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Consolidated Statements Of Comprehensive Income - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of comprehensive income [Abstract]      
Sales (Notes 4,35,45 and 47) ₩ 59,335,889 ₩ 59,763,087 ₩ 58,581,727
Sales of goods 55,772,548 55,379,487 54,367,036
Sales of construction services (Note 20) 3,212,184 4,026,857 3,761,204
Sales of services 351,157 356,743 453,487
Cost of sales (Notes 13,25,43 and 47) (52,098,855) (45,549,553) (45,457,729)
Cost of sales of goods (48,454,036) (41,237,372) (41,348,917)
Cost of sales of construction services (3,047,396) (3,755,144) (3,563,120)
Cost of sales of services (597,423) (557,037) (545,692)
Gross profit 7,237,034 14,213,534 13,123,998
Selling and administrative expenses (Note 25,36,43 and 47) (2,762,855) (2,639,232) (2,153,261)
Other income (Note 37) 869,118 840,184 808,214
Other expenses (Note 37) (180,055) (188,624) (108,848)
Other gains, net (Note 38) 156,627 70,498 8,610,773
Operating profit (Note 4) 5,319,869 12,296,360 20,280,876
Finance income (Note 5,11 and 39) 1,530,618 791,543 1,182,988
Finance expenses (Note 5,11 and 40) (3,127,952) (2,437,087) (3,015,457)
Profit (loss) related to associates, joint ventures and subsidiaries (Note 4 and 17) (108,317) (137,348) 207,379
Share in profit of associates and joint ventures 241,537 224,435 280,794
Gain on disposal of investments in associates and joint ventures 609 52 4,731
Gain on disposal of investments in subsidiaries (Note 16) 0 0 8,376
Share in loss of associates and joint ventures (323,225) (243,361) (86,522)
Loss on disposal of investments in associates and joint ventures 0 (2,935) 0
Impairment loss on investments in associates and joint ventures (Note 17) (27,238) (115,539) 0
Profit before income tax 3,614,218 10,513,468 18,655,786
Income tax expense (Note 41) (2,172,824) (3,365,141) (5,239,413)
Profit for the period 1,441,394 7,148,327 13,416,373
Other comprehensive income (loss) (Note 5,11,25,31 and 34) (94,716) (2,302) 34,006
Items that will not be reclassified subsequently to profit or loss: [Abstract]      
Remeasurements of defined benefit liability, net of tax (Note 25 and 31) 170,337 (75,926) (87,861)
Share in other comprehensive loss of associates and joint ventures, net of tax (Note 31) 10,067 (2,515) (283)
Items that are or may be reclassified subsequently to profit or loss: [Abstract]      
Net change in the unrealized fair value of available-for-sale financial assets, net of tax (Note 34) (7,098) 61,279 9,648
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (Note 5,11 and 34) 20,868 28,414 4,409
Foreign currency translation of foreign operations, net of tax (Note 34) (134,196) 41,360 18,535
Share in other comprehensive income (loss) of associates and joint ventures, net of tax (Note 34) (154,694) (54,914) 89,558
Total comprehensive income for the period 1,346,678 7,146,025 13,450,379
Profit or loss attributable to: [Abstract]      
Owners of the controlling company (Note 44) 1,298,720 7,048,581 13,289,127
Non-controlling interests 142,674 99,746 127,246
Profit for the period 1,441,394 7,148,327 13,416,373
Total comprehensive income attributable to: [Abstract]      
Owners of the controlling company 1,230,194 7,041,557 13,308,132
Non-controlling interests 116,484 104,468 142,247
Other comprehensive income (loss) ₩ 1,346,678 ₩ 7,146,025 ₩ 13,450,379
Earnings per share (in won) (Note 44) [Abstract]      
Basic and diluted earnings per share ₩ 2,023 ₩ 10,980 ₩ 20,701