Inventories (Tables)

12 Months Ended

Dec. 31, 2025

Textblock 1 [Abstract]

Summary of Inventories

Details of inventories as of December 31, 2024 and 2025 are as follows:

(i)As of December 31, 2024

(In millions of won)	Cost		Valuation allowance			Carrying amount
Finished goods	W	995,999		(51,305	)		944,694
Work-in-process		1,184,516		(82,655	)		1,101,861
Raw materials		477,929		(17,648	)		460,281
Supplies		184,869		(20,463	)		164,406
Total	W	2,843,313		(172,071	)		2,671,242

(ii)As of December 31, 2025

(In millions of won)	Cost		Valuation allowance			Carrying amount
Finished goods	W	802,647		(57,184	)		745,463
Work-in-process		1,271,007		(156,597	)		1,114,410
Raw materials		528,812		(24,969	)		503,843
Supplies		204,905		(22,955	)		181,950
Total	W	2,807,371		(261,705	)		2,545,666

Inventories Recognized as Cost of Sales and Inventory Write-Downs Included in Cost of Sales and Usage of Inventory Write-Downs

For the years ended December 31, 2023, 2024 and 2025, the amounts of inventories recognized as cost of sales and inventory write-downs included in cost of sales and usage of inventory write-downs are as follows:

(In millions of won)	2023		2024		2025
Cost of sales	W	20,985,643		24,039,928		22,433,623
Including: Inventory write-downs		192,627		175,262		257,995
Usage of inventory write-downs		245,619		192,627		172,071

There were no significant reversals of inventory write-downs recognized during the years ended December 31, 2023, 2024 and 2025.