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Provisions (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [Line Items]    
Net carrying value ₩ 18,180,546 ₩ 18,362,212
Reconciliation of changes in other provisions    
Beginning balance 18,180,546 18,362,212
Changes in other provisions    
Increase in provision 5,619,551 2,783,241
Payment (2,053,071) (2,866,381)
Reversal of unused amount (86,804) (112,453)
Others 10,547 13,927
Ending balance 21,670,769 18,180,546
Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 1,594,798 2,137,498
Reconciliation of changes in other provisions    
Beginning balance 1,594,798 2,137,498
Changes in other provisions    
Ending balance 2,604,721 1,594,798
Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 16,585,748 16,224,714
Reconciliation of changes in other provisions    
Beginning balance 16,585,748 16,224,714
Changes in other provisions    
Ending balance 19,066,048 16,585,748
Provisions for employment benefits    
Disclosure of other provisions [Line Items]    
Net carrying value 976,347 913,787
Reconciliation of changes in other provisions    
Beginning balance 976,347 913,787
Changes in other provisions    
Increase in provision 900,033 912,440
Payment (879,980) (843,281)
Reversal of unused amount (20,781) (6,599)
Others 0 0
Ending balance 975,619 976,347
Provisions for employment benefits | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 976,347 913,787
Reconciliation of changes in other provisions    
Beginning balance 976,347 913,787
Changes in other provisions    
Ending balance 975,619 976,347
Litigation provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 77,793 [1] 73,576
Reconciliation of changes in other provisions    
Beginning balance 77,793 [1] 73,576
Changes in other provisions    
Increase in provision 59,366 234,517 [1]
Payment (17,236) (216,187) [1]
Reversal of unused amount (31,525) (13,847) [1]
Others 0 (266) [1]
Ending balance 88,398 77,793 [1]
Litigation provisions | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 40,157 48,621
Reconciliation of changes in other provisions    
Beginning balance 40,157 48,621
Changes in other provisions    
Ending balance 39,177 40,157
Litigation provisions | Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 37,636 24,955
Reconciliation of changes in other provisions    
Beginning balance 37,636 24,955
Changes in other provisions    
Ending balance 49,221 37,636
Provisions For Nuclear Plants Restoration    
Disclosure of other provisions [Line Items]    
Net carrying value 15,994,039 13,007,228
Reconciliation of changes in other provisions    
Beginning balance 13,388,134 13,007,228
Changes in other provisions    
Increase in provision 2,639,562 411,316
Payment (33,657) (30,410)
Reversal of unused amount 0 0
Others 0 0
Ending balance 15,994,039 13,388,134
Provisions For Nuclear Plants Restoration | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 0 0
Reconciliation of changes in other provisions    
Beginning balance 0 0
Changes in other provisions    
Ending balance 0 0
Provisions For Nuclear Plants Restoration | Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 13,388,134 13,007,228
Reconciliation of changes in other provisions    
Beginning balance 13,388,134 13,007,228
Changes in other provisions    
Ending balance 15,994,039 13,388,134
Spent fuel recovery provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 1,291,354 1,339,046
Reconciliation of changes in other provisions    
Beginning balance 1,291,354 1,339,046
Changes in other provisions    
Increase in provision 440,029 435,007
Payment (376,103) (482,699)
Reversal of unused amount 0 0
Others 0 0
Ending balance 1,355,280 1,291,354
Spent fuel recovery provisions | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 0 0
Reconciliation of changes in other provisions    
Beginning balance 0  
Changes in other provisions    
Ending balance 401,741 0
Spent fuel recovery provisions | Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 1,291,354 1,339,046
Reconciliation of changes in other provisions    
Beginning balance 1,291,354 1,339,046
Changes in other provisions    
Ending balance 953,539 1,291,354
Radioactive waste recovery provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 1,685,008 1,638,371
Reconciliation of changes in other provisions    
Beginning balance 1,685,008 1,638,371
Changes in other provisions    
Increase in provision 209,551 112,815
Payment (6,787) (66,178)
Reversal of unused amount 0 0
Others 310 0
Ending balance 1,888,082 1,685,008
Radioactive waste recovery provisions | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 4,310 11,494
Reconciliation of changes in other provisions    
Beginning balance 4,310 11,494
Changes in other provisions    
Ending balance 77,053 4,310
Radioactive waste recovery provisions | Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 1,680,698 1,626,877
Reconciliation of changes in other provisions    
Beginning balance 1,680,698 1,626,877
Changes in other provisions    
Ending balance 1,811,029 1,680,698
PCBs recovery provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 147,668 180,087
Reconciliation of changes in other provisions    
Beginning balance 147,668 180,087
Changes in other provisions    
Increase in provision 14,251 4,600
Payment (8,938) (13,758)
Reversal of unused amount 0 (23,261)
Others 0 0
Ending balance 152,981 147,668
PCBs recovery provisions | Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 147,668 180,087
Reconciliation of changes in other provisions    
Beginning balance 147,668 180,087
Changes in other provisions    
Ending balance 152,981 147,668
Other recovery provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 10,477 6,659
