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Trade Notes and Accounts Receivable, Net - Receivables Past Due but Not Impaired (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable $ 30,076 $ 983 $ 31,941
Receivables past due but not impaired [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable     449
Receivables past due but not impaired [Member] | Less than 30 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable     328
Receivables past due but not impaired [Member] | 31-60 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable     36
Receivables past due but not impaired [Member] | 61-90 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable     7
Receivables past due but not impaired [Member] | 91-120 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable     70
Receivables past due but not impaired [Member] | 121-180 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable     1
Receivables past due but not impaired [Member] | More than 181 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable     $ 7