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Employment Benefits (Tables)
12 Months Ended
Dec. 31, 2022
Disclosure of information about defined benefit plans [abstract]  
Summary of Employment Benefits
(1)
Employment benefit obligations as of December 31, 2021 and 2022 are as follows:
 
           
2021
    
2022
 
                      
           
In millions of won
 
Net defined benefit asset
            20,871         198,626  
Net defined benefit obligations
              1,675,741        825,927  
Other long-term employee benefit obligations
              3,417        2,794  
Summary of Principal Assumptions on Actuarial Valuation
(2)
Principal assumptions used for actuarial valuation as of December 31, 2021 and 2022 are as follows:
 
    
2021
  
2022
           
Discount rate
   2.51%~2.60%    5.16%~5.19%
Future salary and benefit levels
   4.28%    4.55%
Weighted average duration
   10.39 years    8.84 years
Summary of Expense Relating to defined Benefit Plans
(3)
Details of expense relating to defined benefit plans for the years ended December 31, 2020, 2021 and 2022 are as follows:
 
           
2020
    
2021
    
2022
 
                             
           
In millions of won
 
Current service cost
            509,520        524,942        496,722  
Interest cost
              83,248        91,877        116,256  
Expected return on plan assets
              (42,742      (52,782      (73,484
Past service cost
              (2,027      5,483        125  
Loss from settlement
              —          —           —  
             
 
 
    
 
 
    
 
 
 
              547,999        569,520        539,619  
             
 
 
    
 
 
    
 
 
 
Expenses described above are recognized in those items below in the consolidated financial statements.
 
           
2020
    
2021
    
2022
 
                             
           
In millions of won
 
Cost of sales
            397,442        416,287        404,243  
Selling and administrative expenses
              94,846        95,983        81,457  
Others
(Construction-in-progress
and others)
              55,711         57,250         53,919  
             
 
 
    
 
 
    
 
 
 
              547,999        569,520        539,619  
             
 
 
    
 
 
    
 
 
 
Summary of Defined Benefits
(4)
Details of defined benefit obligations as of December 31, 2021 and 2022 are as follows:
 
           
2021
    
2022
 
                      
           
In millions of won
 
Present value of defined benefit obligation from funded plans
            4,564,417        3,776,715  
Fair value of plan assets
              (2,909,547      (3,149,414
             
 
 
    
 
 
 
Net liabilities incurred from defined benefit plans
            1,654,870        627,301  
             
 
 
    
 
 
 
Summary of Changes in the Present Value of Defined Benefits
(5)
Changes in the present value of defined benefit obligations for the years ended December 31, 2021 and 2022 are as follows:
 
           
2021
    
2022
 
                      
           
In millions of won
 
Beginning balance
            4,570,614        4,564,417  
Current service cost
              524,942        496,722  
Interest cost
              91,877        116,256  
Remeasurement component
              (345,755      (1,012,727
Past service cost
              5,483        125  
Actual payments
              (282,794      (388,105
Others
              50        27  
             
 
 
    
 
 
 
Ending balance
             4,564,417        3,776,715  
             
 
 
    
 
 
 
Summary of Changes in the Fair Value of Plan Assets
(6)
Changes in the fair value of plan assets for the years ended December 31, 2021 and 2022 are as follows:
 
           
2021
    
2022
 
                      
           
In millions of won
 
Beginning balance
            2,670,832        2,909,547  
Expected return
              52,782        73,484  
Remeasurement component
              (8,457      (11,609
Contributions by the employers
              317,707        347,778  
Actual payments
              (123,317      (169,786
             
 
 
    
 
 
 
Ending balance
             2,909,547         3,149,414  
             
 
 
    
 
 
 
Summary of the Fair Value of Plan Assets
(7)
Details of the fair value of plan assets as of December 31, 2021 and 2022 are as follows:
 
           
2021
    
2022
 
                      
           
In millions of won
 
Equity instruments
            344,002        171,301  
Debt instruments
              744,167        854,640  
Bank deposits
              407,809        590,103  
Others
 (*)
              1,413,569        1,533,370  
             
 
 
    
 
 
 
               2,909,547         3,149,414  
             
 
 
    
 
 
 

(*)
‘Others’ consist of various financial assets managed by external asset management companies.
Summary of Remeasurement Components Recognized in Other Comprehensive Income (loss)
(8)
Remeasurement components recognized in other comprehensive income (loss) for the years ended December 31, 2021 and 2022 are as follows:
 
           
2021
    
2022
 
                      
           
In millions of won
 
Actuarial gain from changes in financial assumptions
            (258,194      (967,366
Experience adjustments, etc.
              (87,561      (45,361
Expected return
                     8,457        11,609  
             
 
 
    
 
 
 
              (337,298      (1,001,118