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Property, Plant and Equipment (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Changes in property and equipment [Line Items]    
Beginning balance ₩ 150,882,414 ₩ 145,743,056
Acquisitions 12,266,870 12,535,958
Disposals (909,211) (824,993)
Depreciation (9,904,933) (9,658,863)
Impairment (710,162) [1] (51,067) [2]
Others 1,118,218 3,138,321
Ending balance 152,743,194 150,882,414
Land    
Changes in property and equipment [Line Items]    
Beginning balance 13,296,574 12,966,537
Ending balance 13,532,324 13,296,574
Land | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 13,318,542 12,969,741
Acquisitions 2,254 32,773
Disposals (18,240) (8,961)
Depreciation 0 0
Impairment 0 [1] 0 [2]
Others 251,736 324,989
Ending balance 13,554,292 13,318,542
Land | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 13,318,542 12,969,741
Ending balance 13,554,292 13,318,542
Land | Government grants    
Changes in property and equipment [Line Items]    
Beginning balance (21,968) (3,204)
Acquisitions 0 0
Disposals 0 5
Depreciation 0 0
Impairment 0 [1] 0 [2]
Others 0 (18,769)
Ending balance (21,968) (21,968)
Buildings    
Changes in property and equipment [Line Items]    
Beginning balance 11,989,987 11,723,436
Ending balance 11,870,502 11,989,987
Buildings | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 12,053,526 11,784,624
Acquisitions 10,156 40,592
Disposals (8,545) (19,715)
Depreciation (767,845) (794,804)
Impairment (1,896) [1] (923) [2]
Others 648,295 1,043,752
Ending balance 11,933,691 12,053,526
Buildings | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 18,777,678 17,722,326
Ending balance 19,431,536 18,777,678
Buildings | Accumulated depreciation    
Changes in property and equipment [Line Items]    
Beginning balance (6,722,376) (5,936,849)
Ending balance (7,494,176) (6,722,376)
Buildings | Accumulated impairment losses    
Changes in property and equipment [Line Items]    
Beginning balance (1,776) (853)
Ending balance (3,669) (1,776)
Buildings | Government grants    
Changes in property and equipment [Line Items]    
Beginning balance (63,539) (61,188)
Acquisitions (4,213) (900)
Disposals 31 28
Depreciation 6,836 5,996
Impairment [1] 0  
Others (2,304) (7,475)
Ending balance (63,189) (63,539)
Structures    
Changes in property and equipment [Line Items]    
Beginning balance 43,908,364 43,132,774
Ending balance 42,520,941 43,908,364
Structures | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 44,104,778 43,330,415
Acquisitions 11,123 428
Disposals (587,278) (519,366)
Depreciation (2,476,278) (2,421,168)
Impairment (360) [1] (6,856) [2]
Others 1,659,810 3,721,325
Ending balance 42,711,795 44,104,778
Structures | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 66,184,484 63,291,437
Ending balance 66,335,506 66,184,484
Structures | Accumulated depreciation    
Changes in property and equipment [Line Items]    
Beginning balance (22,071,667) (19,959,839)
Ending balance (23,615,312) (22,071,667)
Structures | Accumulated impairment losses    
Changes in property and equipment [Line Items]    
Beginning balance (8,039) (1,183)
Ending balance (8,339) (8,039)
Structures | Government grants    
Changes in property and equipment [Line Items]    
Beginning balance (196,414) (197,641)
Acquisitions 0 0
Disposals 3,270 1,905
Depreciation 10,292 10,011
Impairment 0 [1] 0 [2]
Others (8,002) (10,689)
Ending balance (190,854) (196,414)
Machinery    
Changes in property and equipment [Line Items]    
Beginning balance 46,692,610 43,310,881
Ending balance 47,283,353 46,692,610
Machinery | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 46,875,798 43,421,945
Acquisitions 460,676 [3] 421,892
Disposals (250,159) [3] (242,428)
Depreciation (4,973,252) [3] (4,821,595)
Impairment (393,839) [1],[3] (43,121) [2]
Others 5,737,371 [3] 8,139,105
Ending balance 47,456,595 [3] 46,875,798
Machinery | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 75,826,292 67,769,168
Ending balance 82,047,823 75,826,292
Machinery | Accumulated depreciation    
Changes in property and equipment [Line Items]    
Beginning balance (28,904,982) (24,344,832)
Ending balance (34,151,878) (28,904,982)
Machinery | Accumulated impairment losses    
Changes in property and equipment [Line Items]    
Beginning balance (45,512) (2,391)
Ending balance (439,350) (45,512)
Machinery | Government grants    
