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Application Of New And Revised International Financial Reporting Standards (IFRS), International Accounting Standards (IAS), IFRIC Interpretations (IFRIC), And SIC Interpretations (SIC) Issued By The International Accounting Standards Board (IASB) - Summary of Anticipated Impact on Assets, Liabilities and Equity when Retrospectively Applying IFRS 9 and IFRS 15 (Detail) $ in Millions, $ in Millions | Jan. 01, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($) | Dec. 31, 2014 TWD ($)
--- | --- | --- | --- | --- | --- | ---
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Hedging instruments |  | $ 34.4 | $ 1.2 | $ 5.6 |  |
Financial assets |  | 804,091.0 |  | 790,858.6 |  |
Financial assets |  | 804,091.0 |  | 790,858.6 |  |
Financial liabilities |  | 340,543.5 |  | 387,237.3 |  |
Inventories |  | 73,880.7 | 2,492.6 | 48,682.2 |  |
Other financial assets-current |  | 7,253.1 | 244.7 | 4,100.5 |  |
Investments accounted for using equity method |  | 17,731.8 | 598.2 | 19,585.3 |  |
TOTAL |  | 1,991,732.0 | 67,197.4 | 1,886,296.7 |  |
Accrued expenses and other current liabilities |  | 65,588.4 | 2,212.8 | 36,581.6 |  |
Total liabilities |  | 497,285.5 | 16,777.5 | 526,450.9 |  |
Retained earnings |  | 1,205,051.3 | 40,656.3 | 1,041,810.7 |  |
NON-CONTROLLING INTERESTS |  | 699.7 | 23.6 | 795.1 |  |
Total equity |  | 1,494,446.5 | $ 50,419.9 | $ 1,359,845.8 | $ 1,194,970.1 | $ 1,022,360.7
IFRS 9 [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at amortized cost | $ 705,474.8 |  |  |  |  |
Hedging instruments | 34.4 |  |  |  |  |
Financial assets | 805,294.6 |  |  |  |  |
Retained Earnings Effect | 1,490.3 |  |  |  |  |
Financial assets | 805,294.6 |  |  |  |  |
Other Equity Effect | (285.1) |  |  |  |  |
Financial assets at fair value through profit or loss | 1,349.3 |  |  |  |  |
Financial assets at fair value through other comprehensive income | 98,436.1 |  |  |  |  |
Investments accounted for using equity method | 17,740.1 |  |  |  |  |
IFRS 9 [Member] | Add: From loans and receivables [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at amortized cost | 684,661.4 |  |  |  |  |
IFRS 9 [Member] | Add: From held to maturity [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at amortized cost | 20,813.4 |  |  |  |  |
IFRS 9 [Member] | Investments accounted for using equity method [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Retained Earnings Effect | 34.0 |  |  |  |  |
Other Equity Effect | (25.7) |  |  |  |  |
IFRS 9 [Member] | Amortized cost [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Retained Earnings Effect | 236.5 |  |  |  |  |
IFRS 9 [Member] | Amortized cost [Member] | Add: From loans and receivables [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Retained Earnings Effect | 244.8 |  |  |  |  |
IFRS 9 [Member] | Amortized cost [Member] | Add: From held to maturity [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Retained Earnings Effect | (8.3) |  |  |  |  |
IFRS 9 [Member] | FVTOCI [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Retained Earnings Effect | 1,263.9 |  |  |  |  |
Other Equity Effect | (295.2) |  |  |  |  |
IFRS 9 [Member] | FVTPL [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Retained Earnings Effect | (10.1) |  |  |  |  |
Other Equity Effect | 10.1 |  |  |  |  |
IFRS 9 [Member] | Adjustments arising from initial application [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Investments accounted for using equity method | 8.3 |  |  |  |  |
IFRS 9 [Member] | Previously stated under IAS 39 [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Hedging instruments |  | 34.4 |  |  |  |
Financial assets |  | 604.2 |  |  |  |
Financial assets |  | 604.2 |  |  |  |
Financial assets at fair value through profit or loss |  | 569.8 |  |  |  |
Investments accounted for using equity method |  | 17,731.8 |  |  |  |
IFRS 9 [Member] | Reclassifications [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at amortized cost | 705,238.3 |  |  |  |  |
Financial assets | 803,486.8 |  |  |  |  |
Financial assets | 803,486.8 |  |  |  |  |
Financial assets at fair value through profit or loss | 779.5 |  |  |  |  |
Financial assets at fair value through other comprehensive income | 97,469.0 |  |  |  |  |
IFRS 9 [Member] | Reclassifications [Member] | Add: From loans and receivables [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at amortized cost | 684,416.6 |  |  |  |  |
