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Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | ₩ (7,126,946) | ₩ (8,383,548)
Amounts recognized in profit or loss |  | (291,641) | 1,351,632
Amount recognized in other comprehensive income (loss) |  | 47,213 | (56,733)
Amounts recognized directly in equity |  | 4,273 | 3,432
Others | [1] | 0 | (41,729)
Ending balance |  | (7,367,101) | (7,126,946)
Deferred income tax on temporary differences |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | (8,382,980) | (8,992,509)
Amounts recognized in profit or loss |  | (69,278) | 704,559
Amount recognized in other comprehensive income (loss) |  | 47,213 | (56,733)
Amounts recognized directly in equity |  | 4,273 | 3,432
Others | [1] | 0 | (41,729)
Ending balance |  | (8,400,772) | (8,382,980)
Employee benefits |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 648,847 | 594,541
Amounts recognized in profit or loss |  | 14,566 | 94,541
Amount recognized in other comprehensive income (loss) |  | 26,374 | (40,235)
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 689,787 | 648,847
Cash flow hedges |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | (999) | 39,461
Amounts recognized in profit or loss |  | 63,817 | (23,977)
Amount recognized in other comprehensive income (loss) |  | (47,231) | (15,642)
Amounts recognized directly in equity |  | 0 | (841)
Others | [1] | 0 | 0
Ending balance |  | 15,587 | (999)
Investments in associates and subsidiaries |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | (8,665,727) | (8,666,871)
Amounts recognized in profit or loss |  | (38,002) | (3,131)
Amount recognized in other comprehensive income (loss) |  | 35,714 | 4,275
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | (8,668,015) | (8,665,727)
Property, Plant and Equipment |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | (7,115,218) | (6,522,778)
Amounts recognized in profit or loss |  | (598,231) | (592,440)
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | (7,713,449) | (7,115,218)
Finance lease |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | (160,443) | (453,074)
Amounts recognized in profit or loss |  | (50,977) | 292,631
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | (211,420) | (160,443)
Intangible Assets |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | (55,906) | 6,055
Amounts recognized in profit or loss |  | 24,740 | (20,232)
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | (41,729)
Ending balance |  | (31,166) | (55,906)
Financial assets at fair value through profit or loss |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 341 | 19
Amounts recognized in profit or loss |  | (328) | 322
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 13 | 341
Financial assets at fair value through other comprehensive income |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 18,245 | 25,576
Amounts recognized in profit or loss |  | 258 | (3,114)
Amount recognized in other comprehensive income (loss) |  | 19,447 | (4,217)
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 37,950 | 18,245
Deferred revenue |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 213,003 | 219,742
Amounts recognized in profit or loss |  | (13,302) | (6,739)
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 199,701 | 213,003
Provisions |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 5,456,919 | 4,800,946
Amounts recognized in profit or loss |  | 459,884 | 655,973
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 5,916,803 | 5,456,919
Doubtful receivables |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 59 | 59
Amounts recognized in profit or loss |  | (59) | 0
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 0 | 59
Other financial liabilities |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 39,364 | 39,493
Amounts recognized in profit or loss |  | (13,238) | (4,402)
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 4,273 | 4,273
Others | [1] | 0 | 0
Ending balance |  | 30,399 | 39,364
Gains or losses on foreign exchange translation |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 57,961 | 27,080
Amounts recognized in profit or loss |  | (69,596) | 30,881
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | (11,635) | 57,961
Allowance for doubtful accounts |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 57,607 | 58,756
Amounts recognized in profit or loss |  | (1,478) | (1,149)
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 56,129 | 57,607
Accrued income |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | (4,376) | (2,914)
Amounts recognized in profit or loss |  | 13,320 | (1,462)
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 8,944 | (4,376)
Special deduction for property, plant and equipment |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | (215,373) | (211,746)
Amounts recognized in profit or loss |  | (10,978) | (3,627)
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | (226,351) | (215,373)
Others |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 1,342,716 | 1,053,146
Amounts recognized in profit or loss |  | 150,326 | 290,484
Amount recognized in other comprehensive income (loss) |  | 12,909 | (914)
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 1,505,951 | 1,342,716
Deferred income tax on unused tax losses and tax credit |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 1,256,034 | 608,961
Amounts recognized in profit or loss |  | (222,363) | 647,073
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 1,033,671 | 1,256,034
Unused tax losses |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 1,111,813 | 554,457
Amounts recognized in profit or loss |  | (218,739) | 557,356
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 893,074 | 1,111,813
Excess of donation limit |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 36,695 | 17,848
Amounts recognized in profit or loss |  | (1,514) | 18,847
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | 35,181 | 36,695
Tax credit |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance |  | 107,526 | 36,656
Amounts recognized in profit or loss |  | (2,110) | 70,870
Amount recognized in other comprehensive income (loss) |  | 0 | 0
Amounts recognized directly in equity |  | 0 | 0
Others | [1] | 0 | 0
Ending balance |  | ₩ 105,416 | ₩ 107,526
[1] | 'Others' include amount changed due to business combination. (see Note 51)

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_90&doctype=Standard -URIDate 2020-01-01 + Details
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