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Net Revenue - Summary of Disaggregation of Revenue from Contracts with Customers Based on Platform Type (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers $ 1,339,254.8 $ 1,069,985.4 $ 1,031,473.6
Smartphone [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 645,303.6 523,612.9 466,452.3
High performance computing [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 439,810.0 315,822.3 341,910.2
Internet of things [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 110,355.2 86,342.7 65,091.3
Automotive [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 44,367.5 47,914.5 51,709.8
Digital consumer electronics [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 54,555.7 53,733.4 58,470.2
Others [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers $ 44,862.8 $ 42,559.6 $ 47,839.8