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Other Income and Expense (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other non-operating income [Abstract]      
Reversal of other provisions ₩ 25,826 ₩ 16,542 ₩ 12,700
Reversal of allowance for doubtful accounts 2,465 0 143
Gains on government grants 269 281 482
Gains on assets contributed 24,324 6,921 17,336
Gains on liabilities exempted 1,314 916 10,303
Compensation and reparations revenue 95,407 113,292 89,901
Revenue from research contracts 4,001 5,276 6,818
Income related to transfer of assets from customers 643,477 604,808 594,548
Rental income 193,567 191,088 186,631
Others of Other Income 45,798 58,849 51,032
Refund of claim for rectification 11,880 1,969 8,933
Adjustment of research project 2,150 3,294 2,267
Maintenance expenses on lease building 2,785 153 176
Training expenses 3,852 3,167 3,220
Deposit redemption 314 436 7
Reversal of expenses on litigation 620 9,926 753
Revenue on royalty fee 0 0 6,909
Reimbursement of insurance fee 22 610 7,145
Gains on guarantee contracts 134 135 39
Miscellaneous other non-operating income 24,041 39,159 21,583
Other non-operating income 1,036,448 997,973 969,894
Other non-operating expense      
Compensation and indemnification expense 11,959 403 23,437
Accretion expenses of other provisions 17,991 7,939 41,924
Depreciation expenses on investment properties 1,453 5,069 923
Depreciation expenses on idle assets 6,604 6,542 6,547
Other bad debt expense 32,503 29,348 17,827
Donations 316,981 64,752 63,743
Others of Other Expense 30,229 127,860 76,929
Operating expenses related to the idle assets 46 49 47
Research grants 91 399 461
Supporting expenses on farming and fishing village 16,115 13,991 13,537
Operating expenses on fitness center 5,101 5,234 4,788
Expenses on adjustment of research and development grants 720 554 404
Taxes and dues 253 188 199
Expenses on R&D supporting 242 67 53
Miscellaneous other non-operating expense 7,661 107,378 57,440
Other non-operating expense ₩ 417,720 ₩ 241,913 ₩ 231,330