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Subsidiaries - Summarized Financial Information Before Intercompany Eliminations (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 ($)
Dec. 31, 2017
USD ($)
Disclosure of subsidiaries [Line Items]            
Current assets $ 79,334   $ 81,620     $ 2,677
Noncurrent assets 371,568   365,295     12,536
Current liabilities 63,939   64,160     2,157
Noncurrent liabilities 17,553   15,827     593
Equity attributable to the parent 360,936   360,656     12,177
NONCONTROLLING INTERESTS 8,474   6,272   $ 8,470 $ 286
NET INCOME 40,160 $ 1,355 41,626 $ 42,852    
Profit attributable to the parent 38,988 1,315 40,485 42,039    
Profit Allocated to Noncontrolling Interests 1,172 40 1,141 813    
Other comprehensive loss for the year (1,306) (44) (2,056) (833)    
Total comprehensive income attributable to the parent 37,705 1,272 38,486 41,207    
Total comprehensive income attributable to noncontrolling interests 1,149 39 1,084 812    
TOTAL COMPREHENSIVE INCOME 38,854 1,311 39,570 42,019    
Net cash flow from operating activities 70,932 2,393 64,952 76,325    
Net cash flow from investing activities (36,721) (1,239) (21,663) (30,453)    
Net cash flow from financing activities (36,608) (1,234) (42,518) (39,186)    
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 122 4 58 25    
Net cash inflow (outflow) (2,275) (76) 829 6,711    
Stockholders of the parent 38,988 1,315 40,485 42,039    
Noncontrolling interests 1,172 40 1,141 813    
Stockholders of the parent 37,705 $ 1,272 38,486 41,207    
Senao International Co., Ltd. (SENAO) [Member]            
Disclosure of subsidiaries [Line Items]            
Current assets 7,584   7,762      
Noncurrent assets 2,531   2,535      
Current liabilities 4,278   4,466      
Noncurrent liabilities 160   155      
Equity attributable to the parent 1,585   1,607      
NONCONTROLLING INTERESTS 4,092   4,069      
Revenue and income 36,038   34,453 35,944    
Costs and expenses 35,200   33,476 35,171    
NET INCOME 838   977 773    
Profit attributable to the parent 246   287 222    
Profit Allocated to Noncontrolling Interests 592   690 551    
Other comprehensive income (loss) attributable to the parent 3   (21) (1)    
Other comprehensive loss attributable to noncontrolling interests (17)   (53) (2)    
Other comprehensive loss for the year (14)   (74) (3)    
Total comprehensive income attributable to the parent 249   266 222    
Total comprehensive income attributable to noncontrolling interests 575   637 548    
TOTAL COMPREHENSIVE INCOME 824   903 770    
Dividends paid to noncontrolling interests 703   526 274    
Net cash flow from operating activities 1,081   531 1,739    
Net cash flow from investing activities (57)   130 54    
Net cash flow from financing activities (897)   (677) (1,530)    
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (2)   (7) 11    
Net cash inflow (outflow) 125   (23) 274    
Stockholders of the parent 246   287 222    
Noncontrolling interests 592   690 551    
Stockholders of the parent 249   266 222    
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member]            
Disclosure of subsidiaries [Line Items]            
Current assets 4,496   2,116      
Noncurrent assets 2,167   1,872      
Current liabilities 965   1,323      
Noncurrent liabilities 1   1      
Equity attributable to the parent 2,184   1,089      
NONCONTROLLING INTERESTS 3,513   1,575      
Revenue and income 3,127   2,607 1,735    
Costs and expenses 2,402   2,020 1,341    
NET INCOME 725   587 394    
Profit attributable to the parent 294   246 182    
Profit Allocated to Noncontrolling Interests 431   341 212    
Other comprehensive income (loss) attributable to the parent (1)   0 0    
Other comprehensive loss attributable to noncontrolling interests (2)   0 0    
Other comprehensive loss for the year (3)   0 0    
Total comprehensive income attributable to the parent 293   246 182    
Total comprehensive income attributable to noncontrolling interests 429   341 212    
TOTAL COMPREHENSIVE INCOME 722   587 394    
Dividends paid to noncontrolling interests 146   109 35    
Net cash flow from operating activities 1,052   671 532    
Net cash flow from investing activities (639)   (904) (200)    
Net cash flow from financing activities 2,306   841 (112)    
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (4)   (2) 3    
Net cash inflow (outflow) 2,715   606 223    
Stockholders of the parent 294   246 182    
Noncontrolling interests 431   341 212    
Stockholders of the parent $ 293   $ 246 $ 182