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Subsidiaries - Summarized Financial Information Before Intercompany Eliminations (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2020
USD ($)
Disclosure of subsidiaries [Line Items]          
Current assets $ 81,803   $ 94,072   $ 2,913
Noncurrent assets 424,377   383,056   15,113
Current liabilities 73,223   66,143   2,608
Noncurrent liabilities 45,684   26,713   1,627
Equity attributable to the parent 376,115   374,157   13,394
NONCONTROLLING INTERESTS 11,158   10,115   $ 397
NET INCOME 34,704 $ 1,236 33,921 $ 38,581  
Profit attributable to the parent 33,419 1,190 32,947 37,557  
Profit attributable to noncontrolling interests 1,285 46 974 1,024  
Other comprehensive income (loss) for the year 1,290 46 1,328 (1,014)  
Total comprehensive income attributable to the parent 34,713 1,236 34,282 36,552  
Total comprehensive income attributable to noncontrolling interests 1,281 46 967 1,015  
TOTAL COMPREHENSIVE INCOME 35,994 1,282 35,249 37,567  
Net cash flow from operating activities 74,456 2,652 72,427 66,366  
Net cash flow from investing activities (68,254) (2,431) (27,127) (32,614)  
Net cash flow from financing activities (9,802) (349) (38,934) (35,035)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (30) (1) 39 103  
Net cash inflow (3,630) $ (129) 6,405 (1,180)  
Senao International Co., Ltd. (SENAO) [Member]          
Disclosure of subsidiaries [Line Items]          
Current assets 6,834   6,751    
Noncurrent assets 3,194   3,173    
Current liabilities 3,854   3,637    
Noncurrent liabilities 416   590    
Equity attributable to the parent 1,569   1,551    
NONCONTROLLING INTERESTS 4,189   4,146    
Revenues and income 27,232   29,131 31,540  
Costs and expenses 26,797   28,725 31,081  
NET INCOME 435   406 459  
Profit attributable to the parent 123   115 133  
Profit attributable to noncontrolling interests 312   291 326  
Other comprehensive income (loss) attributable to the parent 1   (7) (2)  
Other comprehensive income (loss) attributable to noncontrolling interests 2   22 (10)  
Other comprehensive income (loss) for the year 3   15 (12)  
Total comprehensive income attributable to the parent 124   108 131  
Total comprehensive income attributable to noncontrolling interests 314   313 316  
TOTAL COMPREHENSIVE INCOME 438   421 447  
Net cash flow from operating activities 862   538 696  
Net cash flow from investing activities 54   235 (13)  
Net cash flow from financing activities (687)   (718) (491)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 0   0 1  
Net cash inflow 229   55 193  
Dividends paid to noncontrolling interests 269   269 587  
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member]          
Disclosure of subsidiaries [Line Items]          
Current assets 4,122   3,710    
Noncurrent assets 4,013   4,044    
Current liabilities 1,115   1,316    
Noncurrent liabilities 12   22    
Equity attributable to the parent 2,402   2,199    
NONCONTROLLING INTERESTS 4,606   4,217    
Revenues and income 4,221   3,404 3,299  
Costs and expenses 3,301   2,775 2,549  
NET INCOME 920   629 750  
Profit attributable to the parent 316   215 273  
Profit attributable to noncontrolling interests 604   414 477  
Other comprehensive income (loss) attributable to the parent 0   (1) 0  
Other comprehensive income (loss) attributable to noncontrolling interests 0   (2) 0  
Other comprehensive income (loss) for the year 0   (3) 0  
Total comprehensive income attributable to the parent 316   214 273  
Total comprehensive income attributable to noncontrolling interests 604   412 477  
TOTAL COMPREHENSIVE INCOME 920   626 750  
Net cash flow from operating activities 1,483   507 862  
Net cash flow from investing activities (533)   (1,426) (733)  
Net cash flow from financing activities (349)   (349) (328)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 1   (5) 1  
Net cash inflow 602   (1,273) (198)  
Dividends paid to noncontrolling interests $ 216   $ 216 $ 210