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Equity - Changes in Other Reserves (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Balance, beginning of year $ (26,917.9)   $ 1,663.9 $ 11,774.1
Exchange differences arising on translation of foreign operations 14,562.0   (28,257.4) (9,409.2)
Equity instruments (3,311.6)      
Other comprehensive income reclassified to profit or loss upon disposal of subsidiaries       36.1
Changes in fair value of available-for-sale financial assets     (154.7) (696.3)
Debt instruments (1,858.0)      
Cumulative (gain)/loss reclassified to profit or loss upon disposal of available-for-sale financial assets     (61.2) 4.1
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal 1,193.1      
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal 989.1      
Loss allowance adjustments from debt instruments (2.0)      
Gain (loss) arising on changes in the fair value of hedging instruments 41.0   99.6  
Transferred to initial carrying amount of hedged items (22.2)   (94.9)  
Share of other comprehensive income (loss) of associates 86.5   (99.4) 24.5
Share of unearned stock-based compensation of associates 8.5   (10.3)  
Other comprehensive loss reclassified to profit or loss upon disposal of associates       (8.2)
Income tax effect 92.4   (3.5) (61.2)
Balance, end of year (15,449.9) $ (504.7) (26,917.9) 1,663.9
ADJUSTED BALANCE        
Balance, beginning of year (27,228.7)      
Balance, end of year     (27,228.7)  
Others - Foreign Currency Translation Reserve [member]        
Balance, beginning of year (26,697.7)   1,661.2 11,039.9
Exchange differences arising on translation of foreign operations 14,562.0   (28,257.4) (9,409.2)
Other comprehensive income reclassified to profit or loss upon disposal of subsidiaries       36.1
Share of other comprehensive income (loss) of associates 93.3   (101.5) (0.9)
Other comprehensive loss reclassified to profit or loss upon disposal of associates       (4.7)
Balance, end of year (12,042.4)   (26,697.7) 1,661.2
Others - Foreign Currency Translation Reserve [member] | ADJUSTED BALANCE        
Balance, beginning of year (26,697.7)      
Balance, end of year     (26,697.7)  
Others - Unrealized Gain/Loss from Available-for-sale Financial Assets [member]        
Balance, beginning of year (214.1)   2.6 734.8
Changes in fair value of available-for-sale financial assets     (154.7) (696.3)
Cumulative (gain)/loss reclassified to profit or loss upon disposal of available-for-sale financial assets     (61.2) 4.1
Share of other comprehensive income (loss) of associates     2.1 24.7
Other comprehensive loss reclassified to profit or loss upon disposal of associates       (3.5)
Income tax effect     (2.9) (61.2)
Balance, end of year     (214.1) 2.6
Others - Cash Flow Hedges Reserve [member]        
Balance, beginning of year 4.2   0.1 (0.6)
Gain (loss) arising on changes in the fair value of hedging instruments     99.6  
Transferred to initial carrying amount of hedged items     (94.9)  
Share of other comprehensive income (loss) of associates       0.7
Income tax effect     (0.6)  
Balance, end of year     4.2 $ 0.1
Others - Stock-Based Employee Compensation [member]        
Balance, beginning of year (10.3)      
Share of unearned stock-based compensation of associates 8.5   (10.3)  
Balance, end of year (1.8)   (10.3)  
Others - Stock-Based Employee Compensation [member] | ADJUSTED BALANCE        
Balance, beginning of year (10.3)      
Balance, end of year     (10.3)  
Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member]        
Equity instruments (3,311.6)      
Debt instruments (1,858.0)      
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal 1,193.1      
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal 989.1      
Loss allowance adjustments from debt instruments (2.0)      
Share of other comprehensive income (loss) of associates (6.8)      
Income tax effect 91.8      
Balance, end of year (3,429.3)      
Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member] | ADJUSTED BALANCE        
Balance, beginning of year (524.9)      
Balance, end of year     (524.9)  
Other - Gain (loss) on hedging instruments [member]        
Gain (loss) arising on changes in the fair value of hedging instruments 41.0      
Transferred to initial carrying amount of hedged items (22.2)      
Income tax effect 0.6      
Balance, end of year 23.6      
Other - Gain (loss) on hedging instruments [member] | ADJUSTED BALANCE        
Balance, beginning of year $ 4.2      
Balance, end of year     $ 4.2