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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Revenue from contracts with customers	₩ 23,895,631	₩ 24,441,122	₩ 23,012,257
Revenue from other sources	545,016	458,067	423,793
Operating revenue	₩ 24,440,647	₩ 24,899,189	₩ 23,436,050

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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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