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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, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure Of Operating Segments [Line Items]        
Revenues $ 223,199 $ 7,289 $ 216,739 $ 210,478
Income before income tax 47,008 $ 1,535 47,204 46,067
From External Customers [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 223,199   216,739 210,478
Intersegment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 5,041   4,330 5,851
Consolidated [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 223,199   216,739 210,478
Segment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 228,240   221,069 216,329
Intersegment Elimination [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues (5,041)   (4,330) (5,851)
Consumer Business [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 137,093   132,063 129,912
Income before income tax 28,907   28,505 27,528
Consumer Business [Member] | From External Customers [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 137,093   132,063 129,912
Consumer Business [Member] | Intersegment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 2,626   2,166 2,857
Consumer Business [Member] | Segment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 139,719   134,229 132,769
Enterprise Business [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 73,005   72,152 69,258
Income before income tax 14,363   15,607 15,094
Enterprise Business [Member] | From External Customers [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 73,005   72,152 69,258
Enterprise Business [Member] | Intersegment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 1,014   952 1,693
Enterprise Business [Member] | Segment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 74,019   73,104 70,951
International Business [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 9,188   7,189 6,122
Income before income tax 2,141   1,694 1,246
International Business [Member] | From External Customers [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 9,188   7,189 6,122
International Business [Member] | Intersegment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 995   864 961
International Business [Member] | Segment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 10,183   8,053 7,083
Other [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 3,913   5,335 5,186
Income before income tax 1,597   1,398 2,199
Other [Member] | From External Customers [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 3,913   5,335 5,186
Other [Member] | Intersegment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues 406   348 340
Other [Member] | Segment [Member]        
Disclosure Of Operating Segments [Line Items]        
Revenues $ 4,319   $ 5,683 $ 5,526