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Net defined benefit liability (asset) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [Line Items]      
Beginning balance ₩ 1,924,087    
Changes in net defined benefit liability (asset)      
Current service cost 509,520 ₩ 440,300 ₩ 369,899
Remeasurement component 84,775 (82,550)  
Past service cost (2,027) 301,442 0
Loss from settlement 0 (2,017) (767)
Ending balance 1,899,782 1,924,087  
Defined benefit obligation      
Disclosure of defined benefit plans [Line Items]      
Beginning balance 4,035,400 3,414,116  
Changes in net defined benefit liability (asset)      
Current service cost 509,520 440,300  
Interest expense (income) [1] 83,248 83,619  
Remeasurement component 84,385 (93,736)  
Past service cost (2,027) 301,442  
Loss from settlement 0 (2,018)  
Actual payments (139,956) (108,057)  
Others 44 (266)  
Ending balance 4,570,614 4,035,400 3,414,116
Plan assets      
Disclosure of defined benefit plans [Line Items]      
Beginning balance 2,111,313 1,775,331  
Changes in net defined benefit liability (asset)      
Interest expense (income) 42,742 41,597  
Remeasurement component (390) (11,186)  
Contributions by the employers 582,275 348,386  
Actual payments (65,108) (42,815)  
Ending balance ₩ 2,670,832 ₩ 2,111,313 ₩ 1,775,331
[1] The Company decided to include a performance incentive for management evaluation in the average wage during the previous year and recognized it as past service cost.