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Disclosure of quantitative information about right-of-use assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [Line Items]    
Effect of change in accounting policy ₩ 0 ₩ 4,947,947
Increase 13,593,937 14,221,355
Depreciation (586,254) (581,074)
Right-of-use assets    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 4,783,573 0
Effect of change in accounting policy [1]   5,143,651
Increase 291,334 220,996
Depreciation (586,254) (581,074)
Decrease (827)  
Others 54,340  
Ending balance 4,542,166 4,783,573
Right-of-use assets | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 7,574,010 0
Ending balance 7,905,214 7,574,010
Right-of-use assets | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance (2,790,437) 0
Ending balance (3,363,048) (2,790,437)
Land    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 644,074 0
Effect of change in accounting policy   684,386
Increase 12,269 8,717
Depreciation (52,069) (49,029)
Decrease 0  
Others 102,305  
Ending balance 706,579 644,074
Land | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 693,103 0
Ending balance 811,014 693,103
Land | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance (49,029) 0
Ending balance (104,435) (49,029)
Buildings    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 34,577 0
Effect of change in accounting policy   36,874
Increase 53,182 18,106
Depreciation (37,609) (20,403)
Decrease (803)  
Others (2,125)  
Ending balance 47,222 34,577
Buildings | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 54,980 0
Ending balance 82,749 54,980
Buildings | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance (20,403) 0
Ending balance (35,527) (20,403)
Structures    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 25,644 0
Effect of change in accounting policy   20,840
Increase 260 7,358
Depreciation (1,485) (2,554)
Decrease 0  
Others (3,933)  
Ending balance 20,486 25,644
Structures | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 28,198 0
Ending balance 24,175 28,198
Structures | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance (2,554) 0
Ending balance (3,689) (2,554)
Machinery    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 824 0
Effect of change in accounting policy   0
Increase 0 1,308
Depreciation (129) (484)
Decrease 0  
Others 0  
Ending balance 695 824
Machinery | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 1,308 0
Ending balance 1,308 1,308
Machinery | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance (484) 0
Ending balance (613) (484)
Ships    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 3,688,289 0
Effect of change in accounting policy   3,986,947
Increase 183,789 126,807
Depreciation (427,221) (425,465)
Decrease 0  
Others (7,494)  
Ending balance 3,437,363 3,688,289
Ships | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 4,113,754 0
Ending balance 4,280,331 4,113,754
Ships | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance (425,465) 0
Ending balance (842,968) (425,465)
Vehicles    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 13,708 0
Effect of change in accounting policy   11,258
Increase 9,009 9,559
Depreciation (7,747) (7,109)
Decrease (21)  
Others (1,424)  
Ending balance 13,525 13,708
Vehicles | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 20,817 0
Ending balance 29,281 20,817
Vehicles | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance (7,109) 0
Ending balance (15,756) (7,109)
Others    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 376,457 [2] 0
Effect of change in accounting policy   403,346
Increase 32,825 49,141
Depreciation (59,994) (76,030)
Decrease (3)  
Others (32,989)  
Ending balance 316,296 [3] 376,457 [2]
Others | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 2,661,850 [2] 0
Ending balance 2,676,356 [3] 2,661,850 [2]
Others | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance (2,285,393) [2] 0
Ending balance ₩ (2,360,060) [3] ₩ (2,285,393) [2]
[1] Including transferred amount of KRW195,704 million, which was classified as finance lease assets as of December 31, 2018.
[2] Including power purchase agreements ("PPA") with GS EPS and two other LNG combined power suppliers.
[3] Including power purchase agreements ("PPA") with GS EPS and another LNG combined power supplier.