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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, 2020
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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 |  |  | 2020 |
Revenue from contracts with customers |  | ￦ | 23,012,257 |  |  | ￦ | 24,441,122 |  |  | ￦ | 23,895,631 |
Revenue from other sources |  |  | 423,793 |  |  |  | 458,067 |  |  |  | 545,016 |
Total revenue |  | ￦ | 23,436,050 |  |  | ￦ | 24,899,189 |  |  | ￦ | 24,440,647 |
Detail Explanation of Operating Revenue | Operating revenues for the years ended December 31, 2018, 2019 and 2020 are as follows:
(In millions of Korean won) |  | 2018 |  |  | 2019 |  |  | 2020 |
Mobile services |  | ￦ | 6,827,685 |  |  | ￦ | 6,795,124 |  |  | ￦ | 6,805,218 |
Fixed-line services |  |  | 4,869,253 |  |  |  | 4,866,698 |  |  |  | 4,827,015 |
Fixed-line and VoIP telephone services |  |  | 1,708,319 |  |  |  | 1,578,546 |  |  |  | 1,463,553 |
Broadband Internet access services |  |  | 2,112,763 |  |  |  | 2,177,447 |  |  |  | 2,256,188 |
Data communication services |  |  | 1,048,171 |  |  |  | 1,110,705 |  |  |  | 1,107,274 |
Media and content |  |  | 2,261,808 |  |  |  | 2,516,256 |  |  |  | 2,637,691 |
Financial services |  |  | 3,444,917 |  |  |  | 3,641,655 |  |  |  | 3,493,920 |
Sale of goods |  |  | 3,288,911 |  |  |  | 4,194,168 |  |  |  | 3,593,127 |
Others |  |  | 2,743,476 |  |  |  | 2,885,288 |  |  |  | 3,083,676 |
Total |  | ￦ | 23,436,050 |  |  | ￦ | 24,899,189 |  |  | ￦ | 24,440,647 |
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, 2019 |  |  | December 31, 2020 |
Contract assets 1 |  | ￦ | 655,329 |  |  | ￦ | 672,672 |
Contract liabilities 1 |  |  | 413,442 |  |  |  | 413,707 |
Deferred revenue 2 |  | ￦ | 92,557 |  |  | ￦ | 89,694 |
| 1 | The Group recognized contract assets of ￦ 86,234 million and contract liabilities of ￦ 29,574 million for long term construction contracts as at December 31, 2020 (2019: contract assets of ￦ 98,288 million and contract liabilities of ￦ 47,832 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, 2019 |  |  | December 31, 2020 |
Incremental cost of contract establishment |  | ￦ | 1,764,009 |  |  | ￦ | 1,726,191 |
Cost of Contract performance |  |  | 85,234 |  |  |  | 78,757 |
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 |  |  | 2020 |
Revenue recognized that was included in the contract liability balance at the beginning of the year |  |  |  |  |  |  |  |  |  |  |  |
Allocation of the transaction price |  | ￦ | 183,905 |  |  | ￦ | 266,478 |  |  | ￦ | 251,975 |
Deferred revenue of joining/installment fee |  |  | 39,975 |  |  |  | 44,032 |  |  |  | 42,685 |
Others |  |  | 1,536 |  |  |  | — |  |  |  | — |
Total |  | ￦ | 225,416 |  |  | ￦ | 310,510 |  |  | ￦ | 294,660 |

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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 2020-01-01 -Section Presentation -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&doctype=Standard&dita_xref=IFRS15_g105-109_TI -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&doctype=Standard&dita_xref=IFRS15_g110-129_TI -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_118&doctype=Standard -URIDate 2020-01-01 + Details
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