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Construction Services Contracts (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Construction Services Contracts [Abstract]      
Beginning balance ₩ 7,236,888 ₩ 12,308,839 ₩ 17,081,074
Increase and decrease [Abstract]      
New orders and other (438,142) (718,118) (412,617)
Changes in scope of construction work 286,251 1,763,212 1,423,648
Increase (decrease) in Construction contracts 151,891 [1] (1,045,094) [2] (1,011,031) [3]
Recognized as revenue (3,212,184) (4,026,857) (3,761,204)
Ending balance ₩ 4,176,595 ₩ 7,236,888 ₩ 12,308,839
[1] For the year ended December 31, 2017, the increased balance of contracts from new orders and other is ￦438,142 million and the decreased balance of contracts due to changes in scope of construction work is ￦286,251 million.
[2] For the year ended December 31, 2016, the increased balance of contracts from new orders and other is ￦718,118 million and the decreased balance of contracts due to changes in scope of construction work is ￦1,763,212 million.
[3] For the year ended December 31, 2015, the increased balance of contracts from new orders and other is ￦412,617 million and the decreased balance of contracts due to changes in scope of construction work is ￦1,423,648 million.