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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
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Detail Explanation of Revenue in Statement of Profit or Loss | The Group has recognized the following amounts relating to revenue in the statement of profit or loss:
(In millions of Korean won) |  | 2018 |
Revenue from contracts with customers |  | ￦ | 23,012,257 |
Revenue from other sources |  |  | 423,793 |
Total revenue |  | ￦ | 23,436,050 |
Detail Explanation of Operating Revenue | Operating revenues for the years ended December 31, 2018, are as follows:
(In millions of Korean won) |  | 2018 |
Mobile services |  | ￦ | 6,827,685 |
Fixed-line services: |  |  | 4,869,253 |
Fixed-line and VoIP telephone services |  |  | 1,708,319 |
Broadband Internet access services |  |  | 2,112,763 |
Data communication services |  |  | 1,048,171 |
Media and content |  |  | 3,182,324 |
Financial services |  |  | 3,444,917 |
Sale of goods |  |  | 3,288,911 |
Others |  |  | 1,822,960 |
Total |  | ￦ | 23,436,050 |
Detail Analysis of Contract with Customer Assets and Liabilities | The contract assets and liabilities recognized in relation to the revenues from contracts with customers are as follows:
(In millions of Korean won) |  | January 1, 2018 |  |  | December 31, 2018 |
Contract assets |  | ￦ | 421,131 |  |  | ￦ | 398,797 |
Contract liabilities |  |  | 282,836 |  |  |  | 347,461 |
Deferred revenue |  |  | 88,732 |  |  |  | 96,198 |
Detail Analysis of Contract Costs Recognized as Assets | The contract costs recognized as assets are as follows:
(In millions of Korean won) |  | January 1, 2018 |  |  | December 31, 2018 |
Contract costs recognized as assets |  | ￦ | 1,306,409 |  |  | ￦ | 1,469,855 |
Detail of Revenue Arising from Carried-Forward Contract Liabilities | In 2018, the recognized revenue arising from carried-forward contract liabilities from prior year is as follows:
(In millions of Korean won) |  | 2018 |
Revenue recognized that was included in the contract liability balance at the beginning of the year |  |  |  |
Allocation of the transaction price |  | ￦ | 183,905 |
Deferred revenue of joining/installment fee |  |  | 39,975 |
Others |  |  | 1,536 |
Total |  | ￦ | 225,416

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- Definition The explanation of the significant changes in the contract assets and the contract liabilities. [Refer: Contract assets; Contract liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_118&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Disclosure of revenue recognized related to contract liabilities. + References No definition available. + Details
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