Changes in property and equipment [Line Items]    
Beginning balance (183,188) (111,064)
Acquisitions (1,185) (10,834)
Disposals 823 489
Depreciation 18,099 17,390
Impairment 0 [1] 0 [2]
Others (7,791) (79,169)
Ending balance (173,242) (183,188)
Ships    
Changes in property and equipment [Line Items]    
Beginning balance 403 550
Ending balance 302 403
Ships | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 403 550
Acquisitions 0 0
Disposals 0 0
Depreciation (103) (147)
Impairment 0 [1] 0 [2]
Others 2 0
Ending balance 302 403
Ships | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 4,175 4,175
Ending balance 3,655 4,175
Ships | Accumulated depreciation    
Changes in property and equipment [Line Items]    
Beginning balance (3,772) (3,625)
Ending balance (3,353) (3,772)
Vehicles    
Changes in property and equipment [Line Items]    
Beginning balance 74,716 70,863
Ending balance 67,969 74,716
Vehicles | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 81,038 70,970
Acquisitions 2,774 3,447
Disposals (402) (174)
Depreciation (32,620) (34,236)
Impairment 0 [1] (127) [2]
Others 21,399 41,158
Ending balance 72,189 81,038
Vehicles | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 276,425 247,751
Ending balance 287,954 276,425
Vehicles | Accumulated depreciation    
Changes in property and equipment [Line Items]    
Beginning balance (195,260) (176,781)
Ending balance (215,649) (195,260)
Vehicles | Accumulated impairment losses    
Changes in property and equipment [Line Items]    
Beginning balance (127)  
Ending balance (116) (127)
Vehicles | Government grants    
Changes in property and equipment [Line Items]    
Beginning balance (6,322) (107)
Acquisitions (45) (107)
Disposals 0 14
Depreciation 2,146 1,070
Impairment 0 [1] 0 [2]
Others 1 (7,192)
Ending balance (4,220) (6,322)
Equipment    
Changes in property and equipment [Line Items]    
Beginning balance 419,911 375,663
Ending balance 382,441 419,911
Equipment | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 420,672 376,395
Acquisitions 36,884 53,529
Disposals (265) (413)
Depreciation (187,821) (158,614)
Impairment (36) [1] (6) [2]
Others 113,425 149,781
Ending balance 382,859 420,672
Equipment | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 1,440,870 1,270,660
Ending balance 1,558,309 1,440,870
Equipment | Accumulated depreciation    
Changes in property and equipment [Line Items]    
Beginning balance (1,020,192) (894,265)
Ending balance (1,175,408) (1,020,192)
Equipment | Accumulated impairment losses    
Changes in property and equipment [Line Items]    
Beginning balance (6)  
Ending balance (42) (6)
Equipment | Government grants    
Changes in property and equipment [Line Items]    
Beginning balance (761) (732)
Acquisitions (22) (43)
Disposals 0 0
Depreciation 365 454
Impairment 0 [1] 0 [2]
Others 0 (440)
Ending balance (418) (761)
Tools    
Changes in property and equipment [Line Items]    
Beginning balance 199,636 178,602
Ending balance 192,000 199,636
Tools | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 200,663 179,032
Acquisitions 12,331 30,990
Disposals (268) (166)
Depreciation (83,283) (74,909)
Impairment (6) [1] (32) [2]
Others 63,238 0
Ending balance 192,675 200,663
Tools | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 1,010,537 921,115
Ending balance 1,073,145 1,010,537
Tools | Accumulated depreciation    
Changes in property and equipment [Line Items]    
Beginning balance (809,842) (742,083)
Ending balance (880,432) (809,842)
Tools | Accumulated impairment losses    
Changes in property and equipment [Line Items]    
Beginning balance (32)  
Ending balance (38) (32)
Tools | Government grants    
Changes in property and equipment [Line Items]    
Beginning balance (1,027) (430)
Acquisitions (44) 0
Disposals 0 0
Depreciation 432 354
Impairment 0 [1] 0 [2]
Others (36) (951)
Ending balance (675) (1,027)
Construction in progress    
Changes in property and equipment [Line Items]    
Beginning balance 25,523,457 27,160,453
Ending balance 28,766,427 25,523,457
Construction in progress | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 25,572,541 27,296,260
Acquisitions 11,749,397 11,996,508
Disposals (47,463) (6,487)
Depreciation 0 0
Impairment (167,603) [1] 0 [2]
Others (8,285,705) (13,713,740)
Ending balance 28,821,167 25,572,541
Construction in progress | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 25,610,649 27,334,368
