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Changes in Accounting Policies - Summary of Impact on Financial Statements Due to Application of IFRS 15 at the Date of Initial Application (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018 | Jan. 01, 2017 | Jan. 01, 2016 | Dec. 31, 2015
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Current assets | ₩ 12,157,814 | ₩ 9,828,525 |  | ₩ 11,117,433 | ₩ 9,866,302 |  |
Trade and other receivables | 5,680,349 | 5,964,565 |  | 5,969,040 | 5,477,634 |  |
Inventories | 1,074,634 | 642,027 |  | 642,027 | 454,588 |  |
Other current assets | 1,687,548 | 304,860 |  | 1,589,293 | 311,135 |  |
Others | 3,715,283 |  |  | 2,917,073 |  |  |
Non-current assets | 20,316,306 | 20,067,196 |  | 20,135,256 | 20,948,278 |  |
Trade and other receivables | 842,995 | 828,832 |  | 826,547 | 709,011 |  |
Deferred income tax assets | 465,369 | 712,222 |  | 359,949 | 701,409 |  |
Other non-current assets | 545,895 | 107,165 |  | 529,783 | 106,099 |  |
Others | 18,462,047 |  |  | 18,418,977 |  |  |
Total assets | 32,474,120 | 29,895,721 |  | 31,252,689 | 30,814,580 |  |
Current liabilities | 9,394,123 | 9,474,162 |  | 9,744,055 | 9,539,195 |  |
Trade and other payables | 7,007,515 | 7,426,088 |  | 7,426,385 | 7,141,725 |  |
Deferred revenue | 52,878 | 17,906 |  | 51,561 | 35,617 |  |
Provisions | 117,881 | 78,172 |  | 78,349 | 96,485 |  |
Other current liabilities | 596,589 | 258,314 |  | 494,079 | 342,291 |  |
Others | 8,626,775 |  |  | 1,693,681 |  |  |
Non-current liabilities | 8,421,507 | 7,238,205 |  | 7,318,441 | 8,358,443 |  |
Deferred revenue | 110,702 | 91,698 |  | 115,529 | 85,372 |  |
Deferred income tax liabilities | 204,785 | 128,462 |  | 135,367 | 137,680 |  |
Other non-current liabilities | 423,626 | 237,284 |  | 286,783 | 58,761 |  |
Others | 7,682,394 |  |  | 6,780,762 |  |  |
Total liabilities | 17,815,630 | 16,712,367 |  | 17,062,496 | 17,897,638 |  |
Equity attribute to owners of the Controlling Company | 13,129,901 | 11,791,590 | ₩ 11,564,098 | 12,721,456 | 11,564,098 | ₩ 10,933,231 |
Non-controllinginterest | 1,528,589 | 1,391,764 |  | 1,468,737 | 1,352,844 |  |
Total equity | 14,658,490 | 13,183,354 | 12,916,942 | 14,190,193 | 12,916,942 |  | ₩ 12,253,627
Operating revenue | 23,436,050 | 23,546,929 | 23,164,202 |  |  |  |
Operating expenses | 22,335,190 | 22,477,837 | 21,781,098 |  |  |  |
Operating profit | 1,100,860 | 1,069,092 | 1,383,104 |  |  |  |
Financial income | 374,243 | 406,328 | 296,139 |  |  |  |
Financial costs | 435,659 | 644,531 | 515,087 |  |  |  |
Share of net losses of associates and joint venture | (5,467) | (13,892) | 2,599 |  |  |  |
Profit before income tax | 1,033,977 | 816,997 | 1,166,755 |  |  |  |
Income tax expense | 314,565 | 270,656 | 334,910 |  |  |  |
Profit for the year | 719,412 | 546,341 | 831,845 |  |  |  |
As previously reported [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Current assets | 10,822,686 | 9,678,243 |  | 9,828,525 | 9,716,020 |  |
Trade and other receivables | 5,687,490 | 5,814,283 |  | 5,964,565 | 5,327,352 |  |
Inventories | 1,127,669 |  |  | 642,027 |  |  |
Other current assets | 292,244 |  |  | 304,860 |  |  |
Others | 3,715,283 |  |  | 2,917,073 |  |  |
Non-current assets | 20,228,874 |  |  | 20,067,196 |  |  |
Trade and other receivables | 847,612 |  |  | 828,832 |  |  |
Deferred income tax assets | 822,297 |  |  | 712,222 |  |  |
Other non-current assets | 96,918 |  |  | 107,165 |  |  |
Others | 18,462,047 |  |  | 18,418,977 |  |  |
Total assets | 31,051,560 | 29,745,439 |  | 29,895,721 | 30,664,298 |  |
Current liabilities | 9,075,863 | 9,458,104 |  | 9,474,162 | 9,523,137 |  |
Trade and other payables |  | 7,424,134 |  | 7,426,088 | 7,139,771 |  |