IFRS 9 [Member] | Reclassifications [Member] | Add: From held to maturity [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at amortized cost | 20,821.7 |  |  |  |  |
IFRS 9 [Member] | Remeasurements [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at amortized cost | 236.5 |  |  |  |  |
Financial assets | 1,203.6 |  |  |  |  |
Financial assets | 1,203.6 |  |  |  |  |
Financial assets at fair value through other comprehensive income | 967.1 |  |  |  |  |
IFRS 9 [Member] | Remeasurements [Member] | Add: From loans and receivables [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at amortized cost | 244.8 |  |  |  |  |
IFRS 9 [Member] | Remeasurements [Member] | Add: From held to maturity [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at amortized cost | (8.3) |  |  |  |  |
IFRS 9 [Member] | Adjustments Arising from Initial Application [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Investments accounted for using equity method | 8.3 |  |  |  |  |
IFRS 9 [Member] | Equity securities [Member] | Add: From available for sale [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at fair value through other comprehensive income | 8,389.5 |  |  |  |  |
IFRS 9 [Member] | Equity securities [Member] | FVTOCI [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 8,389.5 |  |  |  |  |
Financial assets | 8,389.5 |  |  |  |  |
IFRS 9 [Member] | Equity securities [Member] | FVTOCI [Member] | Add: From available for sale [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Retained Earnings Effect | 1,294.6 |  |  |  |  |
Other Equity Effect | (325.9) |  |  |  |  |
IFRS 9 [Member] | Equity securities [Member] | Reclassifications [Member] | Add: From available for sale [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at fair value through other comprehensive income | 7,422.4 |  |  |  |  |
IFRS 9 [Member] | Equity securities [Member] | Remeasurements [Member] | Add: From available for sale [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at fair value through other comprehensive income | 967.1 |  |  |  |  |
IFRS 9 [Member] | Cash and cash equivalents [Member] | Amortized cost [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 553,391.7 |  |  |  |  |
Financial assets | 553,391.7 |  |  |  |  |
IFRS 9 [Member] | Derivative financial assets [Member] | Mandatorily at FVTPL [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 569.8 |  |  |  |  |
Financial assets | 569.8 |  |  |  |  |
IFRS 9 [Member] | Derivative financial assets [Member] | Hedging instruments [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 34.4 |  |  |  |  |
Financial assets | 34.4 |  |  |  |  |
IFRS 9 [Member] | Debt securities [Member] | Add: From available for sale [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at fair value through profit or loss | 779.5 |  |  |  |  |
Financial assets at fair value through other comprehensive income | 90,046.6 |  |  |  |  |
IFRS 9 [Member] | Debt securities [Member] | Amortized cost [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 20,813.4 |  |  |  |  |
Financial assets | 20,813.4 |  |  |  |  |
IFRS 9 [Member] | Debt securities [Member] | FVTOCI [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 90,046.6 |  |  |  |  |
Financial assets | 90,046.6 |  |  |  |  |
IFRS 9 [Member] | Debt securities [Member] | FVTOCI [Member] | Add: From available for sale [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Retained Earnings Effect | (30.7) |  |  |  |  |
Other Equity Effect | 30.7 |  |  |  |  |
IFRS 9 [Member] | Debt securities [Member] | Mandatorily at FVTPL [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 779.5 |  |  |  |  |
Financial assets | 779.5 |  |  |  |  |
IFRS 9 [Member] | Debt securities [Member] | FVTPL [Member] | Add: From available for sale [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Retained Earnings Effect | (10.1) |  |  |  |  |
Other Equity Effect | 10.1 |  |  |  |  |
IFRS 9 [Member] | Debt securities [Member] | Reclassifications [Member] | Add: From available for sale [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets at fair value through profit or loss | 779.5 |  |  |  |  |
Financial assets at fair value through other comprehensive income | 90,046.6 |  |  |  |  |
IFRS 9 [Member] | Notes and accounts receivable (including related parties), other receivables and refundable deposits [Member] | Amortized cost [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 131,269.7 |  |  |  |  |
