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Construction Contracts - Summary of Changes in Total Contract Amount in Which Revenue is Not Yet Recognized (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Construction Services Contracts [Abstract]      
Beginning balance ₩ 5,594,946 ₩ 2,783,935 ₩ 3,152,725
Increase and decrease      
New orders and foreign exchange impact 1,029,165 3,578,599 458,635
Changes in scope of construction work 43,116 81,401 72,427
Increase (decrease) in Construction contracts from new orders and foreign exchange 986,049 3,457,964 386,208
Recognized as revenue (785,395) (646,953) (754,998)
Ending balance ₩ 5,795,600 ₩ 5,594,946 ₩ 2,783,935