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Provisions (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [Line Items]    
Net carrying value ₩ 15,427,139 ₩ 14,443,930
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 15,427,139 14,443,930
Changes in other provisions [Abstract]    
Increase in provision 5,292,348 3,325,450
Payment (2,395,506) (2,478,788)
Reversal of unused amount (49,115) (99,591)
Others 87,346 236,138
Ending balance 18,362,212 15,427,139
Current Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 2,137,498 1,999,988
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 1,999,988  
Changes in other provisions [Abstract]    
Ending balance 2,137,498 1,999,988
Noncurrent Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 16,224,714 13,427,151
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 13,427,151  
Changes in other provisions [Abstract]    
Ending balance 16,224,714 13,427,151
Provisions for employment benefits [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 810,607 718,365
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 810,607 718,365
Changes in other provisions [Abstract]    
Increase in provision 984,896 1,047,342
Payment (880,255) (947,982)
Reversal of unused amount (1,461) (7,108)
Others   (10)
Ending balance 913,787 810,607
Provisions for employment benefits [Member] | Current Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 810,607 810,607
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 810,607  
Changes in other provisions [Abstract]    
Ending balance 913,787 810,607
Litigation provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 198,237 167,965
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 198,237 167,965
Changes in other provisions [Abstract]    
Increase in provision 34,629 124,931
Payment (152,461) (294,403)
Reversal of unused amount (7,096) (20,736)
Others 267 220,480
Ending balance 73,576 198,237
Litigation provisions [Member] | Current Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 79,359 79,359
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 79,359  
Changes in other provisions [Abstract]    
Ending balance 48,621 79,359
Litigation provisions [Member] | Noncurrent Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 118,878 118,878
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 118,878  
Changes in other provisions [Abstract]    
Ending balance 24,955 118,878
Provisions For Nuclear Plants Restoration [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 10,195,928 9,684,286
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 10,195,928 9,684,286
Changes in other provisions [Abstract]    
Increase in provision 2,818,033 513,383
Payment (6,733) (1,741)
Ending balance 13,007,228 10,195,928
Provisions For Nuclear Plants Restoration [Member] | Noncurrent Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 10,195,928 10,195,928
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 10,195,928  
Changes in other provisions [Abstract]    
Ending balance 13,007,228 10,195,928
Spent fuel recovery provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 1,374,225 1,375,185
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 1,374,225 1,375,185
Changes in other provisions [Abstract]    
Increase in provision 307,682 469,982
Payment (342,861) (470,942)
Ending balance 1,339,046 1,374,225
Spent fuel recovery provisions [Member] | Noncurrent Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 1,374,225 1,374,225
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 1,374,225  
Changes in other provisions [Abstract]    
Ending balance 1,339,046 1,374,225
Waste recovery provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 1,479,502 1,502,140
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 1,479,502 1,502,140
Changes in other provisions [Abstract]    
Increase in provision 222,632 49,092
Payment (63,763) (71,998)
Others   268
Ending balance 1,638,371 1,479,502
Waste recovery provisions [Member] | Current Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 2,566 2,566
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 2,566  
Changes in other provisions [Abstract]    
Ending balance 11,494 2,566
Waste recovery provisions [Member] | Noncurrent Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 1,476,936 1,476,936
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 1,476,936  
Changes in other provisions [Abstract]    
Ending balance 1,626,877 1,476,936
PCBs recovery provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 191,744 182,400
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 191,744 182,400
Changes in other provisions [Abstract]    
Increase in provision 5,309 30,675
Payment (14,266) (21,331)
Reversal of unused amount (2,700)  
Ending balance 180,087 191,744
PCBs recovery provisions [Member] | Noncurrent Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 191,744 191,744
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 191,744  
Changes in other provisions [Abstract]    
Ending balance 180,087 191,744
Other recovery provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 507 862
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 507 862
Changes in other provisions [Abstract]    
Increase in provision 5,939  
Reversal of unused amount   (20)
Others 213 (335)
