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Lease - Summary of Right-of-Use Assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]    
Increase ₩ 12,614,177 ₩ 13,593,937
Depreciation (554,615) (586,254)
Right-of-use assets    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 4,542,166 4,783,573
Increase 78,213 291,334
Depreciation (554,615) (586,254)
Decrease (11,787) (827)
Others 5,420 54,340
Ending balance 4,059,397 4,542,166
Right-of-use assets | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 7,905,214  
Ending balance 7,848,138 7,905,214
Right-of-use assets | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (3,363,048)  
Ending balance (3,788,741) (3,363,048)
Land    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 706,579 644,074
Increase 7,312 12,269
Depreciation (57,231) (52,069)
Decrease 0 0
Others (3,865) 102,305
Ending balance 652,795 706,579
Land | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 811,014  
Ending balance 814,795 811,014
Land | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (104,435)  
Ending balance (162,000) (104,435)
Buildings    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 47,222 34,577
Increase 22,336 53,182
Depreciation (25,780) (37,609)
Decrease (1,469) (803)
Others 20,575 (2,125)
Ending balance 62,884 47,222
Buildings | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 82,749  
Ending balance 106,823 82,749
Buildings | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (35,527)  
Ending balance (43,939) (35,527)
Structures    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 20,486 25,644
Increase 2,198 260
Depreciation (1,536) (1,485)
Decrease 0 0
Others 0 (3,933)
Ending balance 21,148 20,486
Structures | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 24,175  
Ending balance 26,374 24,175
Structures | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (3,689)  
Ending balance (5,226) (3,689)
Machinery    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 695 824
Increase 0 0
Depreciation (130) (129)
Decrease 0 0
Others 0 0
Ending balance 565 695
Machinery | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 1,308  
Ending balance 1,308 1,308
Machinery | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (613)  
Ending balance (743) (613)
Ships    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 3,437,363 3,688,289
Increase 9,694 183,789
Depreciation (411,291) (427,221)
Decrease 0 0
Others (6,547) (7,494)
Ending balance 3,029,219 3,437,363
Ships | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 4,280,331  
Ending balance 4,217,735 4,280,331
Ships | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (842,968)  
Ending balance (1,188,516) (842,968)
Vehicles    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 13,525 13,708
Increase 9,583 9,009
Depreciation (8,162) (7,747)
Decrease (7) (21)
Others (1,321) (1,424)
Ending balance 13,618 13,525
Vehicles | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 29,281  
Ending balance 30,375 29,281
Vehicles | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance (15,756)  
Ending balance (16,757) (15,756)
Others    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 316,296 [1] 376,457
Increase 27,090 32,825
Depreciation (50,485) (59,994)
Decrease (10,311) (3)
Others (3,422) (32,989)
Ending balance 279,168 [2] 316,296 [1]
Others | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance [1] 2,676,356  
Ending balance 2,650,728 [2] 2,676,356 [1]
Others | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance [1] (2,360,060)  
Ending balance ₩ (2,371,560) [2] ₩ (2,360,060) [1]
[1] Including power purchase agreements (“PPA”) with GS EPS and another LNG combined power supplier.
[2] Including a power purchase agreement (“PPA”) with CGN Yulchon Generation Co., Ltd.