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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2025
TextBlock 1 [Abstract] |
Expense Related to Post-employment Benefit Plans under Defined Contribution Plans |
(a) | Defined contribution plans
The expenses related to post-employment benefit plans under defined contribution plans for the years ended December 31, 2023, 2024 and 2025 were as follows:
(in millions of Won) |  | 2023 |  |  | 2024 |  |  | 2025 |
Expense related to post-employment benefit plans under defined contribution plans |  | ￦ | 70,394 |  |  |  | 81,811 |  |  |  | 79,817 |
Amounts Recognized in Relation to Net Defined Benefit Liabilities in Statements of Financial Position |
(b) | Defined benefit plans
| 1) | The amounts recognized in relation to net defined benefit assets in the consolidated statements of financial position as of December 31, 2024 and 2025 are as follows:
(in millions of Won) |  | 2024 |  |  | 2025 |
Present value of funded obligations |  | ￦ | 2,589,246 |  |  |  | 2,631,811 |
Fair value of plan assets(*1) |  |  | (2,962,342 | ) |  |  | (2,923,780 | )
Present value of non-funded obligations |  |  | 7,092 |  |  |  | (4,954 | )
Net defined benefit assets |  | ￦ | (366,004 | ) |  |  | (296,923 | )
(*1) | As of December 31, 2024 and 2025, the Company recognized net defined benefit assets amounting to ￦ 409,147 million and ￦ 360,112 million, respectively, which represent the excess of each consolidated entity’s plan asset over the present value of defined benefit obligations.
Changes in Present Value of Defined Benefit Obligations and Fair Value of Plan Assets |
| 2) | Changes in present value of defined benefit obligations for the years ended December 31, 2024 and 2025 are as follows:
(in millions of Won) |  | 2024 |  |  | 2025 |
Defined benefit obligations at the beginning of year |  | ￦ | 2,476,709 |  |  |  | 2,596,338 |
Current service costs |  |  | 266,460 |  |  |  | 279,517 |
Interest costs |  |  | 93,131 |  |  |  | 87,759 |
Remeasurements : |  |  | 147,838 |  |  |  | 30,591 |
- Loss (gain) from change in financial assumptions |  |  | 92,706 |  |  |  | (8,892 | )
- Loss (gain) from change in demographic assumptions |  |  | 2,700 |  |  |  | (172 | )
- Loss from change in others |  |  | 52,432 |  |  |  | 39,655 |
Benefits paid |  |  | (336,899 | ) |  |  | (382,620 | )
Others |  |  | (50,901 | ) |  |  | 15,272 |
Defined benefit obligations at the end of year |  | ￦ | 2,596,338 |  |  |  | 2,626,857 |
| 3) | Changes in fair value of plan assets for the years ended December 31, 2024 and 2025 are as follows:
(in millions of Won) |  | 2024 |  |  | 2025 |
Fair value of plan assets at the beginning of year |  | ￦ | 2,902,714 |  |  |  | 2,962,342 |
Interest on plan assets |  |  | 112,768 |  |  |  | 103,044 |
Remeasurement of plan assets |  |  | 20,345 |  |  |  | 3,967 |
Contributions to plan assets |  |  | 251,891 |  |  |  | 225,385 |
Benefits paid |  |  | (279,304 | ) |  |  | (368,537 | )
Others |  |  | (46,072 | ) |  |  | (2,421 | )
Fair value of plan assets at the end of year |  | ￦ | 2,962,342 |  |  |  | 2,923,780 |
Fair Value of Plan Assets |
| 4) | The fair value of plan assets as of December 31, 2024 and 2025 are as follows:
(in millions of Won) |  | 2024 |  |  | 2025 |
Equity instruments |  | ￦ | 14,507 |  |  |  | 148,379 |
Debt instruments |  |  | 404,311 |  |  |  | 471,059 |
Deposits |  |  | 2,268,197 |  |  |  | 1,868,077 |
Others |  |  | 275,327 |  |  |  | 436,265 |
|  | ￦ | 2,962,342 |  |  |  | 2,923,780 |
Amounts Recognized in Consolidated Statements of Comprehensive Income |
| 5) | The amounts recognized in consolidated statements of comprehensive income for the years ended December 31, 2023, 2024 and 2025 were as follows:
(in millions of Won) |  | 2023 |  |  | 2024 |  |  | 2025 |
Current service costs |  | ￦ | 235,340 |  |  |  | 266,460 |  |  |  | 279,517 |
Net interest costs(*1) |  |  | (28,726 | ) |  |  | (19,637 | ) |  |  | (15,285 | )
|  | ￦ | 206,614 |  |  |  | 246,823 |  |  |  | 264,232 |
(*1) | The actual return on plan assets amounted to ￦ 148,786 million , ￦ 133,113 million and ￦ 107,011 million for the years ended December 31, 2023, 2024 and 2025, respectively.