Ending balance 6,659 507
Other recovery provisions [Member] | Noncurrent Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 507 507
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 507  
Changes in other provisions [Abstract]    
Ending balance 6,659 507
Power plant regional support program provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 152,851 129,655
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 152,851 129,655
Changes in other provisions [Abstract]    
Increase in provision 94,039 50,252
Payment (103,889) (41,540)
Others 10,755 14,484
Ending balance 153,756 152,851
Power plant regional support program provisions [Member] | Current Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 153,756 152,851
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 152,851  
Changes in other provisions [Abstract]    
Ending balance 153,756 152,851
Transmission regional support program provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 282,608 228,785
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 282,608 228,785
Changes in other provisions [Abstract]    
Increase in provision 143,178 253,664
Payment (182,421) (199,841)
Ending balance 243,365 282,608
Transmission regional support program provisions [Member] | Current Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 243,365 282,608
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 282,608  
Changes in other provisions [Abstract]    
Ending balance 243,365 282,608
Provisions for tax [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 242 136
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 242 136
Changes in other provisions [Abstract]    
Increase in provision   125
Payment (25)  
Reversal of unused amount (136)  
Others (20) (19)
Ending balance 61 242
Provisions for tax [Member] | Current Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 61 106
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 106  
Changes in other provisions [Abstract]    
Ending balance 61 106
Provisions for tax [Member] | Noncurrent Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 0 136
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 136  
Changes in other provisions [Abstract]    
Ending balance 0 136
Provisions for financial guarantee [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 29,665 4,288
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 29,665 4,288
Changes in other provisions [Abstract]    
Increase in provision 3,760 29,741
Reversal of unused amount (9,945) (4,298)
Others (5) (66)
Ending balance 23,475 29,665
Provisions for financial guarantee [Member] | Current Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 23,475 458
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 458  
Changes in other provisions [Abstract]    
Ending balance 23,475 458
Provisions for financial guarantee [Member] | Noncurrent Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 0 29,207
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 29,207  
Changes in other provisions [Abstract]    
Ending balance 0 29,207
Provisions for RPS [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 417,404 363,178
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 417,404 363,178
Changes in other provisions [Abstract]    
Increase in provision 242,946 420,154
Payment (388,726) (309,975)
Reversal of unused amount   (55,953)
Ending balance 271,624 417,404
Provisions for RPS [Member] | Current Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 417,404 417,404
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 417,404  
Changes in other provisions [Abstract]    
Ending balance 271,624 417,404
Provisions for greenhouse gas emissions obligations [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 249,644 78,829
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 249,644 78,829
Changes in other provisions [Abstract]    
Increase in provision 422,666 298,618
Payment (256,758) (116,336)
Reversal of unused amount (1,300) (11,467)
Ending balance 414,252 249,644
Provisions for greenhouse gas emissions obligations [Member] | Current Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 249,644 249,644
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 249,644  
Changes in other provisions [Abstract]    
Ending balance 414,252 249,644
Others [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 43,975 [1] 7,856
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 43,975 [1] 7,856
Changes in other provisions [Abstract]    
Increase in provision 6,639 [1] 37,491
Payment (3,348) [1] (2,699)
Reversal of unused amount (26,477) [1] (9)
Others 76,136 [1] 1,336
Ending balance [1] 96,925 43,975
Others [Member] | Current Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 4,385 4,385
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 4,385  
Changes in other provisions [Abstract]    
Ending balance 80,538 4,385
Others [Member] | Noncurrent Provisions [Member]    
Disclosure of other provisions [Line Items]    
Net carrying value 39,590 39,590
Reconciliation of changes in other provisions [Abstract]    
Beginning balance 39,590  
Changes in other provisions [Abstract]    
Ending balance ₩ 16,387 ₩ 39,590
[1] As described in note 50.(1), 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 ￦77,261 million of provision as addition to construction-in-progress.