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Application of New and Amended International Financial Reporting Standards - Schedule of Anticipated Significant Impact on Assets, Liabilities and Equity of Retrospective Application of IFRS 9 (Detail)
$ in Millions, $ in Millions
Jan. 01, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Impact on assets, liabilities and equity        
Financial assets at fair value through profit or loss - noncurrent $ 54 $ 0    
Financial assets at fair value through other comprehensive income - noncurrent 7,539 0    
Available-for-sale financial assets - noncurrent 0 5,751 $ 194 $ 4,764
Total effect on liabilities (deferred income tax liabilities) 1,429 1,430    
Unrealized gain or loss on available-for-sale financial assets 0 558    
Unrealized gain or loss on financial assets at fair value through other comprehensive income 883 0    
Unappropriated earnings 56,155 54,633 1,843 55,657
Noncontrolling interests 8,470 $ 8,474 $ 286 $ 6,272
Increase decrease due to application of IFRS 9 [Member]        
Impact on assets, liabilities and equity        
Financial assets at fair value through profit or loss - noncurrent 54      
Financial assets at fair value through other comprehensive income - noncurrent 7,539      
Available-for-sale financial assets - noncurrent (5,751)      
Total effect on assets 1,842      
Total effect on liabilities (deferred income tax liabilities) (1)      
Unrealized gain or loss on available-for-sale financial assets (558)      
Unrealized gain or loss on financial assets at fair value through other comprehensive income 883      
Unappropriated earnings 1,522      
Noncontrolling interests (4)      
Total effect on equity $ 1,843