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Net Defined Benefit Liabilities (Assets)
 12 Months Ended
Dec. 31, 2025
Disclosure of net defined benefit liability (asset) [abstract]  
Net Defined Benefit Liabilities (Assets) Net Defined Benefit Liabilities (Assets)
(1)    The amounts recognized in the statements of financial position as of December 31, 2024 and 2025, are determined as follows:
(In millions of Korean won)December 31, 2024December 31, 2025
Present value of defined benefit obligations₩2,232,898 2,306,248 
Fair value of plan assets(2,153,792)(2,292,457)
Liabilities₩128,457 85,631 
Assets₩49,351 71,840 
(2)    Changes in the defined benefit obligations for the years ended December 31, 2024 and 2025, are as follows:
(In millions of Korean won)20242025
Beginning₩2,365,793 ₩2,232,898 
Current service cost224,071 231,838 
Interest expense88,882 69,015 
Benefit paid(626,899)(221,458)
Changes due to settlements of plan & Past Service Cost3,054 4,500 
Remeasurements on defined benefit obligations:
Actuarial gains (losses) arising from changes in demographic assumptions11,531 (857)
Actuarial gains (losses) arising from changes in financial assumptions90,373 (53,848)
Actuarial gains arising from experience adjustments57,699 57,692 
Acquisition and disposition of businesses, etc18,394 (13,532)
Ending₩2,232,898 2,306,248 
(3)    Changes in the fair value of plan assets for the years ended December 31, 2024 and 2025, are as follows:
(In millions of Korean won)20242025
Beginning₩2,462,925 ₩2,153,792 
Interest income97,708 72,685 
Remeasurements:
Return on plan assets (excluding amounts included in interest income)(154)995 
Benefits paid(583,162)(190,569)
Employer contributions172,622 269,591 
Acquisition and disposition of businesses, etc.3,853 (14,037)
Ending₩2,153,792 ₩2,292,457 
(4)    Amounts recognized in the consolidated statement of profit or loss for the years ended December 31, 2023, 2024 and 2025, are as follows:
(in millions of Korean won)202320242025
Current service cost₩213,922 ₩224,071 ₩231,837 
Net Interest cost(17,462)(8,826)(3,670)
Changes due to settlements of plan & Past Service Cost1 (13,059)(13,428)
Transfer in(out)(13,435)19,191 4,481 
Total expenses₩183,026 ₩221,377 ₩219,220 
(5)    Principal actuarial assumptions used are as follows:
December 31,
2023		December 31,
2024		December 31,
2025
Discount rate
3.67%~5.51%
3.24%~5.02%
3.29%~5.32%
Salary growth rate
1.7%~8.96%
1.66%~8.96%
1.98%~6.50%
(6)    The sensitivity of the defined benefit obligations as of December 31, 2025, to changes in the principal assumptions is:
(in percentage, in millions of Korean won)Effect on defined benefit obligation
Changes in
assumption		Increase in
assumption		Decrease in
assumption
Discount rate
0.5% point
₩(72,199)₩78,104 
Salary growth rate
0.5% point
75,203 (70,258)
A decrease in corporate bond yields will increase plan liabilities, although this will be partially offset by an increase in the value of the plans’ bond holdings.
The above sensitivity analysis is based on changes in assumption while holding all other assumptions constant. In practice, this is unlikely to occur, and changes in some of the assumptions may be correlated. The sensitivity of the defined benefit obligation to changes in principal actuarial assumptions is calculated using the projected unit credit method, the same method applied when calculating the defined benefit obligations recognized on the statement of financial position.
(7)    Effect of defined benefit plan on future cash flows
The Group actively monitors how the duration and the expected yield of the investments match the expected cash outflows arising from the pension obligations. Expected contributions to post-employment benefit plans, for the year ending December 31, 2026, are ₩262,365 million.
The expected maturity analysis of undiscounted pension benefits as of December 31, 2025, is as follows:
(in millions of Korean won)Less than
1 year		Between
1-2 years		Between
2-5 years		Over 5 yearsTotal
Pension benefits₩310,424 ₩344,185 ₩789,356 ₩2,199,824 ₩3,643,789 
(8)    The weighted average duration of the defined benefit obligations is 6.7 years.