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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, 2019
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Detail Explanation of Revenue in the consolidated Statement of operations | The Group has recognized the following amounts relating to revenue in the Consolidated Statements of Operations:
(In millions of Korean won) |  | 2018 |  |  | 2019 |
Revenue from contracts with customers |  | ￦ | 23,012,257 |  |  | ￦ | 24,441,122 |
Revenue from other sources |  |  | 423,793 |  |  |  | 458,067 |
Total revenue |  | ￦ | 23,436,050 |  |  | ￦ | 24,899,189 |
Detail Explanation of Operating Revenue | Operating revenues for the years ended December 31, 2018 and 2019 are as follows:
(In millions of Korean won) |  | 2018 |  |  | 2019 |
Mobile services |  | ￦ | 6,827,685 |  |  | ￦ | 6,795,124 |
Fixed-line services |  |  | 4,869,253 |  |  |  | 4,866,698 |
Fixed-line and VoIP telephone services |  |  | 1,708,319 |  |  |  | 1,578,546 |
Broadband Internet access services |  |  | 2,112,763 |  |  |  | 2,177,447 |
Data communication services |  |  | 1,048,171 |  |  |  | 1,110,705 |
Media and content |  |  | 2,261,808 |  |  |  | 2,516,256 |
Financial services |  |  | 3,444,917 |  |  |  | 3,641,655 |
Sale of goods |  |  | 3,288,911 |  |  |  | 4,194,168 |
Others |  |  | 2,743,476 |  |  |  | 2,885,288 |
Total |  | ￦ | 23,436,050 |  |  | ￦ | 24,899,189 |
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) |  | December 31, 2018 |  |  | December 31, 2019 |
Contract assets 1 |  | ￦ | 503,452 |  |  | ￦ | 655,329 |
Contract liabilities 1 |  |  | 357,633 |  |  |  | 413,442 |
Deferred revenue 2 |  | ￦ | 96,198 |  |  | ￦ | 92,557 |
| 1 | The Group recognized contract assets of ￦ 98,288 million and contract liabilities of ￦ 47,832 million for longterm construction contracts as at December 31, 2019 (2018: contract assets of ￦ 104,655 million and contract liabilities of ￦ 10,172 million). The Group recognizes contract assets as trade and other receivables, and contract liabilities as other current liabilities.
| 2 | Deferred revenue recognized relating to government grant is excluded.
Detail Analysis of Contract Costs Recognized as Assets | The contract costs recognized as assets are as follows:
(In millions of Korean won) |  | December 31, 2018 |  |  | December 31, 2019 |
Incremental cost of contract establishment |  | ￦ | 1,409,721 |  |  | ￦ | 1,764,009 |
Cost of Contract performance |  |  | 60,134 |  |  |  | 85,234 |
Detail of Revenue Arising from Carried-Forward Contract Liabilities | The recognized revenue arising from carried-forward contract liabilities from prior year is as follows:
(In millions of Korean won) |  | 2018 |  |  | 2019 |
Revenue recognized that was included in the contract liability balance at the beginning of the year |  |  |  |  |  |  |  |
Allocation of the transaction price |  | ￦ | 183,905 |  |  | ￦ | 258,548 |
Deferred revenue of joining/installment fee |  |  | 39,975 |  |  |  | 44,032 |
Others |  |  | 1,536 |  |  |  | — |
Total |  | ￦ | 225,416 |  |  | ￦ | 302,580 |

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- Definition The entire disclosure for revenue from contracts with customers. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Section Presentation -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&doctype=Standard&dita_xref=IFRS15_g105-109_TI -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&doctype=Standard&dita_xref=IFRS15_g110-129_TI -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_118&doctype=Standard -URIDate 2019-03-27 + Details
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