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Property, Plant and Equipment (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in property and equipment [Line Items]      
Beginning balance ₩ 152,743,194 ₩ 150,882,414  
Effect of change in accounting policy 4,947,947 0  
Acquisitions 14,221,355 12,266,870  
Disposals (964,308) (909,211)  
Depreciation (10,966,756) (9,904,933)  
Impairment (50,036) [1],[2] (710,164) [3] ₩ (51,067)
Others 4,770,431 [4],[5] 1,118,218  
Ending balance 164,701,827 152,743,194 150,882,414
Land      
Changes in property and equipment [Line Items]      
Beginning balance 13,532,324 13,296,574  
Effect of change in accounting policy 684,386    
Acquisitions 8,717    
Ending balance 13,826,246 13,532,324 13,296,574
Land | Carrying Amount Other than Government Grants [Member]      
Changes in property and equipment [Line Items]      
Beginning balance 13,554,292 13,318,542  
Effect of change in accounting policy 0 0  
Acquisitions 40,752 2,254  
Disposals (29,205) (18,240)  
Depreciation 0 0  
Impairment (25,626) [1],[2] 0 [3]  
Others 307,850 [4],[5] 251,736  
Ending balance 13,848,063 13,554,292 13,318,542
Land | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 13,554,292 13,318,542  
Ending balance 13,848,063 13,554,292 13,318,542
Land | Government grants      
Changes in property and equipment [Line Items]      
Beginning balance (21,968) (21,968)  
Effect of change in accounting policy 0 0  
Acquisitions 0 0  
Disposals 151 0  
Depreciation 0 0  
Impairment 0 [1],[2] 0 [3]  
Others 0 [4],[5] 0  
Ending balance (21,817) (21,968) (21,968)
Buildings      
Changes in property and equipment [Line Items]      
Beginning balance 11,870,502 11,870,502  
Effect of change in accounting policy 36,874    
Acquisitions 18,106    
Ending balance 12,383,786 11,870,502 11,870,502
Buildings | Carrying Amount Other than Government Grants [Member]      
Changes in property and equipment [Line Items]      
Beginning balance 11,933,691 12,053,526  
Effect of change in accounting policy 0 0  
Acquisitions 3,195 10,156  
Disposals (23,409) (8,545)  
Depreciation (821,680) (767,845)  
Impairment (1,293) [1],[2] (1,896) [3]  
Others 1,355,202 [4],[5] 648,295  
Ending balance 12,445,706 11,933,691 12,053,526
Buildings | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 19,431,536 18,777,678  
Ending balance 20,756,351 19,431,536 18,777,678
Buildings | Accumulated depreciation      
Changes in property and equipment [Line Items]      
Beginning balance (7,494,176) (6,722,376)  
Ending balance (8,305,683) (7,494,176) (6,722,376)
Buildings | Accumulated impairment losses      
Changes in property and equipment [Line Items]      
Beginning balance (3,669) (1,776)  
Ending balance (4,962) (3,669) (1,776)
Buildings | Government grants      
Changes in property and equipment [Line Items]      
Beginning balance (63,189) (63,539)  
Effect of change in accounting policy 0 0  
Acquisitions (592) (4,213)  
Disposals 0 31  
Depreciation 6,214 6,836  
Impairment 0 [1],[2] 0 [3]  
Others (4,353) [4],[5] (2,304)  
Ending balance (61,920) (63,189) (63,539)
Structures      
Changes in property and equipment [Line Items]      
Beginning balance 42,520,941 43,908,364  
Effect of change in accounting policy 20,840    
Acquisitions 7,358    
Ending balance 44,992,316 42,520,941 43,908,364
Structures | Carrying Amount Other than Government Grants [Member]      
Changes in property and equipment [Line Items]      
Beginning balance 42,711,795 44,104,778  
Effect of change in accounting policy 0 0  
Acquisitions 1,663 11,123  
Disposals (470,230) (587,278)  
Depreciation (2,399,283) (2,476,278)  
Impairment (1,234) [2] (360) [3]  
Others 5,336,159 [4],[5] 1,659,810  
Ending balance 45,178,870 42,711,795 44,104,778
Structures | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 66,335,506 66,184,484  
Ending balance 70,900,343 66,335,506 66,184,484
Structures | Accumulated depreciation      
Changes in property and equipment [Line Items]      
Beginning balance (23,615,312) (22,071,667)  
Ending balance (25,711,840) (23,615,312) (22,071,667)
Structures | Accumulated impairment losses      
Changes in property and equipment [Line Items]      
Beginning balance (8,339) (8,039)  
Ending balance (9,633) (8,339) (8,039)
Structures | Government grants      
