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Income Tax - Movements of Deferred Income Tax Assets and Liabilities (Detail) - TWD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income tax [Line Items]      
Recognized in Profit or Loss $ 101 $ (1,404) $ 222
Recognized in Other Comprehensive Income 347 349 37
Deferred tax asset [Member]      
Income tax [Line Items]      
Beginning balance 2,322 2,061 1,826
Recognized in Profit or Loss 64 (86) 192
Recognized in Other Comprehensive Income 344 347 39
From Business Combination     4
Ending balance 2,730 2,322 2,061
Deferred tax asset [Member] | Present value of funded defined benefit obligation [Member]      
Income tax [Line Items]      
Beginning balance 1,374 1,206 1,096
Recognized in Profit or Loss 5 (179) 71
Recognized in Other Comprehensive Income 344 347 39
Ending balance 1,723 1,374 1,206
Deferred tax asset [Member] | Share of profits of associates and joint ventures accounted for using equity method [Member]      
Income tax [Line Items]      
Beginning balance 330 325 277
Recognized in Profit or Loss 1 5 48
Ending balance 331 330 325
Deferred tax asset [Member] | Allowance for doubtful accounts [Member]      
Income tax [Line Items]      
Beginning balance 230 169 114
Recognized in Profit or Loss 59 61 55
Ending balance 289 230 169
Deferred tax asset [Member] | Impairment loss on property, plant and equipment [Member]      
Income tax [Line Items]      
Beginning balance 122 44 32
Recognized in Profit or Loss (10) 78 12
Ending balance 112 122 44
Deferred tax asset [Member] | Deferred revenue [Member]      
Income tax [Line Items]      
Beginning balance 117 136 156
Recognized in Profit or Loss (11) (19) (20)
Ending balance 106 117 136
Deferred tax asset [Member] | Valuation loss on inventory [Member]      
Income tax [Line Items]      
Beginning balance 20 33 41
Recognized in Profit or Loss 3 (13) (8)
Ending balance 23 20 33
Deferred tax asset [Member] | Accrued award credits liabilities [Member]      
Income tax [Line Items]      
Beginning balance 20 22 28
Recognized in Profit or Loss (5) (2) (6)
Ending balance 15 20 22
Deferred tax asset [Member] | Warranties [Member]      
Income tax [Line Items]      
Beginning balance 19 18 19
Recognized in Profit or Loss 3 1 (1)
Ending balance 22 19 18
Deferred tax asset [Member] | Property, plant and equipment [member]      
Income tax [Line Items]      
Beginning balance 2 2 0
From Business Combination     2
Ending balance 2 2 2
Deferred tax asset [Member] | Unrealised foreign exchange gains (losses) [Member]      
Income tax [Line Items]      
Beginning balance 0 18 0
Recognized in Profit or Loss 17 (18) 18
Ending balance 17 0 18
Deferred tax asset [Member] | Others [Member]      
Income tax [Line Items]      
Beginning balance 34 40 34
Recognized in Profit or Loss (5) (6) 6
Ending balance 29 34 40
Deferred tax asset [Member] | Temporary differences [Member]      
Income tax [Line Items]      
Beginning balance 2,268 2,013 1,797
Recognized in Profit or Loss 72 (92) 175
Recognized in Other Comprehensive Income 344 347 39
From Business Combination     2
Ending balance 2,684 2,268 2,013
Deferred tax asset [Member] | Unused tax losses [Member]      
Income tax [Line Items]      
Beginning balance 54 48 29
Recognized in Profit or Loss (8) 6 17
From Business Combination     2
Ending balance 46 54 48
Deferred tax asset [Member] | Trade-in right [Member]      
Income tax [Line Items]      
Beginning balance 0    
Recognized in Profit or Loss 15    
Ending balance 15 0  
Deferred tax liability [Member]      
Income tax [Line Items]      
Beginning balance (1,464) (148) (132)
Recognized in Profit or Loss 31 (1,318) 30
Recognized in Other Comprehensive Income 3 2 (2)
From Business Combination     (44)
Ending balance (1,430) (1,464) (148)
Deferred tax liability [Member] | Present value of funded defined benefit obligation [Member]      
Income tax [Line Items]      
Beginning balance (1,269) (1) 0
Recognized in Profit or Loss 4 (1,268) (1)
Ending balance (1,265) (1,269) (1)
Deferred tax liability [Member] | Unrealised foreign exchange gains (losses) [Member]      
Income tax [Line Items]      
Beginning balance (10) (1) (29)
Recognized in Profit or Loss 10 (9) 28
Ending balance 0 (10) (1)
Deferred tax liability [Member] | Others [Member]      
Income tax [Line Items]      
Beginning balance (1) (1) 0
Recognized in Profit or Loss 0 0 (1)
Ending balance (1) (1) (1)
Deferred tax liability [Member] | Land value incremental tax [Member]      
Income tax [Line Items]      
Beginning balance (95) (95) (95)
Ending balance (95) (95) (95)
Deferred tax liability [Member] | Deferred revenue for award credits [Member]      
Income tax [Line Items]      
Beginning balance (46) (2) (5)
Recognized in Profit or Loss 17 (44) 3
Ending balance (29) (46) (2)
Deferred tax liability [Member] | Intangible assets and goodwill [member]      
Income tax [Line Items]      
Beginning balance (40) (43) 0
Recognized in Profit or Loss 1 3 1
From Business Combination     (44)
Ending balance (39) (40) (43)
Deferred tax liability [Member] | Valuation gain or loss on financial instruments, net [Member]      
Income tax [Line Items]      
Beginning balance (3) (5) (3)
Recognized in Profit or Loss (1) 0 0
Recognized in Other Comprehensive Income 3 2 (2)
Ending balance $ (1) $ (3) $ (5)