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Segment Information - Main Products and Service Revenues (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure Of Products And Services [Line Items]        
Revenues $ 223,199 $ 7,289 $ 216,739 $ 210,478
Consumer Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 137,093   132,063 129,912
Enterprise Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 73,005   72,152 69,258
International Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 9,188   7,189 6,122
Others [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 3,913   5,335 5,186
Fixed-line services [Member] | Consumer Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 42,574   42,766 42,277
Fixed-line services [Member] | Enterprise Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 33,967   34,537 34,712
Fixed-line services [Member] | International Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 5,389   5,063 5,008
Sales [Member] | Consumer Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 36,816   35,172 36,145
Sales [Member] | Others [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 3,034   4,553 4,335
Project Business [Member] | Enterprise Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 24,697   24,248 22,299
Project Business [Member] | International Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 2,841   1,506 679
Mobile Services [Member] | Consumer Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 55,138   51,821 49,043
Mobile Services [Member] | Enterprise Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 9,119   8,942 8,446
Others [Member] | Consumer Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 2,565   2,304 2,447
Others [Member] | Enterprise Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 5,222   4,425 3,801
Others [Member] | International Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 958   620 435
Others [Member] | Others [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues $ 879   $ 782 $ 851