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Revision of Prior Financial Statements - Summary of Consolidated Statement of Operations & Comprehensive Income (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of changes in accounting policies, accounting estimates and errors [line items]      
Operating revenue ₩ 23,436,050 ₩ 23,546,929 ₩ 23,164,202
Operating profit 1,100,860 1,069,092 1,383,104
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
Profit for the year attributable to the equity holders of the Controlling Company 645,571 461,559 745,090
Total comprehensive income for the year 664,784 478,053 826,175
Total comprehensive income for the year attributable to the equity holders of the Controlling Company 589,179 ₩ 413,149 738,413
As previously reported [member]      
Disclosure of changes in accounting policies, accounting estimates and errors [line items]      
Operating revenue 23,704,320   23,120,878
Operating profit 1,052,635   1,339,780
Profit before income tax 965,030   1,123,431
Income tax expense 296,621   328,314
Profit for the year ₩ 668,409   795,117
Profit for the year attributable to the equity holders of the Controlling Company     708,362
Total comprehensive income for the year     789,447
Total comprehensive income for the year attributable to the equity holders of the Controlling Company     701,685
Adjustments [member]      
Disclosure of changes in accounting policies, accounting estimates and errors [line items]      
Operating revenue     43,324
Operating profit     43,324
Profit before income tax     43,324
Income tax expense     6,596
Profit for the year     36,728
Profit for the year attributable to the equity holders of the Controlling Company     36,728
Total comprehensive income for the year     36,728
Total comprehensive income for the year attributable to the equity holders of the Controlling Company     ₩ 36,728