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Operating Expenses - Summary of Operating Expenses (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Profit (loss) [abstract]      
Salaries and wages ₩ 3,845,842 ₩ 3,568,456 ₩ 3,477,596
Depreciation 2,674,205 2,745,969 2,762,773
Amortization of intangible assets 607,527 618,533 582,493
Commissions 1,080,168 1,085,865 1,099,429
Interconnection charges 579,613 640,612 690,285
International interconnection fee 226,627 214,058 216,633
Purchase of inventories 4,414,094 4,053,693 3,407,263
Changes of inventories (432,607) (187,439) 162,323
Sales commission 1,942,841 2,201,778 1,968,035
Service cost 1,540,869 1,428,405 1,322,337
Utilities 323,411 323,313 323,406
Taxes and dues 285,131 279,574 255,480
Rent 460,377 448,772 455,457
Insurance premium 73,654 69,384 178,231
Installation fee 143,669 146,783 156,669
Advertising expenses 157,675 197,114 185,560
Research and development expenses 176,758 168,635 167,881
Card service cost 3,112,618 3,094,894 3,049,559
Others 1,122,718 1,379,438 1,319,688
Total ₩ 22,335,190 ₩ 22,477,837 ₩ 21,781,098