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Leases - Summary of Right-of-Use Assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation ₩ (536,517) ₩ (509,068)
Right-of-use assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 3,711,125 4,059,397
Increase 261,862 197,016
Depreciation (536,517) (509,068)
Decrease (2,613) (2,838)
Others (70,114) (33,382)
Ending balance 3,363,743 3,711,125
Right-of-use assets | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 5,992,724  
Ending balance 6,041,794 5,992,724
Right-of-use assets | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (2,281,599)  
Ending balance (2,678,051) (2,281,599)
Land    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 661,799 652,795
Increase 2,696 63,654
Depreciation (57,461) (41,260)
Decrease (126) 0
Others 48,952 (13,390)
Ending balance 655,860 661,799
Land | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 886,076  
Ending balance 937,481 886,076
Land | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (224,277)  
Ending balance (281,621) (224,277)
Buildings    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 74,856 62,884
Increase 24,622 42,399
Depreciation (32,591) (30,243)
Decrease (904) (1,042)
Others 24,590 858
Ending balance 90,573 74,856
Buildings | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 135,290  
Ending balance 188,017 135,290
Buildings | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (60,434)  
Ending balance (97,444) (60,434)
Structures    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 23,965 21,148
Increase 49 4,256
Depreciation (2,471) (1,758)
Decrease (273) 0
Others 16,086 319
Ending balance 37,356 23,965
Structures | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 30,879  
Ending balance 46,573 30,879
Structures | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (6,914)  
Ending balance (9,217) (6,914)
Machinery    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 835 565
Increase 0 429
Depreciation (94) (159)
Decrease 0 0
Others 5,202 0
Ending balance 5,943 835
Machinery | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 1,737  
Ending balance 26,453 1,737
Machinery | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (902)  
Ending balance (20,510) (902)
Ships    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 2,596,863 3,029,219
Increase 199,538 0
Depreciation (382,298) (393,677)
Decrease 0 0
Others (100,798) (38,679)
Ending balance 2,313,305 2,596,863
Ships | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 4,151,460  
Ending balance 4,137,168 4,151,460
Ships | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (1,554,597)  
Ending balance (1,823,863) (1,554,597)
Vehicles    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 14,716 13,618
Increase 21,097 13,475
Depreciation (10,464) (8,673)
Decrease (1,008) (962)
Others 1,150 (2,742)
Ending balance 25,491 14,716
Vehicles | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 35,712  
Ending balance 59,208 35,712
Vehicles | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (20,996)  
Ending balance (33,717) (20,996)
Others    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 338,091 [1] 279,168
Increase 13,860 72,803
Depreciation (51,138) (33,298)
Decrease (302) (834)
Others (65,296) 20,252
Ending balance [1] 235,215 338,091
Others | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance [1] 751,570  
Ending balance [1] 646,894 751,570
Others | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance [1] (413,479)  
Ending balance [1] ₩ (411,679) ₩ (413,479)
[1] Including a power purchase agreement (“PPA”) with CGN Yulchon Generation Co., Ltd.