Changes in property and equipment [Line Items]      
Beginning balance (190,854) (196,414)  
Effect of change in accounting policy 0 0  
Acquisitions 0 0  
Disposals 2,405 3,270  
Depreciation 9,373 10,292  
Impairment 0 [2] 0 [3]  
Others (7,478) [4],[5] (8,002)  
Ending balance (186,554) (190,854) (196,414)
Machinery      
Changes in property and equipment [Line Items]      
Beginning balance 47,283,353 46,692,610  
Effect of change in accounting policy 0    
Acquisitions 1,308    
Ending balance 49,748,393 47,283,353 46,692,610
Machinery | Carrying Amount Other than Government Grants [Member]      
Changes in property and equipment [Line Items]      
Beginning balance 47,456,595 [6] 46,875,798  
Effect of change in accounting policy 0 0 [6]  
Acquisitions 326,606 460,676 [6]  
Disposals (248,951) (250,159) [6]  
Depreciation (5,452,669) (4,973,252) [6]  
Impairment (12,247) [2] (393,839) [3],[6]  
Others 7,837,966 [4],[5] 5,737,371 [6]  
Ending balance 49,907,300 47,456,595 [6] 46,875,798
Machinery | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 82,047,823 75,826,292  
Ending balance 89,224,339 82,047,823 75,826,292
Machinery | Accumulated depreciation      
Changes in property and equipment [Line Items]      
Beginning balance (34,151,878) (28,904,982)  
Ending balance (38,865,392) (34,151,878) (28,904,982)
Machinery | Accumulated impairment losses      
Changes in property and equipment [Line Items]      
Beginning balance (439,350) (45,512)  
Ending balance (451,647) (439,350) (45,512)
Machinery | Government grants      
Changes in property and equipment [Line Items]      
Beginning balance (173,242) (183,188)  
Effect of change in accounting policy 0 0  
Acquisitions (1,050) (1,185)  
Disposals 635 823  
Depreciation 17,993 18,099  
Impairment 0 [2] 0 [3]  
Others (3,243) [4],[5] (7,791)  
Ending balance (158,907) (173,242) (183,188)
Ships      
Changes in property and equipment [Line Items]      
Beginning balance 302 403  
Effect of change in accounting policy 3,986,947    
Acquisitions 126,807    
Ending balance 201 302 403
Ships | Carrying Amount Other than Government Grants [Member]      
Changes in property and equipment [Line Items]      
Beginning balance 302 403  
Effect of change in accounting policy 0 0  
Acquisitions 0 0  
Disposals 0 0  
Depreciation (100) (103)  
Impairment 0 [2] 0 [3]  
Others (1) [5] 2  
Ending balance 201 302 403
Ships | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 3,655 4,175  
Ending balance 3,104 3,655 4,175
Ships | Accumulated depreciation      
Changes in property and equipment [Line Items]      
Beginning balance (3,353) (3,772)  
Ending balance (2,903) (3,353) (3,772)
Vehicles      
Changes in property and equipment [Line Items]      
Beginning balance 67,969 74,716  
Effect of change in accounting policy 11,258    
Acquisitions 9,559    
Ending balance 68,310 67,969 74,716
Vehicles | Carrying Amount Other than Government Grants [Member]      
Changes in property and equipment [Line Items]      
Beginning balance 72,189 81,038  
Effect of change in accounting policy 0 0  
Acquisitions 3,789 2,774  
Disposals 4,558 (402)  
Depreciation (33,650) (32,620)  
Impairment 0 [1],[2] 0 [3]  
Others 23,699 [5] 21,399  
Ending balance 70,585 72,189 81,038
Vehicles | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 287,954 276,425  
Ending balance 309,829 287,954 276,425
Vehicles | Accumulated depreciation      
Changes in property and equipment [Line Items]      
Beginning balance (215,649) (195,260)  
Ending balance (239,128) (215,649) (195,260)
Vehicles | Accumulated impairment losses      
Changes in property and equipment [Line Items]      
Beginning balance (116) (127)  
Ending balance (116) (116) (127)
Vehicles | Government grants      
Changes in property and equipment [Line Items]      
Beginning balance (4,220) (6,322)  
Effect of change in accounting policy 0 0  
Acquisitions (228) (45)  
Disposals 5 0  
Depreciation 2,170 2,146  
Impairment 0 [1],[2] 0 [3]  
Others (2) [5] 1  
Ending balance (2,275) (4,220) (6,322)
Equipment      
Changes in property and equipment [Line Items]      
Beginning balance 382,441 419,911  
Ending balance 373,874 382,441 419,911
Equipment | Carrying Amount Other than Government Grants [Member]      
Changes in property and equipment [Line Items]      
Beginning balance 382,859 420,672  
