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Trade Notes and Accounts Receivable, Net - Provision Matrix Arising from Telecommunications and Project Business (Detail)
$ in Millions, $ in Millions
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 26,026 $ 794 $ 24,842 $ 24,672
Less: Loss allowance 1,143   1,102  
Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 27,169   25,944  
Telecommunications Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance 813   765  
Telecommunications Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 17,730   18,292  
Telecommunications Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 16,917   17,527  
Project Business [Member] | Bottom of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 50.00% 50.00%    
Project Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 295   314  
Project Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 5,959   4,289  
Project Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 5,664   $ 3,975  
Not Past Due [Member] | Telecommunications Business [Member] | Bottom of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 0.00% 0.00% 0.00%  
Not Past Due [Member] | Telecommunications Business [Member] | Top of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 1.00% 1.00% 1.00%  
Not Past Due [Member] | Telecommunications Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 51   $ 50  
Not Past Due [Member] | Telecommunications Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 16,477   17,066  
Not Past Due [Member] | Telecommunications Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 16,426   $ 17,016  
Not Past Due [Member] | Project Business [Member] | Bottom of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 0.00% 0.00% 0.00%  
Not Past Due [Member] | Project Business [Member] | Top of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 5.00% 5.00% 5.00%  
Not Past Due [Member] | Project Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 3   $ 3  
Not Past Due [Member] | Project Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 5,548   3,869  
Not Past Due [Member] | Project Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 5,545   $ 3,866  
Less Than 30 Days [Member] | Telecommunications Business [Member] | Bottom of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 1.00% 1.00% 1.00%  
Less Than 30 Days [Member] | Telecommunications Business [Member] | Top of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 22.00% 22.00% 20.00%  
Less Than 30 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 24   $ 22  
Less Than 30 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 335   346  
Less Than 30 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 311   $ 324  
Less Than 30 Days [Member] | Project Business [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 5.00% 5.00% 5.00%  
Less Than 30 Days [Member] | Project Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 2   $ 17  
Less Than 30 Days [Member] | Project Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 44   101  
Less Than 30 Days [Member] | Project Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 42   $ 84  
31-60 Days [Member] | Telecommunications Business [Member] | Bottom of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 2.00% 2.00% 3.00%  
31-60 Days [Member] | Telecommunications Business [Member] | Top of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 68.00% 68.00% 65.00%  
31-60 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 34   $ 29  
31-60 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 139   135  
31-60 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 105   $ 106  
31-60 Days [Member] | Project Business [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 10.00% 10.00% 10.00%  
31-60 Days [Member] | Project Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 8   $ 1  
31-60 Days [Member] | Project Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 83   12  
31-60 Days [Member] | Project Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 75   $ 11  
61-90 Days [Member] | Telecommunications Business [Member] | Bottom of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 11.00% 11.00% 12.00%  
61-90 Days [Member] | Telecommunications Business [Member] | Top of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 84.00% 84.00% 82.00%  
61-90 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 31   $ 29  
61-90 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 75   70  
61-90 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 44   $ 41  
61-90 Days [Member] | Project Business [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 30.00% 30.00% 30.00%  
61-90 Days [Member] | Project Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 1   $ 5  
61-90 Days [Member] | Project Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 3   18  
61-90 Days [Member] | Project Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 2   $ 13  
91-120 Days [Member] | Telecommunications Business [Member] | Bottom of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 21.00% 21.00% 23.00%  
91-120 Days [Member] | Telecommunications Business [Member] | Top of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 92.00% 92.00% 91.00%  
91-120 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 33   $ 35  
91-120 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 50   48  
91-120 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 17   $ 13  
91-120 Days [Member] | Project Business [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 50.00% 50.00% 50.00%  
91-120 Days [Member] | Project Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 1   $ 1  
91-120 Days [Member] | Project Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 1   1  
91-120 Days [Member] | Project Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 0   $ 0  
121-180 Days [Member] | Telecommunications Business [Member] | Bottom of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 39.00% 39.00% 40.00%  
121-180 Days [Member] | Telecommunications Business [Member] | Top of Range [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 96.00% 96.00% 96.00%  
121-180 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 34   $ 22  
121-180 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 48   49  
121-180 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 14   $ 27  
121-180 Days [Member] | Project Business [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 80.00% 80.00% 80.00%  
121-180 Days [Member] | Project Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 0   $ 0  
121-180 Days [Member] | Project Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 0   1  
121-180 Days [Member] | Project Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 0   $ 1  
Over 180 Days [Member] | Telecommunications Business [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 100.00% 100.00% 100.00%  
Over 180 Days [Member] | Telecommunications Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 606   $ 578  
Over 180 Days [Member] | Telecommunications Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 606   578  
Over 180 Days [Member] | Telecommunications Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 0   $ 0  
Over 180 Days [Member] | Project Business [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Expected credit loss rate 100.00% 100.00% 100.00%  
Over 180 Days [Member] | Project Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance $ 280   $ 287  
Over 180 Days [Member] | Project Business [Member] | Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 280   287  
Over 180 Days [Member] | Project Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 0   $ 0