XML 118 R102.htm IDEA: XBRL DOCUMENT v3.22.1
Trade Notes and Accounts Receivable, Net - Provision Matrix Arising from Telecommunications and Project Business (Detail)
$ in Millions, $ in Millions
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Jan. 01, 2020
TWD ($)
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 23,947 $ 863 $ 22,622 $ 26,408
Less: Loss allowance (1,605)   (2,154)  
Gross carrying amount [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable 25,552   24,776  
Telecommunications Business [Member] | Loss allowance [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Less: Loss allowance (789)   (797)  
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 17,485   16,806  
Telecommunications Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 16,696   16,009  
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 $ (784)   (1,320)  
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 4,781   4,866  
Project Business [Member] | Amortized Cost [Member]        
Disclosure of financial assets that are either past due or impaired [Line Items]        
Trade notes and accounts receivable $ 3,997   $ 3,546  
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% 2.00%  
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)   $ (56)  
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 16,411   15,839  
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 $ 16,360   $ 15,783  
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 $ (8)   $ (20)  
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 3,988   3,473  
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 $ 3,980   $ 3,453  
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% 2.00%  
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% 24.00%  
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 $ (23)   $ (21)  
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 282   204  
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 $ 259   $ 183  
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 $ 0   $ (3)  
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 0   64  
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 $ 0   $ 61  
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 62.00% 62.00% 68.00%  
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)   $ (24)  
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 82   51  
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 $ 53   $ 27  
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)   $ (3)  
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 7   27  
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 $ 6   $ 24  
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% 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 80.00% 80.00% 83.00%  
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 $ (30)   $ (25)  
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 45   31  
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 $ 15   $ 6  
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 $ (4)   $ (3)  
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 14   9  
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 $ 10   $ 6  
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 25.00% 25.00% 28.00%  
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 90.00% 90.00% 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 $ (25)   $ (24)  
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 31   30  
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 $ 6   $ 6  
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 $ 0   $ (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 0   2  
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   $ 1  
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 49.00% 49.00% 52.00%  
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 97.00% 97.00% 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 $ (28)   $ (21)  
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 31   25  
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 $ 3   $ 4  
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 $ (1)   $ (2)  
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 2   3  
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 $ (603)   $ (626)  
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 603   626  
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 $ (770)   $ (1,288)  
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 770   1,288  
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