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Other Income and Expense (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other non-operating income [Abstract]      
Reversal of other provisions ₩ 15,265 ₩ 15,548 ₩ 25,826
Reversal of other allowance for doubtful accounts 37 98 2,465
Gains on government grants 301 458 269
Gains on assets contributed 1,953 9,347 24,324
Gains on liabilities exempted 1,181 1,830 1,314
Compensation and reparations revenue 89,638 104,826 95,407
Revenue from foundation fund 3 1 0
Revenue from research contracts 8,191 5,996 4,001
Income related to transfer of assets from customers 711,839 661,212 643,477
Rental income 208,064 204,123 193,567
Others of Other Income 59,017 30,694 45,798
Refund of claim for rectification 701 7,274 11,880
Adjustment of research project 0 7,638 2,150
Maintenance expenses on lease building 125 160 2,785
Training expenses 1,684 1,739 3,852
Deposit redemption 12 378 314
Reversal of expenses on litigation 1,920 991 620
Revenue on royalty fee 455 173 0
Reimbursement of insurance fee 0 1 22
Gains on guarantee contracts 22 27 134
Miscellaneous other non-operating income 54,098 12,313 24,041
Other nonoperating income 1,095,489 1,034,133 1,036,448
Other non-operating expense      
Compensation and indemnification expense 36 663 11,959
Accretion expenses of other provisions 1,138 2,711 17,991
Depreciation expenses on investment properties 486 1,386 1,453
Depreciation expenses on idle assets 3,635 3,621 6,604
Other bad debt expense 6,400 49,372 32,503
Donations 131,037 152,456 316,981
Others of Other Expense 69,418 47,723 30,229
Operating expenses related to the idle assets 1,683 44 46
Research grants 562 109 91
Expenses related to farming and fishing village supports 11,272 17,065 16,115
Expenses related to Operating of a fitness center 8,370 6,948 5,101
Expenses on adjustment of research and development grants 260 2,241 720
Taxes and dues 31,985 119 253
Expenses on R&D supports 48 861 242
Miscellaneous other non-operating expense 15,238 20,336 7,661
Other Nonoperating Expense ₩ 212,150 ₩ 257,932 ₩ 417,720