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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail explanation of Operating revenue (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]
Mobile services	₩ 6,795,124	₩ 6,827,685
Fixed-line services:	4,866,698	4,869,253
Fixed-line and VoIP telephone services	1,578,546	1,708,319
Broadband Internet access services	2,177,447	2,112,763
Data communication services	1,110,705	1,048,171
Media and content	2,516,256	2,261,808
Financial services	3,641,655	3,444,917
Sale of goods	4,194,168	3,288,911
Others	2,885,288	2,743,476
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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