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Trade Notes and Accounts Receivable, Net - Receivables Past Due but Not Impaired (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
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 |  | 400
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 |  | 256
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 |  | 47
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 |  | 9
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 |  | 74
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 |  | 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 |  | $ 13

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