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Lease - Summary of Right-of-Use Assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of quantitative information about right-of-use assets [line items]    
Increase ₩ 12,486,698 ₩ 12,638,471
Depreciation (509,068) (558,565)
Right-of-use assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 4,059,397 4,542,166
Increase 197,016 78,213
Depreciation (509,068) (558,565)
Decrease (2,838) (11,787)
Others (33,382) 9,370
Ending balance 3,711,125 4,059,397
Right-of-use assets | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 7,848,138  
Ending balance 5,992,724 7,848,138
Right-of-use assets | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (3,788,741)  
Ending balance (2,281,599) (3,788,741)
Land    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 652,795 706,579
Increase 63,654 7,312
Depreciation (41,260) (57,231)
Decrease 0 0
Others (13,390) (3,865)
Ending balance 661,799 652,795
Land | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 814,795  
Ending balance 886,076 814,795
Land | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (162,000)  
Ending balance (224,277) (162,000)
Buildings    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 62,884 47,222
Increase 42,399 22,336
Depreciation (30,243) (25,780)
Decrease (1,042) (1,469)
Others 858 20,575
Ending balance 74,856 62,884
Buildings | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 106,823  
Ending balance 135,290 106,823
Buildings | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (43,939)  
Ending balance (60,434) (43,939)
Structures    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 21,148 20,486
Increase 4,256 2,198
Depreciation (1,758) (1,536)
Decrease 0 0
Others 319 0
Ending balance 23,965 21,148
Structures | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 26,374  
Ending balance 30,879 26,374
Structures | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (5,226)  
Ending balance (6,914) (5,226)
Machinery    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 565 695
Increase 429 0
Depreciation (159) (130)
Decrease 0 0
Others 0 0
Ending balance 835 565
Machinery | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 1,308  
Ending balance 1,737 1,308
Machinery | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (743)  
Ending balance (902) (743)
Ships    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 3,029,219 3,437,363
Increase 0 9,694
Depreciation (393,677) (411,291)
Decrease 0 0
Others (38,679) (6,547)
Ending balance 2,596,863 3,029,219
Ships | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 4,217,735  
Ending balance 4,151,460 4,217,735
Ships | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (1,188,516)  
Ending balance (1,554,597) (1,188,516)
Vehicles    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 13,618 13,525
Increase 13,475 9,583
Depreciation (8,673) (8,162)
Decrease (962) (7)
Others (2,742) (1,321)
Ending balance 14,716 13,618
Vehicles | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 30,375  
Ending balance 35,712 30,375
Vehicles | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (16,757)  
Ending balance (20,996) (16,757)
Others    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 279,168 [1] 316,296
Increase 72,803 27,090
Depreciation (33,298) (54,435)
Decrease (834) (10,311)
Others 20,252 528
Ending balance [1] 338,091 279,168
Others | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance [1] 2,650,728  
Ending balance [1] 751,570 2,650,728
Others | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance [1] (2,371,560)  
Ending balance [1] ₩ (413,479) ₩ (2,371,560)
[1] Including a power purchase agreement (“PPA”) with CGN Yulchon Generation Co., Ltd.