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Other Income and Expense (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other non-operating income [Abstract]      
Reversal of other provisions ₩ 12,700 ₩ 35,265 ₩ 22,034
Reversal of allowance for doubtful accounts 143 2,166 5,489
Gains on government grants 482 430 111
Gains on assets contributed 17,336 4,218 12,254
Gains on liabilities exempted 10,303 3,166 1,959
Compensation and reparations revenue 89,901 89,196 114,530
Revenue from research contracts 6,818 12,580 13,143
Income related to transfer of assets from customers 594,548 478,973 427,297
Rental income 186,631 192,136 211,580
Others of Other Income 51,032 50,988 31,787
Refund of claim for rectification 8,933 9,655 8,722
Adjustment of research project 2,267 3,884 4,148
Maintenance expenses on lease building 176 135 354
Training expenses 3,220 3,045 4,478
Deposit redemption 7 34 991
Reversal of expenses on litigation 753 360 893
Revenue on royalty fee 6,909 2,888 2,486
Reimbursement of insurance fee 7,145 1,498 0
Gains on guarantee contracts 39 456 2,796
Miscellaneous other non-operating income 21,583 29,033 6,919
Other non-operating income 969,894 869,118 840,184
Other non-operating expense      
Compensation and indemnification expense 23,437 37 0
Accretion expenses of other provisions 41,924 7,535 4,556
Depreciation expenses on investment properties 923 1,176 678
Depreciation expenses on idle assets 6,547 6,644 6,639
Other bad debt expense 17,827 1,778 4,585
Donations 63,743 119,421 114,094
Others of Other Expense 76,929 43,464 58,072
Operating expenses related to the idle assets 47 136 459
Research grants 461 1,180 1,461
Supporting expenses on farming and fishing village 13,537 11,956 15,201
Operating expenses on fitness center 4,788 3,498 2,706
Expenses on adjustment of research and development grants 404 806 0
Taxes and dues 199 2,270 4,582
Expenses on R&D supporting 53 5,459 690
Miscellaneous other non-operating expense [1] 57,440 18,159 32,973
Other non-operating expense ₩ 231,330 ₩ 180,055 ₩ 188,624
[1] Others include KRW38,886 million of impairment loss on construction-in-progress of Cheonji unit 1 and 2 and Daejin unit 1 and 2 as described in note 2.