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Segment Information - Summary of Segment Information (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [Line Items]      
Operating revenues ₩ 23,436,050 ₩ 23,546,929 ₩ 23,164,202
Operating income (loss) 1,100,860 1,069,092 1,383,104
Depreciation and Amortization 3,281,732 3,364,502 3,345,266
Operating segments [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 27,172,293 27,217,843 26,742,436
Operating income (loss) 1,153,167 1,112,554 1,421,977
Depreciation and Amortization 3,274,769 3,356,126 3,337,353
Operating segments [member] | Marketing/Customer [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 14,061,629 16,242,552 16,187,739
Operating income (loss) 886,515 1,018,593 1,093,377
Depreciation and Amortization 2,293,809 2,895,930 2,870,161
Operating segments [member] | Finance [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 3,560,417 3,637,917 3,577,549
Operating income (loss) 145,463 205,678 208,566
Depreciation and Amortization 22,504 28,827 28,868
Operating segments [member] | Satellite TV [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 690,821 685,822 668,945
Operating income (loss) 66,735 75,373 79,987
Depreciation and Amortization 98,310 99,216 98,895
Operating segments [member] | Corporate customer business [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 2,509,880    
Operating income (loss) 208,584    
Depreciation and Amortization 546,635    
Operating segments [member] | Others [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 6,349,546 6,651,552 6,308,203
Operating income (loss) (154,130) (187,090) 40,047
Depreciation and Amortization 313,511 332,153 339,429
Elimination [member]      
Disclosure of operating segments [Line Items]      
Operating revenues (3,736,243) (3,670,914) (3,578,234)
Operating income (loss) (52,307) (43,462) (38,873)
Depreciation and Amortization ₩ 6,963 ₩ 8,376 ₩ 7,913