Ending balance 29,026,880 25,610,649
Construction in progress | Accumulated impairment losses    
Changes in property and equipment [Line Items]    
Beginning balance (38,108) (38,108)
Ending balance (205,713) (38,108)
Construction in progress | Government grants    
Changes in property and equipment [Line Items]    
Beginning balance (49,084) (135,807)
Acquisitions (23,895) (42,728)
Disposals 0 0
Depreciation 0 0
Impairment 0 [1] 0 [2]
Others 18,239 129,451
Ending balance (54,740) (49,084)
Finance lease assets    
Changes in property and equipment [Line Items]    
Beginning balance 297,652 406,353
Ending balance 195,704 297,652
Finance lease assets | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 297,679 406,353
Acquisitions 0 0
Disposals 0 (29,696)
Depreciation (101,888) (107,390)
Impairment 0 [1] 0 [2]
Others (61) 28,412
Ending balance 195,730 297,679
Finance lease assets | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 2,390,680 2,390,779
Ending balance 2,390,701 2,390,680
Finance lease assets | Accumulated depreciation    
Changes in property and equipment [Line Items]    
Beginning balance (2,093,001) (1,984,426)
Ending balance (2,194,971) (2,093,001)
Finance lease assets | Government grants    
Changes in property and equipment [Line Items]    
Beginning balance (27)  
Acquisitions 0 0
Disposals 0 0
Depreciation 1 1
Impairment 0 [1] 0 [2]
Others 0 (28)
Ending balance (26) (27)
Retirements, property, plant and equipment    
Changes in property and equipment [Line Items]    
Beginning balance 6,039,484 4,065,412
Ending balance 5,571,754 6,039,484
Retirements, property, plant and equipment | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 6,039,484 4,065,412
Acquisitions 1,988  
Disposals 0  
Depreciation (610,435) (518,565)
Impairment [1] (146,424)  
Others 287,141 2,492,637
Ending balance 5,571,754 6,039,484
Retirements, property, plant and equipment | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 9,395,821 7,129,771
Ending balance 9,424,181 9,395,821
Retirements, property, plant and equipment | Accumulated depreciation    
Changes in property and equipment [Line Items]    
Beginning balance (3,356,337) (3,064,359)
Ending balance (3,706,004) (3,356,337)
Other property, plant and equipment    
Changes in property and equipment [Line Items]    
Beginning balance 2,439,620 2,351,532
Ending balance 2,359,477 2,439,620
Other property, plant and equipment | Carrying Amount Other than Government Grants [Member]    
Changes in property and equipment [Line Items]    
Beginning balance 2,439,620 2,351,532
Acquisitions 8,691 10,411
Disposals (715) (28)
Depreciation (709,579) (762,711)
Impairment 0 [1] 0 [2]
Others 621,460 840,416
Ending balance 2,359,477 2,439,620
Other property, plant and equipment | Acquisition cost    
Changes in property and equipment [Line Items]    
Beginning balance 11,247,021 10,361,294
Ending balance 11,875,394 11,247,021
Other property, plant and equipment | Accumulated depreciation    
Changes in property and equipment [Line Items]    
Beginning balance (8,807,401) (8,009,762)
Ending balance ₩ (9,515,917) ₩ (8,807,401)
[1] Korea Hydro & Nuclear Power Co., Ltd. and Korea Western Power Co., Ltd., 100% owned subsidiaries, have determined that there are impairment indicators for the shutdowns of certain power generation units and fire, and performed an impairment test over the individual assets. As a result, the Company recognized the amount of the carrying amount in excess of its recoverable amount as impairment loss in the consolidated statements of comprehensive income. The amount includes impairment loss of KRW703,133 million in relation to Wolsong unit 1, and Shin-Hanul unit 3 and 4 as described in note 2, and the loss of KRW7,031 million due to fire at Taean unit 2.
[2] Korea Midland Power Co., Ltd. and Korea Western Power Co., Ltd., 100% owned subsidiaries, have determined that there are impairment indicators for the shutdowns of certain power generation units and fire, and performed an impairment test over the individual assets. As a result, the Company recognized the amount of the carrying amount in excess of its recoverable amount as impairment loss in the consolidated statements of comprehensive income.
[3] As described in note 29, the amount of acquisition of machinery includes KRW204,787 million of that the Company believes 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.