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Financial Risk Management - Summary of Debt-to-equity Ratios (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [abstract]
Total liabilities	₩ 19,009,318	₩ 17,815,630
Total equity	₩ 15,144,090	₩ 14,658,490	₩ 13,183,354	₩ 12,916,942
Debt-to-equity ratio	126.00%	122.00%

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The amount of residual interest in the assets of the entity after deducting all its liabilities.

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Expiry date 2020-01-01: The amount of present obligations of the entity arising from past events, the settlement of which is expected to result in an outflow from the entity of resources embodying economic benefits. Effective 2020-01-01: The amount of a present obligation of the entity to transfer an economic resource as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

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