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Reconciliation Of Liabilities Arising From Financing Activities - Schedule of Liabilities Arising From Financing Activities (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Balance as of January 1, 2017 $ 275,822.4
Financing Cash Flow (30,578.0)
Non-cash changes Foreign Exchange Movement (9,113.6)
Non-cash changes Other Changes (6,082.3)
Balance as of December 31, 2017 230,048.5
Short-term loans [member]  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Balance as of January 1, 2017 57,958.2
Financing Cash Flow 10,394.3
Non-cash changes Foreign Exchange Movement (4,585.7)
Balance as of December 31, 2017 63,766.8
Bonds payable [member]  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Balance as of January 1, 2017 191,193.6
Financing Cash Flow (38,100.0)
Non-cash changes Foreign Exchange Movement (2,918.9)
Non-cash changes Other Changes 26.4
Balance as of December 31, 2017 150,201.1
Guarantee deposits [member]  
Disclosure of reconciliation of liabilities arising from financing activities [line items]  
Balance as of January 1, 2017 26,670.6
Financing Cash Flow (2,872.3)
Non-cash changes Foreign Exchange Movement (1,609.0)
Non-cash changes Other Changes (6,108.7)
Balance as of December 31, 2017 $ 16,080.6