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Income tax expense - Summary of income tax expense calculated by multiplying net income before tax with the tax rate (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Profit before income taxes	₩ 6,929,009	₩ 6,029,092	₩ 5,964,960
Income taxes at statutory tax rates	1,818,897	1,581,318	1,564,388
Non-taxable income	(20,796)	(44,370)	(10,350)
Non-deductible expense	23,909	19,755	16,514
Tax credit	(1,318)	(1,484)	(1,185)
Others	23,798	(84,297)	(82,407)
Income tax expenses	₩ 1,844,490	₩ 1,470,922	₩ 1,486,960
Effective tax rate	26.62%	24.40%	24.93%

X

- Definition

The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to expenses not deductible in determining taxable profit (tax loss). [Refer: Accounting profit]

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