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Subsidiaries - Business Combinations (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Jan. 01, 2018
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2014
TWD ($)
CURRENT ASSETS                
Cash and cash equivalents $ 28,825   $ 31,100 $ 30,271   $ 973 $ 1,049 $ 23,560
Inventories 8,840   7,423     298    
Prepayments 2,188   2,978     74    
Other current assets 2,183   2,122     74    
NONCURRENT ASSETS                
Property, plant and equipment 288,708   291,170     9,740    
Refundable deposits 1,860   2,083          
Deferred income tax assets 2,730   2,322     92    
Other noncurrent assets 5,536   5,025     187    
CURRENT LIABILITIES                
Short-term loans (70)   (138)     (2)    
Trade notes payable (19,396)   (18,810)     (654)    
Accounts and other payables (25,001)   (26,418)     (844)    
Other current liabilities (1,081)   (1,330)     (37)    
NONCURRENT LIABILITIES                
Long-term loans (1,600)   (1,600)     (54)    
Deferred income tax liabilities (1,430)   (1,464)     (48)    
Other noncurrent liabilities (3,458)   (3,004)     (117)    
Add: Noncontrolling interest (30% of the recognized amounts of Youth and its subsidiaries’ identifiable net assets) 8,474   6,272   $ 8,470 286    
Less: Cash and cash equivalents acquired (28,825)   (31,100) (30,271)   $ (973) $ (1,049) $ (23,560)
Net cash outflow on acquisition of subsidiaries $ 0 $ 0 $ 0 $ 114        
Youth Co., Ltd. (Youth) [Member]                
Disclosure of detailed information about business combination [Line Items]                
Principal Activity       Sale and maintenance of information and communication technologies products        
Date of Acquisition       Sep. 02, 2015        
Proportion of Voting Equity Interests Acquired       70.00%        
Consideration Transferred       $ 135        
CURRENT ASSETS                
Cash and cash equivalents       21        
Accounts and other receivables       10        
Inventories       30        
Prepayments       6        
Other current assets       6        
NONCURRENT ASSETS                
Property, plant and equipment       36        
Intangible assets       259        
Refundable deposits       22        
Deferred income tax assets       4        
Other noncurrent assets       32        
CURRENT LIABILITIES                
Short-term loans       (54)        
Trade notes payable       (9)        
Accounts and other payables       (75)        
Other current liabilities       (80)        
NONCURRENT LIABILITIES                
Long-term loans       (40)        
Deferred income tax liabilities       (44)        
Other noncurrent liabilities       (10)        
Assets acquired and liabilities assumed       114        
Add: Noncontrolling interest (30% of the recognized amounts of Youth and its subsidiaries’ identifiable net assets)       34        
Less: Fair value of identifiable net assets acquired       (114)        
Goodwill arising on acquisition       55        
Less: Cash and cash equivalents acquired       (21)        
Net cash outflow on acquisition of subsidiaries       114        
Revenue       188        
Net loss       $ 18