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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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The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity.

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