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Operating Expenses - Summary of Operating Expenses (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Profit (loss) [abstract]      
Salaries and wages ₩ 3,974,233 ₩ 3,845,842 ₩ 3,568,456
Depreciation 2,530,252 2,674,205 2,745,969
Depreciation of right-of-use assets 452,056    
Amortization of intangible assets 656,611 607,527 618,533
Commissions 1,115,477 1,080,168 1,085,865
Interconnection charges 534,025 579,613 640,612
International interconnection fee 240,254 226,627 214,058
Purchase of inventories 4,453,820 4,414,094 4,053,693
Changes of inventories 282,957 (432,607) (187,439)
Sales commission 2,315,731 1,942,841 2,201,778
Service cost 1,610,261 1,540,869 1,428,405
Utilities 332,816 323,411 323,313
Taxes and dues 276,815 285,131 279,574
Rent 193,357 460,377 448,772
Insurance premium 82,404 73,654 69,384
Installation fee 155,178 143,669 146,783
Advertising expenses 150,166 157,675 197,114
Research and development expenses 165,028 176,758 168,635
Card service cost 3,066,766 3,112,618 3,094,894
Others 1,290,807 1,122,718 1,379,438
Total ₩ 23,879,015 ₩ 22,335,190 ₩ 22,477,837