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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Construction Services Contracts [Abstract]      
Beginning balance ₩ 3,152,725 ₩ 2,735,141 ₩ 3,620,788
Increase and decrease      
New orders and foreign exchange impact 458,635 1,512,460 390,224
Changes in scope of construction work 72,427 282,701 10,955
Increase (decrease) in Construction contracts from new orders and foreign exchange 386,208 1,229,759 379,269
Recognized as revenue (754,998) (812,175) (1,264,916)
Ending balance ₩ 2,783,935 ₩ 3,152,725 ₩ 2,735,141