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Subsidiaries - Summarized Financial Information Before Intercompany Eliminations (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
TWD ($)
Disclosure of subsidiaries [Line Items]            
Current assets $ 94,072   $ 91,689   $ 3,145  
Noncurrent assets 383,056   375,367   12,807  
Current liabilities 66,143   63,218   2,211  
Noncurrent liabilities 26,713   19,309   893  
Equity attributable to the parent 374,157   374,672   12,510  
NONCONTROLLING INTERESTS 10,115   9,857   $ 338 $ 9,837
NET INCOME 33,921 $ 1,134 38,581 $ 40,160    
Profit attributable to the parent 32,947 1,102 37,557 38,988    
Profit attributable to noncontrolling interests 974 32 1,024 1,172    
Other comprehensive income (loss) for the year 1,328 44 (1,014) (1,306)    
Total comprehensive income attributable to the parent 34,282 1,146 36,552 37,705    
Total comprehensive income attributable to noncontrolling interests 967 32 1,015 1,149    
TOTAL COMPREHENSIVE INCOME 35,249 1,178 37,567 38,854    
Net cash flow from operating activities 72,427 2,421 66,366 70,932    
Net cash flow from investing activities (27,127) (907) (32,614) (36,721)    
Net cash flow from financing activities (38,934) (1,302) (35,035) (36,608)    
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 39 2 103 122    
Net cash inflow 6,405 $ 214 (1,180) (2,275)    
Senao International Co., Ltd. (SENAO) [Member]            
Disclosure of subsidiaries [Line Items]            
Current assets 6,751   7,041      
Noncurrent assets 3,173   2,527      
Current liabilities 3,637   3,757      
Noncurrent liabilities 590   164      
Equity attributable to the parent 1,551   1,539      
NONCONTROLLING INTERESTS 4,146   4,108      
Revenue and income 29,131   31,540 36,038    
Costs and expenses 28,725   31,081 35,200    
NET INCOME 406   459 838    
Profit attributable to the parent 115   133 246    
Profit attributable to noncontrolling interests 291   326 592    
Other comprehensive income (loss) attributable to the parent (7)   (2) 3    
Other comprehensive income (loss) attributable to noncontrolling interests 22   (10) (17)    
Other comprehensive income (loss) for the year 15   (12) (14)    
Total comprehensive income attributable to the parent 108   131 249    
Total comprehensive income attributable to noncontrolling interests 313   316 575    
TOTAL COMPREHENSIVE INCOME 421   447 824    
Net cash flow from operating activities 538   696 1,081    
Net cash flow from investing activities 235   (13) (57)    
Net cash flow from financing activities (718)   (491) (897)    
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 0   1 (2)    
Net cash inflow 55   193 125    
Dividends paid to noncontrolling interests 269   587 703    
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member]            
Disclosure of subsidiaries [Line Items]            
Current assets 3,710   4,417      
Noncurrent assets 4,044   2,779      
Current liabilities 1,316   1,076      
Noncurrent liabilities 22   1      
Equity attributable to the parent 2,199   2,097      
NONCONTROLLING INTERESTS 4,217   4,022      
Revenue and income 3,404   3,299 3,127    
Costs and expenses 2,775   2,549 2,402    
NET INCOME 629   750 725    
Profit attributable to the parent 215   273 294    
Profit attributable to noncontrolling interests 414   477 431    
Other comprehensive income (loss) attributable to the parent (1)   0 (1)    
Other comprehensive income (loss) attributable to noncontrolling interests (2)   0 (2)    
Other comprehensive income (loss) for the year (3)   0 (3)    
Total comprehensive income attributable to the parent 214   273 293    
Total comprehensive income attributable to noncontrolling interests 412   477 429    
TOTAL COMPREHENSIVE INCOME 626   750 722    
Net cash flow from operating activities 507   862 1,052    
Net cash flow from investing activities (1,426)   (733) (639)    
Net cash flow from financing activities (349)   (328) 2,306    
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (5)   1 (4)    
Net cash inflow (1,273)   (198) 2,715    
Dividends paid to noncontrolling interests $ 216   $ 210 $ 146