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Revenue - Contract - Summary of Changes in Estimated Total Contract Costs and Impact on Profit or Loss (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items]
Changes in total contract revenues	₩ 1,198,301	₩ 1,346,547	₩ 1,362,828
Changes in estimated total contract costs	1,242,208	1,578,811	1,419,726
Changes in profit before income taxes of construction contract
- Current period	(410,413)	(314,409)	(91,397)
- Future periods	₩ 366,506	₩ 82,145	₩ 34,499

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

Increase decrease in contract liability with customers.

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- Definition

Increase decrease in estimated contract costs.

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- Definition

Increase decrease in profit before income taxes of construction cost.

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- Definition

Increase decrease in profit before income taxes of construction contract current period.

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- Definition

Increase decrease in profit before income taxes of construction contract future periods.

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