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Construction Contracts (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Construction Services Contracts [Abstract]      
Beginning balance ₩ 3,620,788 ₩ 4,176,595 ₩ 7,236,888
Increase and decrease      
new orders and foreign exchange impact (390,224) (1,207,097) (438,142)
Changes in scope of construction work 10,955 20,513 286,251
Increase (decrease) in Construction contracts from new orders and foreign exchange 379,269 [1] 1,186,584 [2] 151,891 [3]
Recognized as revenue (1,264,916) (1,742,391) (3,212,184)
Ending balance ₩ 2,735,141 ₩ 3,620,788 ₩ 4,176,595
[1] For the year ended December 31, 2019, the increased balance of contracts from new orders and foreign exchange impact is W 390,224 million and the decreased balance of contracts due to changes in scope of construction work is W 10,955 million.
[2] For the year ended December 31, 2018, the increased balance of contracts from new orders and foreign exchange impact is W1,207,097 million and the decreased balance of contracts due to changes in scope of construction work is W20,513 million.
[3] For the year ended December 31, 2017, the increased balance of contracts from new orders and other is W438,142 million and the decreased balance of contracts due to changes in scope of construction work is KRW286,251 million.