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Revision of Prior Financial Statements - Summary of Consolidated Statements of Financial Position (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Jan. 01, 2016
Dec. 31, 2015
Disclosure of changes in accounting policies, accounting estimates and errors [line items]              
Current assets ₩ 12,157,814 ₩ 11,117,433 ₩ 9,828,525 ₩ 9,866,302      
Trade and other receivables 5,680,349 5,969,040 5,964,565 5,477,634      
Total assets 32,474,120 31,252,689 29,895,721 30,814,580      
Current liabilities 9,394,123 9,744,055 9,474,162 9,539,195      
Trade and other payables 7,007,515 7,426,385 7,426,088 7,141,725      
Current income tax liabilities 249,837   82,984 102,843      
Total liabilities 17,815,630 17,062,496 16,712,367 17,897,638      
Equity attribute to owners of the Controlling Company 13,129,901 12,721,456 11,791,590 11,564,098 ₩ 11,564,098 ₩ 10,933,231  
Retained earnings 11,256,069   9,961,150 9,778,707 9,778,707 9,147,467  
Total equity 14,658,490 14,190,193 13,183,354 12,916,942 12,916,942   ₩ 12,253,627
Total liabilities and equity 32,474,120   29,895,721 30,814,580      
As previously reported [member]              
Disclosure of changes in accounting policies, accounting estimates and errors [line items]              
Current assets 10,822,686 9,828,525 9,678,243 9,716,020      
Trade and other receivables 5,687,490 5,964,565 5,814,283 5,327,352      
Total assets 31,051,560 29,895,721 29,745,439 30,664,298      
Current liabilities 9,075,863 9,474,162 9,458,104 9,523,137      
Trade and other payables   7,426,088 7,424,134 7,139,771      
Current income tax liabilities     68,880 88,739      
Total liabilities 17,442,862 16,712,367 16,696,309 17,881,580      
Equity attribute to owners of the Controlling Company 12,159,471 11,791,590 11,657,366 11,429,874 11,429,874 10,835,735  
Retained earnings     9,826,926 9,644,483 9,644,483 9,049,971  
Total equity 13,608,698 ₩ 13,183,354 13,049,130 12,782,718     ₩ 12,156,131
Total liabilities and equity     29,745,439 30,664,298      
Adjustments [member]              
Disclosure of changes in accounting policies, accounting estimates and errors [line items]              
Current assets     150,282 150,282      
Trade and other receivables     150,282 150,282      
Total assets     150,282 150,282      
Current liabilities     16,058 16,058      
Trade and other payables     1,954 1,954      
Current income tax liabilities     14,104 14,104      
Total liabilities     16,058 16,058      
Equity attribute to owners of the Controlling Company     134,224 134,224 134,224 97,496  
Retained earnings ₩ 97,496   134,224 134,224 ₩ 134,224 ₩ 97,496  
Total equity     134,224 134,224      
Total liabilities and equity     ₩ 150,282 ₩ 150,282