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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail Explanation of Revenue in the Consolidated Statement of operations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Revenue from contracts with customers	₩ 24,441,122	₩ 23,012,257
Revenue from other sources	458,067	423,793
Operating revenue	₩ 24,899,189	₩ 23,436,050	₩ 23,546,929

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Expiry date 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants. Effective 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

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Revenue from other sources.

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