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Other Income and Expense (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other non-operating income [Abstract]      
Reversal of other provisions ₩ 16,542 ₩ 12,700 ₩ 35,265
Reversal of allowance for doubtful accounts 0 143 2,166
Gains on government grants 281 482 430
Gains on assets contributed 6,921 17,336 4,218
Gains on liabilities exempted 916 10,303 3,166
Compensation and reparations revenue 113,292 89,901 89,196
Revenue from research contracts 5,276 6,818 12,580
Income related to transfer of assets from customers 604,808 594,548 478,973
Rental income 191,088 186,631 192,136
Others of Other Income 58,849 51,032 50,988
Refund of claim for rectification 1,969 8,933 9,655
Adjustment of research project 3,294 2,267 3,884
Maintenance expenses on lease building 153 176 135
Training expenses 3,167 3,220 3,045
Deposit redemption 436 7 34
Reversal of expenses on litigation 9,926 753 360
Revenue on royalty fee 0 6,909 2,888
Reimbursement of insurance fee 610 7,145 1,498
Gains on guarantee contracts 135 39 456
Miscellaneous other non-operating income 39,159 21,583 29,033
Other non-operating income 997,973 969,894 869,118
Other non-operating expense      
Compensation and indemnification expense 403 23,437 37
Accretion expenses of other provisions 7,939 41,924 7,535
Depreciation expenses on investment properties 5,069 923 1,176
Depreciation expenses on idle assets 6,542 6,547 6,644
Other bad debt expense 29,348 17,827 1,778
Donations 64,752 63,743 119,421
Others of Other Expense 127,860 76,929 43,464
Operating expenses related to the idle assets 49 47 136
Research grants 399 461 1,180
Supporting expenses on farming and fishing village 13,991 13,537 11,956
Operating expenses on fitness center 5,234 4,788 3,498
Expenses on adjustment of research and development grants 554 404 806
Taxes and dues 188 199 2,270
Expenses on R&D supporting 67 53 5,459
Miscellaneous other non-operating expense 107,378 57,440 18,159
Other non-operating expense ₩ 241,913 ₩ 231,330 ₩ 180,055