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Other Income and Expenses (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other non-operating income [Abstract]      
Reversal of other provisions ₩ 35,317 ₩ 79,001 ₩ 15,265
Reversal of other allowance for doubtful accounts 17,699 1,941 37
Gains on government grants 4,789 239 301
Gains on assets contributed 29,968 24,183 1,953
Gains on liabilities exempted 504 854 1,181
Compensation and reparations revenue 84,682 93,785 89,638
Revenue from foundation fund 58 60 3
Income related to transfer of assets from customers 820,631 743,051 711,839
Rental income 204,277 210,972 208,064
Others of Other Income 100,060 121,816 67,208
Refund of claim for rectification 1,512 1,054 701
Maintenance income on lease building 109 124 125
Training income 2,486 1,946 1,684
Deposit redemption 252 100 12
Reversal of expenses on litigation 45,751 44,197 1,920
Revenue on royalty fee 0 422 455
Gains on guarantee contracts 85 16 22
Miscellaneous other non-operating income 49,865 73,957 62,289
Other nonoperating income 1,297,985 1,275,902 1,095,489
Other non-operating expense      
Compensation and indemnification expense 234 34 36
Accretion expenses of other provisions 5,841 4,962 1,138
Depreciation expenses on investment properties 682 493 486
Depreciation expenses on idle assets 3,642 3,683 3,635
Other bad debt expense 42,776 40,683 6,400
Donations 324,694 169,748 131,037
Others of Other Expense 87,819 39,302 69,418
Operating expenses related to the idle assets 1,741 1,494 1,683
Research grants 662 174 562
Expenses related to farming and fishing village supports 15,344 13,249 11,272
Expenses related to Operating of a fitness center 10,116 8,921 8,370
Expenses on adjustment of research and development grants 392 388 260
Taxes and dues 18,065 1,935 31,985
Expenses on R&D supports 41 9 48
Miscellaneous other non-operating expense 41,458 13,132 15,238
Other Nonoperating Expenses ₩ 465,688 ₩ 258,905 ₩ 212,150