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Segment Information - Analysis by Reportable Segment of Revenue and Operating Results of Continuing Operations (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 Operating Segments [Line Items]        
Revenues $ 229,968 $ 7,013 $ 223,199 $ 216,739
Income before income tax 47,841 $ 1,459 47,008 47,204
From External Customers [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 229,968   223,199 216,739
Intersegment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 5,132   5,041 4,330
Consolidated [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 229,968   223,199 216,739
Segment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 235,100   228,240 221,069
Intersegment Elimination [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues (5,132)   (5,041) (4,330)
Consumer Business [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 139,982   137,093 132,063
Income before income tax 29,771   28,907 28,505
Consumer Business [Member] | From External Customers [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 139,982   137,093 132,063
Consumer Business [Member] | Intersegment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 2,765   2,626 2,166
Consumer Business [Member] | Segment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 142,747   139,719 134,229
Enterprise Business [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 75,338   73,005 72,152
Income before income tax 12,881   14,363 15,607
Enterprise Business [Member] | From External Customers [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 75,338   73,005 72,152
Enterprise Business [Member] | Intersegment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 884   1,014 952
Enterprise Business [Member] | Segment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 76,222   74,019 73,104
International Business [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 9,919   9,188 7,189
Income before income tax 2,383   2,141 1,694
International Business [Member] | From External Customers [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 9,919   9,188 7,189
International Business [Member] | Intersegment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 1,107   995 864
International Business [Member] | Segment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 11,026   10,183 8,053
Other [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 4,729   3,913 5,335
Income before income tax 2,806   1,597 1,398
Other [Member] | From External Customers [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 4,729   3,913 5,335
Other [Member] | Intersegment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 376   406 348
Other [Member] | Segment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues $ 5,105   $ 4,319 $ 5,683