Reconciliation of changes in other provisions    
Beginning balance 10,477 6,659
Changes in other provisions    
Increase in provision 2,020 2,125
Payment (2,033) 0
Reversal of unused amount   0
Others 309 1,693
Ending balance 10,773 10,477
Other recovery provisions | Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 10,477 6,659
Reconciliation of changes in other provisions    
Beginning balance 10,477 6,659
Changes in other provisions    
Ending balance 10,773 10,477
Power plant regional support program provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 137,668 153,756
Reconciliation of changes in other provisions    
Beginning balance 137,668 153,756
Changes in other provisions    
Increase in provision 41,341 46,366
Payment (48,390) (71,978)
Reversal of unused amount   0
Others 9,514 9,524
Ending balance 140,133 137,668
Power plant regional support program provisions | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 137,668 153,756
Reconciliation of changes in other provisions    
Beginning balance 137,668 153,756
Changes in other provisions    
Ending balance 140,133 137,668
Transmission regional support program provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 151,698 243,365
Reconciliation of changes in other provisions    
Beginning balance 151,698 243,365
Changes in other provisions    
Increase in provision 169,616 141,661
Payment (181,529) (233,328)
Reversal of unused amount 0 0
Others 0 0
Ending balance 139,785 151,698
Transmission regional support program provisions | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 151,698 243,365
Reconciliation of changes in other provisions    
Beginning balance 151,698 243,365
Changes in other provisions    
Ending balance 139,785 151,698
Provisions for tax    
Disclosure of other provisions [Line Items]    
Net carrying value 6,845 61
Reconciliation of changes in other provisions    
Beginning balance 6,845 61
Changes in other provisions    
Increase in provision   6,821
Payment   0
Reversal of unused amount (6,847) 0
Others 2 (37)
Ending balance 0 6,845
Provisions for tax | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 6,845 61
Reconciliation of changes in other provisions    
Beginning balance 6,845 61
Changes in other provisions    
Ending balance 0 6,845
Provisions for tax | Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 0 0
Reconciliation of changes in other provisions    
Beginning balance 0 0
Changes in other provisions    
Ending balance 0 0
Provisions for financial guarantee    
Disclosure of other provisions [Line Items]    
Net carrying value 15,586 23,475
Reconciliation of changes in other provisions    
Beginning balance 15,586 23,475
Changes in other provisions    
Increase in provision 83,910 1,179
Payment (16,589) (67)
Reversal of unused amount (1,551) (8,432)
Others 1 (569)
Ending balance 81,357 15,586
Provisions for financial guarantee | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 1,320 0
Reconciliation of changes in other provisions    
Beginning balance 1,320 0
Changes in other provisions    
Ending balance 111 1,320
Provisions for financial guarantee | Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 14,266 23,475
Reconciliation of changes in other provisions    
Beginning balance 14,266 23,475
Changes in other provisions    
Ending balance 81,246 14,266
Provisions for RPS    
Disclosure of other provisions [Line Items]    
Net carrying value 93,919 271,624
Reconciliation of changes in other provisions    
Beginning balance 93,919 271,624
Changes in other provisions    
Increase in provision 222,119 297,802
Payment (313,149) (475,507)
Reversal of unused amount 0 0
Others 0 0
Ending balance 2,889 93,919
Provisions for RPS | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 93,919 271,624
Reconciliation of changes in other provisions    
Beginning balance 93,919 271,624
Changes in other provisions    
Ending balance 2,889 93,919
Provisions for greenhouse gas emissions obligations    
Disclosure of other provisions [Line Items]    
Net carrying value 136,187 414,252
Reconciliation of changes in other provisions    
Beginning balance 136,187 414,252
Changes in other provisions    
Increase in provision 724,002 131,860
Payment (152,463) (350,356)
Reversal of unused amount (25,267) (59,569)
Others 0 0
Ending balance 682,459 136,187
Provisions for greenhouse gas emissions obligations | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 136,187 414,252
Reconciliation of changes in other provisions    
Beginning balance 136,187 414,252
Changes in other provisions    
Ending balance 682,459 136,187
Others    
Disclosure of other provisions [Line Items]    
Net carrying value 61,862 96,925
Reconciliation of changes in other provisions    
Beginning balance 61,862 96,925
Changes in other provisions    
Increase in provision 113,751 44,732
Payment (16,217) (82,632)
Reversal of unused amount (833) (745)
Others 411 3,582
Ending balance 158,974 61,862
Others | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 46,347 80,538
Reconciliation of changes in other provisions    
Beginning balance 46,347 80,538
Changes in other provisions    
Ending balance   46,347
Others | Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 15,515 16,387
Reconciliation of changes in other provisions    
Beginning balance ₩ 15,515 16,387
Changes in other provisions    
Ending balance   ₩ 15,515
[1] As described in Note 50.(1), the Company believes that the possibility of economic benefit outflow is probable on the request for additional construction costs of Hyundai E&C, GS Engineering & Construction Corp. and Hansol SeenTec Co., Ltd. For this reason, the Company recognized W204,787 million of provision in addition to property, plant and equipment.