Geographic and Other Information - Revenue and Non-current Assets by Geography (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Disclosure of geographical areas [Line Items]
Revenue	₩ 26,151,781		₩ 29,878,043	₩ 24,261,561
Revenue included in forward exchange hedging loss	26,364,737	[1],[2]	29,878,043	24,261,561
Property, plant and equipment	20,946,933		20,558,446	20,139,703
Intangible assets	1,752,957		1,644,898	1,020,088
Domestic [member]
Disclosure of geographical areas [Line Items]
Revenue	678,246	[2]	632,531	912,049
Property, plant and equipment	14,042,794		12,006,204
Intangible assets	1,633,866		1,452,823
China [member]
Disclosure of geographical areas [Line Items]
Revenue	17,434,407	[2]	19,866,707	16,685,746
Property, plant and equipment	4,302,527		6,393,129
Intangible assets	53,388		83,655
Vietnam [member]
Disclosure of geographical areas [Line Items]
Property, plant and equipment	2,590,438		2,146,652
Intangible assets	20,315		19,954
Other countries [member]
Disclosure of geographical areas [Line Items]
Property, plant and equipment	11,174		12,461
Intangible assets	45,388		88,466
Foreign countries [member]
Disclosure of geographical areas [Line Items]
Revenue	25,686,491	[2]	29,245,512	23,349,512
Property, plant and equipment	6,904,139		8,552,242
Intangible assets	119,091		192,075
Asia (excluding China) [member]
Disclosure of geographical areas [Line Items]
Revenue	2,796,648	[2]	3,256,126	2,297,290
United States [member]
Disclosure of geographical areas [Line Items]
Revenue	3,078,924	[2]	3,263,055	2,070,944
Europe (excluding Poland) [member]
Disclosure of geographical areas [Line Items]
Revenue	988,566	[2]	1,159,669	1,215,345
Poland [member]
Disclosure of geographical areas [Line Items]
Revenue	₩ 1,387,946	[2]	₩ 1,699,955	₩ 1,080,187

[1] (*) Total revenue in 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] Total revenue in 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.