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Subsidiaries - Summarized Financial Information Before Intercompany Eliminations (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of subsidiaries [Line Items]          
Current assets $ 91,021   $ 81,803   $ 3,281
Noncurrent assets 421,854   424,377   15,208
Current liabilities 66,229   73,223   2,387
Noncurrent liabilities 57,516   45,684   2,074
Equity attributable to the parent 377,383   376,115   13,604
NONCONTROLLING INTERESTS 11,747   11,158   $ 424
NET INCOME 37,047 $ 1,336 34,704 $ 33,921  
Profit attributable to the parent 35,616 1,284 33,419 32,947  
Profit attributable to noncontrolling interests 1,431 52 1,285 974  
Total other comprehensive income (loss), net of income tax (966) (35) 1,290 1,328  
Total comprehensive income attributable to the parent 34,652 1,249 34,713 34,282  
Total comprehensive income attributable to noncontrolling interests 1,429 52 1,281 967  
TOTAL COMPREHENSIVE INCOME 36,081 1,301 35,994 35,249  
Net cash flow from operating activities 74,858 2,699 74,456 72,427  
Net cash flow from investing activities (31,172) (1,125) (68,254) (27,127)  
Net cash flow from financing activities (34,314) (1,237) (9,802) (38,934)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (13) 0 (30) 39  
Net cash inflow 9,359 $ 337 (3,630) 6,405  
Senao International Co., Ltd. (SENAO) [Member]          
Disclosure of subsidiaries [Line Items]          
Current assets 7,963   6,834    
Noncurrent assets 2,981   3,194    
Current liabilities 4,561   3,854    
Noncurrent liabilities 418   416    
Equity attributable to the parent 1,628   1,569    
NONCONTROLLING INTERESTS 4,337   4,189    
Revenues and income 31,302   27,232 29,131  
Costs and expenses 30,715   26,797 28,725  
NET INCOME 587   435 406  
Profit attributable to the parent 166   123 115  
Profit attributable to noncontrolling interests 421   312 291  
Other comprehensive income (loss) attributable to the parent 2   1 (7)  
Other comprehensive income attributable to noncontrolling interests 5   2 22  
Total other comprehensive income (loss), net of income tax 7   3 15  
Total comprehensive income attributable to the parent 168   124 108  
Total comprehensive income attributable to noncontrolling interests 426   314 313  
TOTAL COMPREHENSIVE INCOME 594   438 421  
Net cash flow from operating activities 654   862 538  
Net cash flow from investing activities 215   54 235  
Net cash flow from financing activities (690)   (687) (718)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 0   0 0  
Net cash inflow 179   229 55  
Dividends paid to noncontrolling interests 278   269 269  
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member]          
Disclosure of subsidiaries [Line Items]          
Current assets 4,657   4,122    
Noncurrent assets 4,063   4,013    
Current liabilities 1,183   1,115    
Noncurrent liabilities 32   12    
Equity attributable to the parent 2,572   2,402    
NONCONTROLLING INTERESTS 4,933   4,606    
Revenues and income 4,254   4,221 3,404  
Costs and expenses 3,360   3,301 2,775  
NET INCOME 894   920 629  
Profit attributable to the parent 306   316 215  
Profit attributable to noncontrolling interests 588   604 414  
Other comprehensive income (loss) attributable to the parent (1)   0 (1)  
Other comprehensive income attributable to noncontrolling interests (2)   0 (2)  
Total other comprehensive income (loss), net of income tax (3)   0 (3)  
Total comprehensive income attributable to the parent 305   316 214  
Total comprehensive income attributable to noncontrolling interests 586   604 412  
TOTAL COMPREHENSIVE INCOME 891   920 626  
Net cash flow from operating activities 1,090   1,483 507  
Net cash flow from investing activities (519)   (533) (1,426)  
Net cash flow from financing activities (414)   (349) (349)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (1)   1 (5)  
Net cash inflow 156   602 (1,273)  
Dividends paid to noncontrolling interests $ 259   $ 216 $ 216