Financial assets | 131,269.7 |  |  |  |  |
IFRS 9 [Member] | Derivative financial liabilities [Member] | Held for trading [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial liabilities | 26.7 |  |  |  |  |
IFRS 9 [Member] | Derivative financial liabilities [Member] | Hedging instruments [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial liabilities | 15.6 |  |  |  |  |
IFRS 9 [Member] | Short-term loans, accounts payable (including related parties), payables to contractors and equipment suppliers, accrued expenses and other current liabilities, bonds payable and guarantee deposits [Member] | Amortized cost [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial liabilities | 340,501.2 |  |  |  |  |
IAS 18 and Revenue-related Interpretations [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Inventories |  | 73,880.7 |  |  |  |
Other financial assets-current |  | 7,253.1 |  |  |  |
Investments accounted for using equity method |  | 17,731.8 |  |  |  |
Provisions - current |  | 13,961.8 |  |  |  |
Accrued expenses and other current liabilities |  | 65,588.4 |  |  |  |
Retained earnings |  | 1,205,051.3 |  |  |  |
NON-CONTROLLING INTERESTS |  | $ 699.7 |  |  |  |
IFRS 15 [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Inventories | 73,861.0 |  |  |  |  |
Other financial assets-current | 7,287.2 |  |  |  |  |
Investments accounted for using equity method | 17,751.3 |  |  |  |  |
Accrued expenses and other current liabilities | 79,550.2 |  |  |  |  |
Retained earnings | 1,205,083.3 |  |  |  |  |
NON-CONTROLLING INTERESTS | 701.6 |  |  |  |  |
IFRS 15 [member] | Adjustments arising from initial application [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Inventories | (19.7) |  |  |  |  |
Other financial assets-current | 34.1 |  |  |  |  |
Investments accounted for using equity method | 19.5 |  |  |  |  |
TOTAL | 33.9 |  |  |  |  |
Provisions - current | (13,961.8) |  |  |  |  |
Accrued expenses and other current liabilities | 13,961.8 |  |  |  |  |
Total liabilities |  |  |  |  |  |
Retained earnings | 32.0 |  |  |  |  |
NON-CONTROLLING INTERESTS | 1.9 |  |  |  |  |
Total equity | 33.9 |  |  |  |  |
IAS 39 [Member] | Equity securities [Member] | Available-for-sale [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 7,422.4 |  |  |  |  |
Financial assets | 7,422.4 |  |  |  |  |
IAS 39 [Member] | Cash and cash equivalents [Member] | Loans and receivables [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 553,391.7 |  |  |  |  |
Financial assets | 553,391.7 |  |  |  |  |
IAS 39 [Member] | Derivative financial assets [Member] | Hedging instruments [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 34.4 |  |  |  |  |
Financial assets | 34.4 |  |  |  |  |
IAS 39 [Member] | Derivative financial assets [Member] | Held for trading [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 569.8 |  |  |  |  |
Financial assets | 569.8 |  |  |  |  |
IAS 39 [Member] | Debt securities [Member] | Available-for-sale [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 90,826.1 |  |  |  |  |
Financial assets | 90,826.1 |  |  |  |  |
IAS 39 [Member] | Debt securities [Member] | Held-to-maturity [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 20,821.7 |  |  |  |  |
Financial assets | 20,821.7 |  |  |  |  |
IAS 39 [Member] | Notes and accounts receivable (including related parties), other receivables and refundable deposits [Member] | Loans and receivables [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial assets | 131,024.9 |  |  |  |  |
Financial assets | 131,024.9 |  |  |  |  |
IAS 39 [Member] | Derivative financial liabilities [Member] | Held for trading [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial liabilities | 26.7 |  |  |  |  |
IAS 39 [Member] | Derivative financial liabilities [Member] | Hedging instruments [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial liabilities | 15.6 |  |  |  |  |
IAS 39 [Member] | Short-term loans, accounts payable (including related parties), payables to contractors and equipment suppliers, accrued expenses and other current liabilities, bonds payable and guarantee deposits [Member] | Amortized cost [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Financial liabilities | $ 340,501.2 |  |  |  |  |

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