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Revenue from Contracts with Customers, Other Income and Relevant Contract Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2025
Disclosure of disaggregation of revenue from contracts with customers [abstract]  
Schedule of Revenue And Other Income in the Statement of Profit or Loss The Group has recognized the following amounts relating to revenue and other income in the statement of profit or loss:
(in millions of Korean won)202320242025
Revenue from contracts with customers₩26,063,185 ₩26,146,846 ₩27,966,493 
Revenue from other sources224,016 232,798 286,700 
Other income (Note 27)308,044 344,829 294,715 
Total revenue and other income₩26,595,245 ₩26,724,473 ₩28,547,908 
Schedule of Operating Revenues and Other Income Operating revenues and other income for the years ended December 31, 2023, 2024 and 2025 are as follows:
(in millions of Korean won)202320242025
Mobile services₩7,140,333 ₩7,318,087 ₩7,585,939 
Fixed-line services5,142,359 5,157,728 5,191,735 
Fixed-line and VoIP telephone services1,249,024 1,188,365 1,116,286 
Broadband Internet access services2,578,558 2,634,200 2,683,700 
Data communication services1,314,777 1,335,163 1,391,749 
Media and content3,206,521 3,107,444 3,085,463 
Financial services3,967,763 3,742,655 3,473,946 
Sale of goods3,292,514 3,373,686 4,864,906 
Others3,845,755 4,024,873 4,345,919 
Total₩26,595,245 ₩26,724,473 ₩28,547,908 
Schedule of Contract with Customer Assets and Liabilities Contract assets and liabilities recognized in relation to the revenues from contracts with customers, are as follows:
(in millions of Korean won)December 31,
2024		December 31,
2025
Contract assets1
₩929,181 ₩1,111,973 
Contract liabilities1
1,240,934 410,379 
Deferred revenue2
₩87,209 ₩94,302 
1The Group recognized contract assets of ₩85,713 million and contract liabilities of ₩170,641 million for long-term construction contract as of December 31, 2025 (2024: contract assets of ₩128,375 million and contract liabilities of ₩967,614 million). The Group recognizes contract assets as trade receivables and other receivables, and contract liabilities as other current liabilities.
2Deferred revenue recognized relating to government grant is excluded.
Schedule of Contract Costs Recognized as Assets The contract costs recognized as assets are as follows:
(in millions of Korean won)202320242025
Incremental cost of contract establishment₩1,656,711 ₩1,666,042 ₩2,018,168 
Cost of Contract performance70,757 72,122 80,920 
Schedule of Revenue Recognized from Carried-Forward Contract Liabilities For the years ended December 31, 2023, 2024 and 2025, revenue recognized from carried-forward contract liabilities and deferred revenue, is as follows:
(in millions of Korean won)202320242025
Revenue recognized that was included in the contract liabilities balance at the beginning of the year
Allocation of the transaction price₩213,609 ₩199,624 ₩1,128,319 
Deferred revenue of joining/installment fee41,824 41,451 41,900 
Total₩255,433 ₩241,075 ₩1,170,219