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Other Income and Expenses (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other non-operating income [Abstract]      
Reversal of other provisions ₩ 79,001 ₩ 15,265 ₩ 15,548
Reversal of other allowance for doubtful accounts 1,941 37 98
Gains on government grants 239 301 458
Gains on assets contributed 24,183 1,953 9,347
Gains on liabilities exempted 854 1,181 1,830
Compensation and reparations revenue 93,785 89,638 104,826
Revenue from foundation fund 60 3 1
Income related to transfer of assets from customers 743,051 711,839 661,212
Rental income 210,972 208,064 204,123
Others of Other Income 121,816 67,208 36,690
Refund of claim for rectification 1,054 701 7,274
Adjustment of research project 0 0 7,638
Maintenance expenses on lease building 124 125 160
Training expenses 1,946 1,684 1,739
Deposit redemption 100 12 378
Reversal of expenses on litigation 44,197 1,920 991
Revenue on royalty fee 422 455 173
Reimbursement of insurance fee 0 0 1
Gains on guarantee contracts 16 22 27
Miscellaneous other non-operating income 73,957 62,289 18,309
Other nonoperating income 1,275,902 1,095,489 1,034,133
Other non-operating expense      
Compensation and indemnification expense 34 36 663
Accretion expenses of other provisions 4,962 1,138 2,711
Depreciation expenses on investment properties 493 486 1,386
Depreciation expenses on idle assets 3,683 3,635 3,621
Other bad debt expense 40,683 6,400 49,372
Donations 169,748 131,037 152,456
Others of Other Expense 39,302 69,418 47,723
Operating expenses related to the idle assets 1,494 1,683 44
Research grants 174 562 109
Expenses related to farming and fishing village supports 13,249 11,272 17,065
Expenses related to Operating of a fitness center 8,921 8,370 6,948
Expenses on adjustment of research and development grants 388 260 2,241
Taxes and dues 1,935 31,985 119
Expenses on R&D supports 9 48 861
Miscellaneous other non-operating expense 13,132 15,238 20,336
Other Nonoperating Expense ₩ 258,905 ₩ 212,150 ₩ 257,932