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Disclosure of quantitative information about right-of-use assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [Line Items]    
Effect of change in accounting policy ₩ 4,947,947 ₩ 0
Increase 14,221,355 12,266,870
Depreciation (581,074)  
Right-of-use assets    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Effect of change in accounting policy 5,143,651  
Increase 220,996  
Depreciation (581,074)  
Ending balance 4,783,573  
Right-of-use assets | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Ending balance 7,574,010  
Right-of-use assets | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Ending balance (2,790,437)  
Land    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Effect of change in accounting policy 684,386  
Increase 8,717  
Depreciation (49,029)  
Ending balance 644,074 0
Land | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance 693,103 0
Land | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance (49,029) 0
Buildings    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Effect of change in accounting policy 36,874  
Increase 18,106  
Depreciation (20,403)  
Ending balance 34,577 0
Buildings | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance 54,980 0
Buildings | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance (20,403) 0
Structures    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Effect of change in accounting policy 20,840  
Increase 7,358  
Depreciation (2,554)  
Ending balance 25,644 0
Structures | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance 28,198 0
Structures | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance (2,554) 0
Machinery    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Effect of change in accounting policy 0  
Increase 1,308  
Depreciation (484)  
Ending balance 824 0
Machinery | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance 1,308 0
Machinery | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance (484) 0
Ships    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Effect of change in accounting policy 3,986,947  
Increase 126,807  
Depreciation (425,465)  
Ending balance 3,688,289 0
Ships | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance 4,113,754 0
Ships | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance (425,465) 0
Vehicles    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Effect of change in accounting policy 11,258  
Increase 9,559  
Depreciation (7,109)  
Ending balance 13,708 0
Vehicles | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance 20,817 0
Vehicles | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance (7,109) 0
Others    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Effect of change in accounting policy [1] 403,346  
Increase 49,141  
Depreciation (76,030)  
Ending balance 376,457 [2] 0
Others | Acquisition cost    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance 2,661,850 [2] 0
Others | Accumulated depreciation    
Disclosure of quantitative information about right-of-use assets [Line Items]    
Beginning balance 0  
Ending balance ₩ (2,285,393) [2] ₩ 0
[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.