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Leases - Summary of Right-of-Use Assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of quantitative information about right-of-use assets [line items]    
Depreciation ₩ (538,995) ₩ (536,517)
Right-of-use assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 3,363,743 3,711,125
Increase 132,495 261,862
Depreciation (538,995) (536,517)
Decrease (2,252) (2,613)
Others 91,405 (70,114)
Ending balance 3,046,396 3,363,743
Right-of-use assets | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 6,041,794  
Ending balance 6,031,076 6,041,794
Right-of-use assets | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (2,678,051)  
Ending balance (2,984,680) (2,678,051)
Land    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 655,860 661,799
Increase 12,369 2,696
Depreciation (65,245) (57,461)
Decrease (117) (126)
Others 74,735 48,952
Ending balance 677,602 655,860
Land | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 937,481  
Ending balance 1,017,114 937,481
Land | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (281,621)  
Ending balance (339,512) (281,621)
Buildings    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 90,573 74,856
Increase 61,397 24,622
Depreciation (48,371) (32,591)
Decrease (399) (904)
Others 2,641 24,590
Ending balance 105,841 90,573
Buildings | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 188,017  
Ending balance 214,258 188,017
Buildings | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (97,444)  
Ending balance (108,417) (97,444)
Structures    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 37,356 23,965
Increase 4,115 49
Depreciation (4,595) (2,471)
Decrease 0 (273)
Others 3,983 16,086
Ending balance 40,859 37,356
Structures | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 46,573  
Ending balance 52,983 46,573
Structures | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (9,217)  
Ending balance (12,124) (9,217)
Machinery    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 5,943 835
Increase 26,200 0
Depreciation (7,083) (94)
Decrease 0 0
Others 2,000 5,202
Ending balance 27,060 5,943
Machinery | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 26,453  
Ending balance 54,654 26,453
Machinery | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (20,510)  
Ending balance (27,594) (20,510)
Ships    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 2,313,305 2,596,863
Increase 0 199,538
Depreciation (363,032) (382,298)
Decrease (1,656) 0
Others (17,524) (100,798)
Ending balance 1,931,093 2,313,305
Ships | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 4,137,168  
Ending balance 3,946,265 4,137,168
Ships | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (1,823,863)  
Ending balance (2,015,172) (1,823,863)
Vehicles    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 25,491 14,716
Increase 11,042 21,097
Depreciation (14,167) (10,464)
Decrease (77) (1,008)
Others (1,369) 1,150
Ending balance 20,920 25,491
Vehicles | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 59,208  
Ending balance 59,402 59,208
Vehicles | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (33,717)  
Ending balance (38,482) (33,717)
Others    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 235,215 [1] 338,091
Increase 17,372 13,860
Depreciation (36,502) (51,138)
Decrease (3) (302)
Others 26,939 (65,296)
Ending balance [1] 243,021 235,215
Others | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance [1] 646,894  
Ending balance [1] 686,400 646,894
Others | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance [1] (411,679)  
Ending balance [1] ₩ (443,379) ₩ (411,679)
[1] Including a power purchase agreement (“PPA”) with CGN Yulchon Generation Co., Ltd.