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Net Revenue (Tables)
 12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Summary of Disaggregation of Revenue from Contracts with Customers
 a.
Disaggregation of revenue from contracts with customers
 
   
Years Ended December 31
 
   
2018
   
2019
   
2020
 
   
NT$
   
NT$
   
NT$
 
Product
  
(In Millions)
   
(In Millions)
   
(In Millions)
 
    
Wafer
  $911,296.4   $927,317.3   $1,178,456.3 
Others
   120,177.2    142,668.1    160,798.5 
   
 
 
   
 
 
   
 
 
 
    
   $1,031,473.6   $1,069,985.4   $1,339,254.8 
   
 
 
   
 
 
   
 
 
 
  
 
  
Years Ended December 31
 
 
  
2018
 
  
2019
 
  
2020
 
 
  
NT$
 
  
NT$
 
  
NT$
 
Geography
  
(In Millions)
 
  
(In Millions)
 
  
(In Millions)
 
    
Taiwan
  
$
78,260.8
 
  
$
84,255.2
 
  
$
129,082.9
 
United States
  
 
632,821.5
 
  
 
634,713.0
 
  
 
817,911.0
 
China
  
 
175,794.2
 
  
 
208,101.4
 
  
 
233,783.3
 
Europe, the Middle East and Africa
  
 
71,068.5
 
  
 
67,568.2
 
  
 
70,213.4
 
Japan
  
 
58,125.9
 
  
 
57,468.6
 
  
 
63,299.2
 
Others
  
 
15,402.7
 
  
 
17,879.0
 
  
 
24,965.0
 
 
  
 
 
 
  
 
 
 
  
 
 
 
    
 
  
$
1,031,473.6
 
  
$
1,069,985.4
 
  
$
1,339,254.8
 
 
  
 
 
 
  
 
 
 
  
 
 
 
The Company categorized the net revenue mainly based on the countries where the customers are headquartered.
 
   
Years Ended December 31
 
   
2018
   
2019
   
2020
 
   
NT$
   
NT$
   
NT$
 
Platform
  
(In Millions)
   
(In Millions)
   
(In Millions)
 
    
Smartphone
  $466,452.3   $523,612.9   $645,303.6 
High Performance Computing
   341,910.2    315,822.3    439,810.0 
Internet of Things
   65,091.3    86,342.7    110,355.2 
Automotive
   51,709.8    47,914.5    44,367.5 
Digital Consumer Electronics
   58,470.2    53,733.4    54,555.7 
Others
   47,839.8    42,559.6    44,862.8 
   
 
 
   
 
 
   
 
 
 
    
   $1,031,473.6   $1,069,985.4   $1,339,254.8 
   
 
 
   
 
 
   
 
 
 
 
   
Years Ended December 31
 
   
2018
   
2019
   
2020
 
   
NT$
   
NT$
   
NT$
 
Resolution
  
(In Millions)
   
(In Millions)
   
(In Millions)
 
    
5-nanometer
  $—   $—   $90,934.5 
7-nanometer
   81,680.7    249,548.1    394,837.0 
10-nanometer
   96,989.5    23,266.4    3,403.1 
16-nanometer
   187,370.6    186,700.9    197,959.0 
20-nanometer
   23,618.4    9,535.8    8,450.9 
28-nanometer
   178,440.4    149,578.7    149,367.7 
40/45-nanometer
   101,801.0    93,366.3    103,176.5 
65-nanometer
   76,122.3    69,250.0    61,226.7 
90-nanometer
   36,652.1    25,624.2    29,380.4 
0.11/0.13 micron
   20,677.7    22,947.3    33,197.1 
0.15/0.18 micron
   81,182.6    77,564.5    86,008.5 
0.25 micron and above
   26,761.1    19,935.1    20,514.9 
   
 
 
   
 
 
   
 
 
 
    
Wafer revenue
  $911,296.4   $927,317.3   $1,178,456.3 
   
 
 
   
 
 
   
 
 
 
Summary of Contract Balances
 b.
Contract balances
 
   
January 1,

2019
   
December 31,

2019
   
December 31,

2020
 
   
NT$
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
   
(In Millions)
 
    
Contract liabilities (classified under accrued expenses and other current liabilities)
  $4,684.0   $6,784.3   $13,775.1