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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
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | ₩ (8,383,548) |  | ₩ (9,496,244) | ₩ (8,153,389)
Amounts recognized in profit or loss |  | 1,351,632 |  | 1,011,168 | (1,286,757)
Amount recognized in other comprehensive income (loss) |  | (56,733) |  | 97,255 | (61,321)
Amounts recognized directly in equity |  | 3,432 |  | 4,273 | 5,223
Others | [1] | (41,729) |  |  |
Ending balance |  | (7,126,946) |  | (8,383,548) | (9,496,244)
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 |  | (8,992,509) |  | (9,516,675) | (8,189,092)
Amounts recognized in profit or loss |  | 704,559 |  | 422,638 | (1,271,485)
Amount recognized in other comprehensive income (loss) |  | (56,733) |  | 97,255 | (61,321)
Amounts recognized directly in equity |  | 3,432 |  | 4,273 | 5,223
Others | [1] | (41,729) |  |  |
Ending balance |  | (8,382,980) |  | (8,992,509) | (9,516,675)
Employee benefits |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 594,541 |  | 498,694 | 493,331
Amounts recognized in profit or loss |  | 94,541 |  | 42,144 | 86,008
Amount recognized in other comprehensive income (loss) |  | (40,235) |  | 53,703 | (80,645)
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | 648,847 |  | 594,541 | 498,694
Cash flow hedges |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 39,461 |  | 65,445 | (53,583)
Amounts recognized in profit or loss |  | (23,977) |  | (32,623) | 130,044
Amount recognized in other comprehensive income (loss) |  | (15,642) |  | 6,639 | (11,016)
Amounts recognized directly in equity |  | (841) |  | 0 | 0
Others |  | 0 |  |  |
Ending balance |  | (999) |  | 39,461 | 65,445
Investments in associates or subsidiaries |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | (8,666,871) |  | (8,668,016) | (7,166,345)
Amounts recognized in profit or loss |  | (3,131) |  | (5,447) | (1,510,295)
Amount recognized in other comprehensive income (loss) |  | 4,275 |  | 6,592 | 8,649
Amounts recognized directly in equity |  | 0 |  | 0 | (25)
Others | [1] | 0 |  |  |
Ending balance |  | (8,665,727) |  | (8,666,871) | (8,668,016)
Property, Plant and Equipment |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | (6,522,778) |  | (6,860,440) | (5,527,318)
Amounts recognized in profit or loss |  | (592,440) |  | 337,662 | (1,333,122)
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | (7,115,218) |  | (6,522,778) | (6,860,440)
Finance lease |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | (453,074) |  | (426,949) | (345,431)
Amounts recognized in profit or loss |  | 292,631 |  | (26,125) | (81,518)
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | (160,443) |  | (453,074) | (426,949)
Intangible Assets |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 6,055 |  | 7,648 | 8,987
Amounts recognized in profit or loss |  | (20,232) |  | (1,593) | (1,339)
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | (41,729) |  |  |
Ending balance |  | (55,906) |  | 6,055 | 7,648
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 |  | 19 |  | 890 | (62)
Amounts recognized in profit or loss |  | 322 |  | (871) | 952
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | 341 |  | 19 | 890
Available-for-sale financial assets |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 0 |  | (8,843) | (68,347)
Amounts recognized in profit or loss |  | 0 |  | 0 | 62,055
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | (2,551)
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Ending balance |  | 0 |  | 0 | (8,843)
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 |  | 25,576 |  | 0 | 0
Amounts recognized in profit or loss |  | (3,114) |  | (1,379) | 0
Amount recognized in other comprehensive income (loss) |  | (4,217) |  | 35,798 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | 18,245 |  | 25,576 | 0
Deferred revenue |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 219,742 |  | 230,711 | 213,859
Amounts recognized in profit or loss |  | (6,739) |  | (10,969) | 16,852
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | 213,003 |  | 219,742 | 230,711
Provisions |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 4,800,946 |  | 4,822,833 | 3,583,371
Amounts recognized in profit or loss |  | 655,973 |  | (21,887) | 1,239,462
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | 5,456,919 |  | 4,800,946 | 4,822,833
Doubtful receivables |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 59 |  | 59 | 2,696
Amounts recognized in profit or loss |  | 0 |  | 0 | (2,637)
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | 59 |  | 59 | 59
Other finance liabilities |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 39,493 |  | 32,755 | 30,249
Amounts recognized in profit or loss |  | (4,402) |  | 2,465 | (2,742)
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 4,273 |  | 4,273 | 5,248
Others | [1] | 0 |  |  |
Ending balance |  | 39,364 |  | 39,493 | 32,755
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 |  | 27,080 |  | (1,354) | 138,938
Amounts recognized in profit or loss |  | 30,881 |  | 28,434 | (140,292)
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | 57,961 |  | 27,080 | (1,354)
Allowance for doubtful accounts |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 58,756 |  | 42,931 | 17,252
Amounts recognized in profit or loss |  | (1,149) |  | 15,825 | 25,679
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | 57,607 |  | 58,756 | 42,931
Accrued income |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | (2,914) |  | (1,825) | (5,367)
Amounts recognized in profit or loss |  | (1,462) |  | (1,089) | 3,542
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | (4,376) |  | (2,914) | (1,825)
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 |  | (211,746) |  | (200,927) | (194,309)
Amounts recognized in profit or loss |  | (3,627) |  | (10,819) | (6,618)
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | (215,373) |  | (211,746) | (200,927)
Reserve for research and human development |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 0 |  | (3,041) | (12,883)
Amounts recognized in profit or loss |  |  |  | 3,041 | 9,842
Amount recognized in other comprehensive income (loss) |  |  |  | 0 | 0
Amounts recognized directly in equity |  |  |  | 0 | 0
Ending balance |  |  |  | 0 | (3,041)
Others |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 1,053,146 |  | 952,754 | 695,870
Amounts recognized in profit or loss |  | 290,484 |  | 105,869 | 232,642
Amount recognized in other comprehensive income (loss) |  | (914) |  | (5,477) | 24,242
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | 1,342,716 |  | 1,053,146 | 952,754
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 |  | 608,961 |  | 20,431 | 35,703
Amounts recognized in profit or loss |  | 647,073 |  | 588,530 | (15,272)
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | 1,256,034 |  | 608,961 | 20,431
Unused tax losses |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 554,457 |  | 36,695 | 17,848
Amounts recognized in profit or loss |  | 557,356 |  | 554,457 | 18,847
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others |  | 0 | [1] |  | 0
Ending balance |  | 1,111,813 |  | 554,457 | 36,695
Excess of donation limit |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 17,848 |  | 0 | 0
Amounts recognized in profit or loss |  | 18,847 |  | 17,848 | 0
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Ending balance |  | 36,695 |  | 17,848 | 0
Tax credit |  |  |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |  |  |
Beginning balance |  | 36,656 |  | 20,431 | 35,703
Amounts recognized in profit or loss |  | 70,870 |  | 16,225 | (15,272)
Amount recognized in other comprehensive income (loss) |  | 0 |  | 0 | 0
Amounts recognized directly in equity |  | 0 |  | 0 | 0
Others | [1] | 0 |  |  |
Ending balance |  | ₩ 107,526 |  | ₩ 36,656 | ₩ 20,431
[1] | 'Others' include amount changed due to business combination. (see Note 51)

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