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Cash Flow Information - Schedule of Liabilities Arising From Financing Activities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance as of January 1, 2017 $ 230,048.5 $ 275,822.4
Financing Cash Flow (34,381.1) (30,578.0)
Non-cash changes Foreign Exchange Movement 1,105.5 (9,113.6)
Non-cash changes Other Changes (6,029.2) (6,082.3)
Balance as of December 31, 2017 190,743.7 230,048.5
Short-term loans [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance as of January 1, 2017 63,766.8 57,958.2
Financing Cash Flow 23,923.0 10,394.3
Non-cash changes Foreign Exchange Movement 1,064.9 (4,585.7)
Balance as of December 31, 2017 88,754.7 63,766.8
Bonds payable [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance as of January 1, 2017 16,080.6 26,670.6
Financing Cash Flow (279.2) (2,872.3)
Non-cash changes Foreign Exchange Movement 423.5 (1,609.0)
Non-cash changes Other Changes (6,035.9) (6,108.7)
Balance as of December 31, 2017 10,189.0 16,080.6
Guarantee deposits [member]    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Balance as of January 1, 2017 150,201.1 191,193.6
Financing Cash Flow (58,024.9) (38,100.0)
Non-cash changes Foreign Exchange Movement (382.9) (2,918.9)
Non-cash changes Other Changes 6.7 26.4
Balance as of December 31, 2017 $ 91,800.0 $ 150,201.1