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Lease Arrangements (Tables)
 6 Months Ended
Jun. 30, 2021
Text Block [Abstract]  
Right-of-use assets
  a.
Right-of-use
assets
 
    
December 31,

2020
       
June 30,

2021
  
    
NT$
       
NT$
  
    
(In Millions)
       
(In Millions)
  
     
Carrying amounts
                    
     
Land
    $ 25,141.9        $ 30,256.9  
Buildings
      2,544.8          2,323.8  
Machinery and equipment
      —          3.9  
Office equipment
      41.8          34.7  
    
 
 
       
 
 
  
     
     $ 27,728.5        $ 32,619.3  
    
 
 
       
 
 
  
   
    
Six Months Ended June 30
  
    
2020
       
2021
  
    
NT$
       
NT$
  
    
(In Millions)
       
(In Millions)
  
     
Additions to
right-of-use
assets
    $ 5,511.0        $ 6,220.1  
    
 
 
       
 
 
  
     
Depreciation of
right-of-use
assets
                    
Land
    $ 605.8        $ 899.4  
Buildings
      278.2          310.6  
Machinery and equipment
      581.9          0.2  
Office equipment
      12.2          10.9  
    
 
 
       
 
 
  
     
     $ 1,478.1        $ 1,221.1  
    
 
 
       
 
 
  
     
Income from subleasing
right-of-use
assets (classified under other operating income and expenses, net)
    $ 37.9        $ 40.7  
    
 
 
       
 
 
  
Lease liabilities
  b.
Lease liabilities
 
    
December 31,

2020
       
June 30,

2021
  
    
NT$
       
NT$
  
    
(In Millions)
       
(In Millions)
  
     
Carrying amounts
                    
     
Current portion (classified under accrued expenses and other current liabilities)
    $ 1,828.0        $ 1,861.3  
Noncurrent portion
      20,560.6          21,030.4  
    
 
 
       
 
 
  
     
     $ 22,388.6        $ 22,891.7  
    
 
 
       
 
 
  
Ranges of discount rates for lease liabilities
Ranges of discount rates for lease liabilities are as follows:
 
    
December 31,
2020
     
June 30,
2021
     
Land
   
0.48%-2.14%
     
0.39%-2.14%
Buildings
    0.54%-3.88%     
0.39%-3.88%
Machinery and equipment
    —      0.71%
Office equipment
    0.28%-3.88%     
0.28%-3.88%
Maturity analysis of lease payments receivable
The maturity analysis of lease payments rec
e
ivable under operating subleases is as follows:
 
     
                        
      
                        
  
    
December 31,

2020
       
June 30,

2021
  
    
NT$
       
NT$
  
    
(In Millions)
       
(In Millions)
  
     
Year 1
   
$
144.1
 
     
$
65.0
 
    
 
 
       
 
 
  
Other lease information
  e.
Other lease information
 
                                                               
    
Six Months Ended June 30
  
    
2020
       
2021
  
    
NT$
       
NT$
  
    
(In Millions)
       
(In Millions)
  
     
Expenses relating to short-term leases
   
$
1,754.8
 
     
$
2,588.9
 
    
 
 
       
 
 
  
Expenses relating to variable lease payments not included in the measurement of lease liabilities
   
$
97.2
 
     
$
101.0
 
    
 
 
       
 
 
  
Total cash outflow for leases
   
$
3,568.8
 
     
$
3,660.1