Effect of change in accounting policy 0 0  
Acquisitions 47,532 36,884  
Disposals (162) (265)  
Depreciation (199,376) (187,821)  
Impairment (227) [1],[2] (36) [3]  
Others 143,489 [4],[5] 113,425  
Ending balance 374,115 382,859 420,672
Equipment | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 1,558,309 1,440,870  
Ending balance 1,716,210 1,558,309 1,440,870
Equipment | Accumulated depreciation      
Changes in property and equipment [Line Items]      
Beginning balance (1,175,408) (1,020,192)  
Ending balance (1,342,053) (1,175,408) (1,020,192)
Equipment | Accumulated impairment losses      
Changes in property and equipment [Line Items]      
Beginning balance (42) (6)  
Ending balance (42) (42) (6)
Equipment | Government grants      
Changes in property and equipment [Line Items]      
Beginning balance (418) (761)  
Effect of change in accounting policy 0 0  
Acquisitions (81) (22)  
Disposals 0 0  
Depreciation 262 365  
Impairment 0 [1],[2] 0 [3]  
Others (4) [4],[5] 0  
Ending balance (241) (418) (761)
Tools      
Changes in property and equipment [Line Items]      
Beginning balance 192,000 199,636  
Ending balance 163,661 192,000 199,636
Tools | Carrying Amount Other than Government Grants [Member]      
Changes in property and equipment [Line Items]      
Beginning balance 192,675 200,663  
Effect of change in accounting policy 0 0  
Acquisitions 20,956 12,331  
Disposals (31) (268)  
Depreciation (87,708) (83,283)  
Impairment 0 [1],[2] (6) [3]  
Others 38,172 [4],[5] 63,238  
Ending balance 164,064 192,675 200,663
Tools | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 1,073,145 1,010,537  
Ending balance 1,098,127 1,073,145 1,010,537
Tools | Accumulated depreciation      
Changes in property and equipment [Line Items]      
Beginning balance (880,432) (809,842)  
Ending balance (934,023) (880,432) (809,842)
Tools | Accumulated impairment losses      
Changes in property and equipment [Line Items]      
Beginning balance (38) (32)  
Ending balance (40) (38) (32)
Tools | Government grants      
Changes in property and equipment [Line Items]      
Beginning balance (675) (1,027)  
Effect of change in accounting policy 0 0  
Acquisitions 0 (44)  
Disposals 0 0  
Depreciation 281 432  
Impairment 0 [1],[2] 0 [3]  
Others (9) [4],[5] (36)  
Ending balance (403) (675) (1,027)
Construction in progress      
Changes in property and equipment [Line Items]      
Beginning balance 28,766,427 25,523,457  
Ending balance 28,358,259 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 28,821,167 25,572,541  
Effect of change in accounting policy 0 0  
Acquisitions 13,544,091 11,749,397  
Disposals (199,853) (47,463)  
Depreciation 0 0  
Impairment (8,828) [1],[2] (167,603) [3]  
Others (13,737,107) [4],[5] (8,285,705)  
Ending balance 28,419,470 28,821,167 25,572,541
Construction in progress | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 29,026,880 25,610,649  
Ending balance 28,584,806 29,026,880 25,610,649
Construction in progress | Accumulated impairment losses      
Changes in property and equipment [Line Items]      
Beginning balance (205,713) (38,108)  
Ending balance (165,336) (205,713) (38,108)
Construction in progress | Government grants      
Changes in property and equipment [Line Items]      
Beginning balance (54,740) (49,084)  
Effect of change in accounting policy 0 0  
Acquisitions 12,338 (23,895)  
Disposals 0 0  
Depreciation 0 0  
Impairment 0 [1],[2] 0 [3]  
Others (18,809) [4],[5] 18,239  
Ending balance (61,211) (54,740) (49,084)
Finance lease assets      
Changes in property and equipment [Line Items]      
Beginning balance 195,704 297,652  
Ending balance 0 195,704 297,652
Finance lease assets | Carrying Amount Other than Government Grants [Member]      
Changes in property and equipment [Line Items]      
Beginning balance 195,730 297,679  
Effect of change in accounting policy (195,730) 0  
Acquisitions 0 0  
Disposals 0 0  
Depreciation 0 (101,888)  
Impairment 0 [1],[2] 0 [3]  
Others 0 [4],[5] (61)  
Ending balance 0 195,730 297,679
Finance lease assets | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 2,390,701 2,390,680  
Ending balance 0 2,390,701 2,390,680
Finance lease assets | Accumulated depreciation      
Changes in property and equipment [Line Items]      
Beginning balance (2,194,971) (2,093,001)  
