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Provisions (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [Line Items]    
Net carrying value ₩ 18,180,546 ₩ 18,362,212
Reconciliation of changes in other provisions    
Beginning balance 18,362,212 15,427,139
Changes in other provisions    
Increase in provision 2,783,241 5,292,348
Payment (2,866,381) (2,395,506)
Reversal of unused amount (112,453) (49,115)
Others 13,927 87,346
Ending balance 18,180,546 18,362,212
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 2,137,498 1,999,988
Changes in other provisions    
Ending balance 1,594,798 2,137,498
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 16,224,714 13,427,151
Changes in other provisions    
Ending balance 16,585,748 16,224,714
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 913,787 810,607
Changes in other provisions    
Increase in provision 912,440 984,896
Payment (843,281) (880,255)
Reversal of unused amount (6,599) (1,461)
Others 0 0
Ending balance 976,347 913,787
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 913,787 810,607
Changes in other provisions    
Ending balance 976,347 913,787
Litigation provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 77,793 [1] 73,576
Reconciliation of changes in other provisions    
Beginning balance 73,576 198,237
Changes in other provisions    
Increase in provision 234,517 [1] 34,629
Payment (216,187) [1] (152,461)
Reversal of unused amount (13,847) [1] (7,096)
Others (266) [1] 267
Ending balance 77,793 [1] 73,576
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 48,621 79,359
Changes in other provisions    
Ending balance 40,157 48,621
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 24,955 118,878
Changes in other provisions    
Ending balance 37,636 24,955
Provisions For Nuclear Plants Restoration    
Disclosure of other provisions [Line Items]    
Net carrying value 13,388,134 13,007,228
Reconciliation of changes in other provisions    
Beginning balance 13,007,228 10,195,928
Changes in other provisions    
Increase in provision 411,316 2,818,033
Payment (30,410) (6,733)
Reversal of unused amount 0 0
Others 0 0
Ending balance 13,388,134 13,007,228
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 13,007,228 10,195,928
Changes in other provisions    
Ending balance 13,388,134 13,007,228
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 1,339,046 1,374,225
Changes in other provisions    
Increase in provision 435,007 307,682
Payment (482,699) (342,861)
Reversal of unused amount 0 0
Others 0 0
Ending balance 1,291,354 1,339,046
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 1,339,046 1,374,225
Changes in other provisions    
Ending balance 1,291,354 1,339,046
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 1,638,371 1,479,502
Changes in other provisions    
Increase in provision 112,815 222,632
Payment (66,178) (63,763)
Reversal of unused amount 0 0
Others 0 0
Ending balance 1,685,008 1,638,371
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 11,494 2,566
Changes in other provisions    
Ending balance 4,310 11,494
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 1,626,877 1,476,936
Changes in other provisions    
Ending balance 1,680,698 1,626,877
PCBs recovery provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 147,668 180,087
Reconciliation of changes in other provisions    
Beginning balance 180,087 191,744
Changes in other provisions    
Increase in provision 4,600 5,309
Payment (13,758) (14,266)
Reversal of unused amount (23,261) (2,700)
Others 0 0
Ending balance 147,668 180,087
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 180,087 191,744
Changes in other provisions    
Ending balance 147,668 180,087
Other recovery provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 10,477 6,659
Reconciliation of changes in other provisions    
Beginning balance 6,659 507
Changes in other provisions    
Increase in provision 2,125 5,939
Payment 0 0
Reversal of unused amount 0 0
Others 1,693 213
Ending balance 10,477 6,659
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 6,659 507
Changes in other provisions    
Ending balance 10,477 6,659
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 153,756 152,851
Changes in other provisions    
Increase in provision 46,366 94,039
Payment (71,978) (103,889)
Reversal of unused amount 0 0
Others 9,524 10,755
Ending balance 137,668 153,756
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 153,756 152,851
Changes in other provisions    
Ending balance 137,668 153,756
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 243,365 282,608
Changes in other provisions    
Increase in provision 141,661 143,178
Payment (233,328) (182,421)
Reversal of unused amount 0 0
Others 0 0
Ending balance 151,698 243,365
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 243,365 282,608
Changes in other provisions    
Ending balance 151,698 243,365
Provisions for tax    
Disclosure of other provisions [Line Items]    
Net carrying value 6,845 61
Reconciliation of changes in other provisions    
Beginning balance 61 242
Changes in other provisions    
Increase in provision 6,821 0
Payment 0 (25)
Reversal of unused amount 0 (136)
Others (37) (20)
Ending balance 6,845 61
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 61 106
Changes in other provisions    
Ending balance 6,845 61
Provisions for tax | Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 0 0
Reconciliation of changes in other provisions    
Beginning balance 0 136
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 23,475 29,665
Changes in other provisions    
Increase in provision 1,179 3,760
Payment (67) 0
Reversal of unused amount (8,432) (9,945)
Others (569) (5)
Ending balance 15,586 23,475
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 0 29,207
Changes in other provisions    
Ending balance 1,320 0
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 23,475 458
Changes in other provisions    
Ending balance 14,266 23,475
Provisions for RPS    
Disclosure of other provisions [Line Items]    
Net carrying value 93,919 271,624
Reconciliation of changes in other provisions    
Beginning balance 271,624 417,404
Changes in other provisions    
Increase in provision 297,802 242,946
Payment (475,507) (388,726)
Reversal of unused amount 0 0
Others 0 0
Ending balance 93,919 271,624
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 271,624 417,404
Changes in other provisions    
Ending balance 93,919 271,624
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 414,252 249,644
Changes in other provisions    
Increase in provision 131,860 422,666
Payment (350,356) (256,758)
Reversal of unused amount (59,569) (1,300)
Others 0 0
Ending balance 136,187 414,252
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 414,252 249,644
Changes in other provisions    
Ending balance 136,187 414,252
Others    
Disclosure of other provisions [Line Items]    
Net carrying value 61,862 96,925 [2]
Reconciliation of changes in other provisions    
Beginning balance 96,925 [2] 43,975
Changes in other provisions    
Increase in provision 44,732 6,639 [2]
Payment (82,632) (3,348) [2]
Reversal of unused amount (745) (26,477) [2]
Others 3,582 76,136 [2]
Ending balance 61,862 96,925 [2]
Others | Current Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 46,347 80,538
Reconciliation of changes in other provisions    
Beginning balance 80,538 4,385
Changes in other provisions    
Ending balance 46,347 80,538
Others | Noncurrent Provisions    
Disclosure of other provisions [Line Items]    
Net carrying value 15,515 16,387
Reconciliation of changes in other provisions    
Beginning balance 16,387 39,590
Changes in other provisions    
Ending balance ₩ 15,515 ₩ 16,387
[1] As described in note 53.(1), the Company believes that the possibility of economic 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 KRW204,787 million of provision as addition to property, plant and equipment.
[2] The Company believes that the possibility of economic outflow is probable on the cost of construction suspension of Shin-Kori unit 5 and 6 for three months. For this reason, the Company recognized KRW77,261 million of provision as addition to construction-in-progress.