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Segment Information - Main Products and Service Revenues (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure Of Products And Services [Line Items]        
Revenues $ 229,968 $ 7,013 $ 223,199 $ 216,739
Consumer Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 139,982   137,093 132,063
Enterprise Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 75,338   73,005 72,152
International Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 9,919   9,188 7,189
Others [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 4,729   3,913 5,335
Fixed-line services [Member] | Consumer Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 42,872   42,574 42,766
Fixed-line services [Member] | Enterprise Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 33,757   33,967 34,537
Fixed-line services [Member] | International Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 5,087   5,389 5,063
Sales [Member] | Consumer Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 37,231   36,816 35,172
Sales [Member] | Others [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 3,803   3,034 4,553
Project Business [Member] | Enterprise Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 27,792   24,697 24,248
Project Business [Member] | International Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 4,016   2,841 1,506
Mobile Services [Member] | Consumer Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 57,067   55,138 51,821
Mobile Services [Member] | Enterprise Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 9,152   9,119 8,942
Others [Member] | Consumer Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 2,812   2,565 2,304
Others [Member] | Enterprise Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 4,637   5,222 4,425
Others [Member] | International Business [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues 816   958 620
Others [Member] | Others [Member]        
Disclosure Of Products And Services [Line Items]        
Revenues $ 926   $ 879 $ 782