Ending balance 0 (2,194,971) (2,093,001)
Finance lease assets | Government grants      
Changes in property and equipment [Line Items]      
Beginning balance (26) (27)  
Effect of change in accounting policy 26 0  
Acquisitions 0 0  
Disposals 0 0  
Depreciation 0 1  
Impairment 0 [1],[2] 0 [3]  
Others 0 [4],[5] 0  
Ending balance 0 (26) (27)
Right-of-use assets      
Changes in property and equipment [Line Items]      
Beginning balance 0 0  
Ending balance 4,783,573 0 0
Right-of-use assets | Carrying Amount Other than Government Grants [Member]      
Changes in property and equipment [Line Items]      
Beginning balance 0 0  
Effect of change in accounting policy 5,143,651 0  
Acquisitions 220,996 0  
Disposals 0 0  
Depreciation (581,074) 0  
Impairment 0 [1],[2] 0 [3]  
Others 0 [4],[5] 0  
Ending balance 4,783,573 0 0
Right-of-use assets | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 0 0  
Ending balance 7,574,010 0 0
Right-of-use assets | Accumulated depreciation      
Changes in property and equipment [Line Items]      
Beginning balance 0 0  
Ending balance (2,790,437) 0 0
Right-of-use assets | Government grants      
Changes in property and equipment [Line Items]      
Beginning balance 0 0  
Ending balance 0 0 0
Retirements, property, plant and equipment      
Changes in property and equipment [Line Items]      
Beginning balance 5,571,754 6,039,484  
Ending balance 7,374,527 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 5,571,754 6,039,484  
Effect of change in accounting policy 0 0  
Acquisitions 0 1,988  
Disposals 0 0  
Depreciation (626,856) (610,435)  
Impairment 0 [1],[2] (146,424) [3]  
Others 2,429,629 [4],[5] 287,141  
Ending balance 7,374,527 5,571,754 6,039,484
Retirements, property, plant and equipment | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 9,424,181 9,395,821  
Ending balance 11,690,188 9,424,181 9,395,821
Retirements, property, plant and equipment | Accumulated depreciation      
Changes in property and equipment [Line Items]      
Beginning balance (3,706,004) (3,356,337)  
Ending balance (4,169,238) (3,706,004) (3,356,337)
Retirements, property, plant and equipment | Accumulated impairment losses      
Changes in property and equipment [Line Items]      
Beginning balance (146,423) 0  
Ending balance (146,423) (146,423) 0
Other property, plant and equipment      
Changes in property and equipment [Line Items]      
Beginning balance   2,439,620  
Ending balance 2,628,681   2,439,620
Other property, plant and equipment | Carrying Amount Other than Government Grants [Member]      
Changes in property and equipment [Line Items]      
Beginning balance 2,359,477 2,439,620  
Effect of change in accounting policy 0 0  
Acquisitions 1,388 8,691  
Disposals (221) (715)  
Depreciation (800,653) (709,579)  
Impairment (581) [1],[2] 0 [3]  
Others 1,069,271 [4],[5] 621,460  
Ending balance 2,628,681 2,359,477 2,439,620
Other property, plant and equipment | Acquisition cost      
Changes in property and equipment [Line Items]      
Beginning balance 11,875,394 11,247,021  
Ending balance 12,955,782 11,875,394 11,247,021
Other property, plant and equipment | Accumulated depreciation      
Changes in property and equipment [Line Items]      
Beginning balance (9,515,917) (8,807,401)  
Ending balance ₩ (10,327,101) ₩ (9,515,917) ₩ (8,807,401)
[1] As described in Note 2, the Company recognized impairment loss of KRW3,819 million related to Wolsong unit 1, Shin-Hanul unit 3 and 4 and reversal of impairment loss of KRW16,693 million related to Wolsong unit 1.
[2] KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiary, performed an impairment test over its land and others. The Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss.
[3] 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 an impairment loss in the consolidated statements of comprehensive income.
[4] 'Others' include immaterial amounts which have been reclassed from Construction-in-progress to other assets in the current period to reflect assets that had finished construction in the prior periods.
[5] 'Others' include the amounts of assets acquired by the business combination. (see Note 51)
[6] As described in Note 26, the amount of acquisition of machinery includes KRW204,787 million of that the Company believes 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.