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Trade and Other Receivables - Changes in the allowance for doubtful accounts (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Trade receivables |  |  |
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items] |  |  |
Beginning balance | ₩ 215,868 | ₩ 173,583 | ₩ 71,985
Effect of change in accounting policy | 0 | 6,641 |
Loss allowance as at January 1 under IFRS 9 | 215,868 | 180,224 |
Changes in allowance account for credit losses of financial assets |  |  |
Bad debt expense | 29,221 | 41,498 | 126,714
Write-off | (10,106) | (7,696) | (32,995)
Reversal | (41,940) | (1,726) | 0
Others | 19,716 | 3,568 | 7,879
Ending balance | 212,759 | 215,868 | 173,583
Other receivables |  |  |
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items] |  |  |
Beginning balance | 104,726 | 78,008 | 87,661
Effect of change in accounting policy | 0 | 128 |
Loss allowance as at January 1 under IFRS 9 | 104,726 | 78,136 |
Changes in allowance account for credit losses of financial assets |  |  |
Bad debt expense | 19,206 | 17,817 | 1,778
Write-off | (1,146) | (244) | (3,129)
Reversal | 0 | (143) | (2,166)
Others | (8,631) | 9,160 | (6,136)
Ending balance | ₩ 114,155 | ₩ 104,726 | ₩ 78,008

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- Definition The amount of additional allowance for credit losses of financial assets recognised in profit or loss. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in allowance account for credit losses of financial assets resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition The decrease in an allowance account for credit losses of financial assets resulting from the reversal of impairment. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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