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Construction Contracts (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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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.

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- Definition The amount of revenue arising from construction contracts. Construction contracts are contracts specifically negotiated for the construction of an asset or a combination of assets that are closely interrelated or interdependent in terms of their design, technology and function or their ultimate purpose or use. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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