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Financial Instruments - Summary of Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments, Including Principal and Interest (Detail)
$ in Millions, $ in Millions
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of detailed information about financial instruments [line items]      
Short-term loans $ 63,766.8 $ 2,151.4 $ 57,958.2
Accrued expenses and other current liabilities 65,588.4 $ 2,212.8 36,581.6
Total non-derivative and derivative financial instruments 344,307.8   393,997.6
Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Short-term loans 63,802.0   57,974.6
Accounts payable (including related parties) 30,069.2   27,324.5
Payables to contractors and equipment suppliers 55,723.8   63,154.5
Accrued expenses and other current liabilities 24,659.7   20,713.3
Bonds payable 154,536.9   198,151.1
Long-term bank loans     33.1
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 16,080.6   26,670.6
Non-derivative financial liabilities 344,872.2   394,021.7
Derivative financial instruments [member] | Forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows 67,393.5   40,571.8
Inflows (67,957.9)   (40,586.3)
Derivative financial instruments (564.4)   (14.5)
Derivative financial instruments [member] | Cross currency swap contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows     5,478.0
Inflows     (5,487.6)
Derivative financial instruments     (9.6)
Less than 1 year [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 242,360.9   221,823.0
Less than 1 year [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Short-term loans 63,802.0   57,974.6
Accounts payable (including related parties) 30,069.2   27,324.5
Payables to contractors and equipment suppliers 55,723.8   63,154.5
Accrued expenses and other current liabilities 24,659.7   20,713.3
Bonds payable 60,176.8   40,669.5
Long-term bank loans     10.5
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 8,493.8   12,000.2
Non-derivative financial liabilities 242,925.3   221,847.1
Less than 1 year [member] | Derivative financial instruments [member] | Forward exchange contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows 67,393.5   40,571.8
Inflows (67,957.9)   (40,586.3)
Derivative financial instruments (564.4)   (14.5)
Less than 1 year [member] | Derivative financial instruments [member] | Cross currency swap contracts [member]      
Disclosure of detailed information about financial instruments [line items]      
Outflows     5,478.0
Inflows     (5,487.6)
Derivative financial instruments     (9.6)
2-3 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 75,881.9   112,242.1
2-3 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 68,378.8   99,161.5
Long-term bank loans     20.1
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 7,503.1   13,060.5
Non-derivative financial liabilities 75,881.9   112,242.1
4-5 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 7,861.4   36,953.1
4-5 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 7,777.7   35,340.7
Long-term bank loans     2.5
Guarantee deposits (including those classified under accrued expenses and other current liabilities) 83.7   1,609.9
Non-derivative financial liabilities 7,861.4   36,953.1
Later than 5 years [member]      
Disclosure of detailed information about financial instruments [line items]      
Total non-derivative and derivative financial instruments 18,203.6   22,979.4
Later than 5 years [member] | Non-derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Bonds payable 18,203.6   22,979.4
Non-derivative financial liabilities $ 18,203.6   $ 22,979.4