Geographic and Other Information - Revenue and Non-current Assets by Geography (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Disclosure of geographical areas [Line Items]
Revenue	₩ 21,330,819	₩ 26,151,781		₩ 29,878,043
Revenue included in forward exchange hedging loss	21,330,819	26,364,737	[1],[2]	29,878,043
Property, plant and equipment	20,200,332	20,946,933		20,558,446
Intangible assets	1,773,955	1,752,957		1,644,898
Investment property	32,995	28,269
Domestic [member]
Disclosure of geographical areas [Line Items]
Revenue	633,529	678,246	[1]	632,531
Property, plant and equipment	13,583,136	14,042,794
Intangible assets	1,683,116	1,633,866
Investment property	32,995	28,269
China [member]
Disclosure of geographical areas [Line Items]
Revenue	14,704,357	17,434,407	[1]	19,866,707
Property, plant and equipment	3,358,395	4,302,527
Intangible assets	32,009	53,388
Vietnam [member]
Disclosure of geographical areas [Line Items]
Property, plant and equipment	3,244,729	2,590,438
Intangible assets	31,472	20,315
Other countries [member]
Disclosure of geographical areas [Line Items]
Property, plant and equipment	14,072	11,174
Intangible assets	27,358	45,388
Foreign countries [member]
Disclosure of geographical areas [Line Items]
Revenue	20,697,290	25,686,491	[1]	29,245,512
Property, plant and equipment	6,617,196	6,904,139
Intangible assets	90,839	119,091
Asia (excluding China) [member]
Disclosure of geographical areas [Line Items]
Revenue	2,397,980	2,796,648	[1]	3,256,126
Americas [member]
Disclosure of geographical areas [Line Items]
Revenue	2,079,628	3,078,924	[1]	3,263,055
Europe (excluding Poland) [member]
Disclosure of geographical areas [Line Items]
Revenue	613,924	988,566	[1]	1,159,669
Poland [member]
Disclosure of geographical areas [Line Items]
Revenue	₩ 901,401	₩ 1,387,946	[1]	₩ 1,699,955

[1] Revenue for 2022 excludes W212,956 million of forward exchange hedging loss which was reclassified from accumulated other comprehensive income to revenue when the sales from the hedged forecast transactions are recognized.

[2] Revenue for 2022 excludes W212,956 million of forward exchange hedging loss which was reclassified from accumulated other comprehensive income to revenue when the sales from the hedged forecast transactions are recognized.