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Operating Expenses - Summary of Operating Expenses (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Profit or loss [abstract]      
Salaries and wages ₩ 3,568,456 ₩ 3,477,596 ₩ 3,303,484
Depreciation 2,745,969 2,762,773 2,756,131
Amortization of intangible assets 618,533 582,493 582,467
Commissions 1,085,865 1,099,429 1,036,852
Interconnection charges 640,612 690,285 689,293
International interconnection fee 214,058 216,633 231,060
Purchase of inventories 4,053,693 3,407,263 3,963,036
Changes of inventories (187,439) 162,323 (198,028)
Sales commission 2,201,778 1,968,035 1,856,595
Service cost 1,428,405 1,322,337 1,163,887
Utilities 323,313 323,406 319,303
Taxes and dues 279,574 255,480 256,958
Rent 448,772 455,457 469,950
Insurance premium 69,384 178,231 211,104
Installation fee 146,783 156,669 249,413
Advertising expenses 197,114 185,560 177,348
Research and development expenses 168,635 167,881 183,821
Card service cost 3,094,894 3,049,559 2,959,765
Others 1,379,438 1,319,688 1,410,349
Total ₩ 22,477,837 ₩ 21,781,098 ₩ 21,622,788