The above expenses by function are as follows:
(in millions of Won) |  | 2023 |  |  | 2024 |  |  | 2025 |
Cost of sales |  | ￦ | 135,687 |  |  |  | 155,146 |  |  |  | 184,140 |
Selling and administrative expenses and others |  |  | 70,927 |  |  |  | 91,677 |  |  |  | 80,092 |
|  | ￦ | 206,614 |  |  |  | 246,823 |  |  |  | 264,232 |
Accumulated Actuarial Losses, Net of Tax Recognized in Other Comprehensive Income |
| 6) | Accumulated actuarial losses, net of tax recognized in other comprehensive income for the years ended December 31, 2023, 2024 and 2025 are as follows:
(in millions of Won) |  | 2023 |  |  | 2024 |  |  | 2025 |
Beginning |  | ￦ | (396,297 | ) |  |  | (514,845 | ) |  |  | (610,190 | )
Remeasurements of defined benefit plans |  |  | (118,548 | ) |  |  | (95,345) |  |  |  | (13,163 | )
Ending |  | ￦ | (514,845 | ) |  |  | (610,190 | ) |  |  | (623,353 | )
Principal Actuarial Assumptions |
| 7) | The principal actuarial assumptions as of December 31, 2024 and 2025 are as follows:
(%) |  | 2024 |  |  | 2025 |
Discount rate |  |  | 2.50 ~ 21.55 |  |  |  | 0.92 ~ 7.30 |
Expected future increase in salaries(*1) |  |  | 1.50 ~ 29.32 |  |  |  | 1.50 ~ 29.32 |
(*1) | The expected future increases in salaries are based on the average salary increase rate over the past five years.
Changes to Defined Benefit Obligation Due to Reasonably Possible Changes to one of the Relevant Actuarial Assumptions |
| 8) | Reasonably possible changes at the reporting date to one of the relevant actuarial assumptions, holding the other assumptions constant, would have affected the defined benefit obligation by the amounts shown below:
(in millions of Won) |  | 1% Increase |  |  | 1% Decrease |
|  | Amount |  |  | Percentage(%) |  |  | Amount |  |  | Percentage(%) |
Discount rate |  | ￦ | (164,782 | ) |  |  | (6.3 | ) |  |  | 190,289 |  |  |  | 7.2 |
Expected future increase in salaries |  |  | 186,448 |  |  |  | 7.1 |  |  |  | (165,385 | ) |  |  | (6.3 | )
Maturity of Expected Benefit Payments |
| 9) | As of December 31, 2025, the maturity of the expected benefit payments are as follows:
(in millions of Won) |  | Within 1year |  |  | 1 year - 5 years |  |  | 5 years - 10 years |  |  | 10 years - 20 years |  |  | After 20 years |  |  | Total |
Benefits to be paid |  | ￦ | 282,046 |  |  |  | 933,451 |  |  |  | 795,447 |  |  |  | 1,389,605 |  |  |  | 672,620 |  |  |  | 4,073,169 |

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