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Trade Notes and Accounts Receivable, Net - Aging Analysis for Trade Notes and Accounts Receivable (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable $ 31,941 $ 1,077 $ 31,022
Gross carrying amount [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable 34,058   32,795
Gross carrying amount [Member] | Non-overdue [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable 30,032   29,596
Gross carrying amount [Member] | Less than 30 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable 1,280   1,050
Gross carrying amount [Member] | 31-60 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable 485   348
Gross carrying amount [Member] | 61-90 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable 278   286
Gross carrying amount [Member] | 91-120 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable 253   198
Gross carrying amount [Member] | 121-180 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable 122   119
Gross carrying amount [Member] | More than 181 days [Member]      
Disclosure of financial assets that are either past due or impaired [Line Items]      
Trade notes and accounts receivable $ 1,608   $ 1,198