Deferred revenue | 14,821 |  |  | 17,906 |  |  |
Provisions | 117,316 |  |  | 78,172 |  |  |
Other current liabilities | 316,951 |  |  | 258,315 |  |  |
Others | 8,626,775 |  |  | 1,693,681 |  |  |
Non-current liabilities | 8,366,999 |  |  | 7,238,205 |  |  |
Deferred revenue | 83,469 |  |  | 91,698 |  |  |
Deferred income tax liabilities | 183,766 |  |  | 128,462 |  |  |
Other non-current liabilities | 417,370 |  |  | 237,283 |  |  |
Others | 7,682,394 |  |  | 6,780,762 |  |  |
Total liabilities | 17,442,862 | 16,696,309 |  | 16,712,367 | 17,881,580 |  |
Equity attribute to owners of the Controlling Company | 12,159,471 | 11,657,366 | 11,429,874 | 11,791,590 | 11,429,874 | ₩ 10,835,735 |
Non-controllinginterest | 1,449,227 |  |  | 1,391,764 |  |  |
Total equity | 13,608,698 | 13,049,130 |  | 13,183,354 | ₩ 12,782,718 |  | 12,156,131
Operating revenue | 23,704,320 |  | 23,120,878 |  |  |  |
Operating expenses | 22,651,685 |  |  |  |  |  |
Operating profit | 1,052,635 |  | 1,339,780 |  |  |  |
Financial income | 370,381 |  |  |  |  |  |
Financial costs | 452,519 |  |  |  |  |  |
Share of net losses of associates and joint venture | (5,467) |  |  |  |  |  |
Profit before income tax | 965,030 |  | 1,123,431 |  |  |  |
Income tax expense | 296,621 |  | 328,314 |  |  |  |
Profit for the year | 668,409 |  | ₩ 795,117 |  |  |  |
Increase (decrease) due to application of IFRS 15 [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Current assets | (1,335,128) |  |  | 1,288,908 |  |  |
Trade and other receivables | 7,141 |  |  | 4,475 |  |  |
Inventories | 53,035 |  |  |  |  |  |
Other current assets | (1,395,304) |  |  | 1,284,433 |  |  |
Non-current assets | (87,432) |  |  | 68,060 |  |  |
Trade and other receivables | 4,617 |  |  | (2,285) |  |  |
Deferred income tax assets | 356,928 |  |  | (352,273) |  |  |
Other non-current assets | (448,977) |  |  | 422,618 |  |  |
Total assets | (1,422,560) |  |  | 1,356,968 |  |  |
Current liabilities | (318,260) |  |  | 269,893 |  |  |
Trade and other payables |  |  |  | 297 |  |  |
Deferred revenue | (38,057) |  |  | 33,655 |  |  |
Provisions | (565) |  |  | 177 |  |  |
Other current liabilities | (279,638) |  |  | 235,764 |  |  |
Non-current liabilities | (54,508) |  |  | 80,236 |  |  |
Deferred revenue | (27,233) |  |  | 23,831 |  |  |
Deferred income tax liabilities | (21,019) |  |  | 6,905 |  |  |
Other non-current liabilities | (6,256) |  |  | 49,500 |  |  |
Total liabilities | (372,768) |  |  | 350,129 |  |  |
Equity attribute to owners of the Controlling Company | (970,430) |  |  | 929,866 |  |  |
Non-controllinginterest | (79,362) |  |  | 76,973 |  |  |
Total equity | (1,049,792) |  |  | ₩ 1,006,839 |  |  |
Operating revenue | 268,270 |  |  |  |  |  |
Operating expenses | 316,495 |  |  |  |  |  |
Operating profit | (48,225) |  |  |  |  |  |
Financial income | (3,862) |  |  |  |  |  |
Financial costs | 16,860 |  |  |  |  |  |
Profit before income tax | (68,947) |  |  |  |  |  |
Income tax expense | (17,944) |  |  |  |  |  |
Profit for the year | (51,003) |  |  |  |  |  |
Adjusted [member] |  |  |  |  |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |  |  |  |  |
Total equity |  | ₩ 14,232,276 |  |  |  |  | ₩ 97,496
Operating revenue | 23,436,050 |  |  |  |  |  |
Operating expenses | 22,335,190 |  |  |  |  |  |
Operating profit | 1,100,860 |  |  |  |  |  |
Financial income | 374,243 |  |  |  |  |  |
Financial costs | 435,659 |  |  |  |  |  |
Share of net losses of associates and joint venture | (5,467) |  |  |  |  |  |
Profit before income tax | 1,033,977 |  |  |  |  |  |
Income tax expense | 314,565 |  |  |  |  |  |
Profit for the year | ₩ 719,412 |  |  |  |  |  |

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