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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, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 24,842 $ 811 $ 24,672 $ 23,947
Less: Loss allowance (1,102)   (1,365)  
Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 25,944   26,037  
Telecommunications Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance (765)   (761)  
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 18,292   18,254  
Telecommunications Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 17,527   17,493  
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 $ (314)   (575)  
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 4,289   4,531  
Project Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 3,975   $ 3,956  
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 $ (50)   $ (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 17,066   17,163  
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 $ 17,016   $ 17,113  
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 3,869   3,798  
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 $ 3,866   $ 3,795  
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 20.00% 20.00% 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 $ (22)   $ (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 346   310  
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 $ 324   $ 288  
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 $ (17)   $ (6)  
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 101   119  
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 $ 84   $ 113  
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 3.00% 3.00% 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 65.00% 65.00% 64.00%  
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 $ (29)   $ (20)  
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 135   87  
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 $ 106   $ 67  
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 $ (1)   $ (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 12   11  
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 $ 11   $ 10  
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 12.00% 12.00% 11.00%  
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 82.00% 82.00% 80.00%  
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 $ (29)   $ (21)  
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 70   33  
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 $ 41   $ 12  
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 $ (5)   $ (16)  
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 18   53  
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 $ 13   $ 37  
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 23.00% 23.00% 25.00%  
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 91.00% 91.00% 90.00%  
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 $ (35)   $ (20)  
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 48   28  
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 $ 13   $ 8  
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 40.00% 40.00% 45.00%  
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 $ (22)   $ (29)  
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 49   34  
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 $ 27   $ 5  
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   $ (1)  
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 1   2  
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 $ 1   $ 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 $ (578)   $ (599)  
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 578   599  
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 $ (287)   $ (547)  
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 287   547  
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