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Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from (used in) operating activities [abstract] |  |  |
Profit for the year | ₩ 546,341 | ₩ 795,117 | ₩ 624,685
Adjustments to reconcile net income |  |  |
Income tax expense | 270,656 | 328,314 | 346,146
Interest income | (108,639) | (130,066) | (161,123)
Interest expense | 302,464 | 337,219 | 445,814
Dividends income | (4,785) | (3,926) | (11,371)
Depreciation | 2,802,531 | 2,821,779 | 3,030,821
Amortization of intangible assets | 635,150 | 599,721 | 609,185
Provision for severance benefits | 218,966 | 217,255 | 217,787
Impairment losses on trade receivables | 45,704 | 92,711 | 161,448
Share of net profit or loss of associates and joint ventures | 15,480 | (2,547) | (5,562)
Loss(gain) on disposal of associates and joint ventures | 979 | (1,450) | (4,848)
Impairment loss of associates and joint ventures | 3,662 | 17,128 |
Gain on disposal of subsidiaries |  |  | (256,230)
Loss on disposal of property, plant and equipment and investment in properties | 150,293 | 74,913 | 129,466
Loss on disposal of intangible assets | 4,271 | 7,703 | 33,978
Loss on impairment of intangible assets | 116,095 | 135,264 | 292,345
Loss on foreign currency translation | (213,341) | 109,784 | 164,374
Loss(gain) on valuation of derivatives | 268,094 | (117,181) | (306,538)
Impairment losses on available-for-sale financial assets | 9 | 966 | 1,805
Gain on disposal of available-for-sale financial assets | (89,598) | (22,695) | (131,041)
Others | (251,193) | 64,863 | 24,140
Changes in operating assets and liabilities |  |  |
Decrease(increase) in trade receivables | (303,340) | 252,196 | 112,674
Increase in other receivables | (346,013) | (770,893) | (21,749)
Decrease(increase) in other current assets | 11,792 | 48,549 | (19,701)
Increase in other non-current assets | (43,790) | (51,765) | (137,532)
Decrease(increase) in inventories | (205,403) | 167,873 | (270,343)
Increase(decrease) in trade payables | 162,110 | (114,838) | 81,295
Increase(decrease) in other payables | 214,689 | 705,807 | (48,680)
Increase(decrease) in other current liabilities | 288,553 | 37,798 | (9,452)
Increase in other non-current liabilities | 174,618 | 30,762 | 119,836
Decrease in provisions | (12,574) | (12,583) | (8,902)
Decrease in deferred revenue | (13,086) | (69,179) | (82,582)
Increase in plan assets | (203,420) | (224,244) | (223,194)
Payment of severance benefits | (118,391) | (121,835) | (117,691)
Cash generated from operations (1+2+3) | ₩ 4,318,884 | ₩ 5,202,520 | ₩ 4,579,260

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