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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 (Parenthetical) (Detail)
$ in Millions, $ in Millions
Jan. 01, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of initial application of standards or interpretations [line items]        
Investments accounted for using equity method   $ 17,731.8 $ 598.2 $ 19,585.3
IFRS 9 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Financial assets at fair value through other comprehensive income $ 98,436.1      
Other Equity Effect (285.1)      
Retained Earnings Effect 1,490.3      
Financial assets at fair value through profit or loss 1,349.3      
Investments accounted for using equity method 17,740.1      
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] | Retrospective adoption of IFRS 9 by associates accounted for using equity method [member]        
Disclosure of initial application of standards or interpretations [line items]        
Retained Earnings Effect 34.0      
Amortized cost [Member] | IFRS 9 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Retained Earnings Effect 236.5      
Amortized cost [Member] | Add: From loans and receivables [Member] | IFRS 9 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Loss of allowance effect (244.8)      
Retained Earnings Effect 244.8      
FVTOCI [Member] | IFRS 9 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Other Equity Effect (295.2)      
Retained Earnings Effect 1,263.9      
FVTOCI [Member] | IFRS 9 [Member] | Retrospective adoption of IFRS 9 by associates accounted for using equity method [member]        
Disclosure of initial application of standards or interpretations [line items]        
Other Equity Effect (23.6)      
Available-for-sale [Member] | IFRS 9 [Member] | Retrospective adoption of IFRS 9 by associates accounted for using equity method [member]        
Disclosure of initial application of standards or interpretations [line items]        
Other Equity Effect (2.1)      
Held-to-maturity [Member] | Debt investments previously classified as held-to-maturity financial assets and measured at amortized cost under IAS 39 [member] | IFRS 9 [Member] | Increase (decrease) due to changes in accounting policy and corrections of prior period errors [member]        
Disclosure of initial application of standards or interpretations [line items]        
Loss of allowance effect 8.3      
Retained Earnings Effect (8.3)      
FVTPL [Member] | IFRS 9 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Other Equity Effect 10.1      
Retained Earnings Effect (10.1)      
Equity securities [Member] | Add: From available for sale [Member] | IFRS 9 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Financial assets at fair value through other comprehensive income 8,389.5      
Equity securities [Member] | FVTOCI [Member] | Equity investments previously classified as available-for-sale financial assets under IAS 39 [member] | IFRS 9 [Member] | Increase (decrease) due to changes in accounting policy and corrections of prior period errors [member]        
Disclosure of initial application of standards or interpretations [line items]        
Other Equity Effect (1,294.6)      
Retained Earnings Effect 1,294.6      
Equity securities [Member] | FVTOCI [Member] | equity investments previously measured at cost under IAS 39 are remeasured at fair value under IFRS [member] | IFRS 9 [Member] | Increase (decrease) due to changes in accounting policy and corrections of prior period errors [member]        
Disclosure of initial application of standards or interpretations [line items]        
Financial assets at fair value through other comprehensive income 967.1      
Other Equity Effect 968.7      
Non-controlling interests effect (1.6)      
Equity securities [Member] | FVTOCI [Member] | Add: From available for sale [Member] | IFRS 9 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Other Equity Effect (325.9)      
Retained Earnings Effect 1,294.6      
Debt securities [Member] | FVTOCI [Member] | Debt investments were previously classified as available-for-sale financial assets under IAS 39 [member] | IFRS 9 [Member] | Increase (decrease) due to changes in accounting policy and corrections of prior period errors [member]        
Disclosure of initial application of standards or interpretations [line items]        
Other Equity Effect 30.7      
Retained Earnings Effect (30.7)      
Debt securities [Member] | FVTOCI [Member] | Debt investments were previously classified as available-for-sale financial assets under IAS 39 [member] | IFRS 9 [Member] | Reclassification Adjustment [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Other Equity Effect (434.4)      
Debt securities [Member] | Available-for-sale [Member] | Debt investments were previously classified as available-for-sale financial assets under IAS 39 [member] | IFRS 9 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Financial assets at fair value through profit or loss 779.5      
Debt securities [Member] | FVTPL [Member] | Debt investments were previously classified as available-for-sale financial assets under IAS 39 [member] | IFRS 9 [Member] | Increase (decrease) due to changes in accounting policy [member]        
Disclosure of initial application of standards or interpretations [line items]        
Retained Earnings Effect (10.1)      
Other equity-Unrealized gain/loss on financial assets at FVTOCI [Member] | Equity securities [Member] | FVTOCI [Member] | Add: From available for sale [Member] | IFRS 9 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Other Equity Effect $ 228.3