35, 45, 47) ₩ 799,920 ₩ 847,555 ₩ 1,340,408
[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.