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Subsidiaries - Summarized Financial Information Before Intercompany Eliminations (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2023
USD ($)
Disclosure of subsidiaries [Line Items]          
Current assets $ 103,204   $ 101,901   $ 3,371
Noncurrent assets 420,537   421,095   13,734
Current liabilities 67,750   67,740   2,213
Noncurrent liabilities 63,272   63,727   2,066
Equity attributable to the parent 380,287   379,121   12,420
NONCONTROLLING INTERESTS 12,432   12,408   $ 406
NET INCOME 38,061 $ 1,243 37,869 $ 37,047  
Profit attributable to the parent 36,958 1,207 36,358 35,616  
Profit attributable to noncontrolling interests 1,103 36 1,511 1,431  
Other comprehensive income (loss) 669 22 1,112 (966)  
Total comprehensive income attributable to the parent 37,658 1,230 37,450 34,652  
Total comprehensive income, attributable to non-controlling interests 1,072 35 1,531 1,429  
TOTAL COMPREHENSIVE INCOME 38,730 1,265 38,981 36,081  
Net cash flow from operating activities 74,559 2,436 75,951 74,858  
Net cash flow from investing activities (50,174) (1,639) (30,789) (31,172)  
Net cash flow from financing activities (40,730) (1,330) (34,800) (34,314)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (24) (1) 52 (13)  
Net cash inflow (outflow) (16,369) $ (534) 10,414 9,359  
Senao International Co., Ltd. (SENAO) [Member]          
Disclosure of subsidiaries [Line Items]          
Current assets 6,540   7,249    
Noncurrent assets 3,141   3,053    
Current liabilities 2,982   3,714    
Noncurrent liabilities 459   460    
Equity attributable to the parent 1,707   1,674    
NONCONTROLLING INTERESTS 4,533   4,454    
Revenues and income 31,675   31,602 31,302  
Costs and expenses 30,964   30,958 30,715  
NET INCOME 711   644 587  
Profit attributable to the parent 201   182 166  
Profit attributable to noncontrolling interests 510   462 421  
Other comprehensive income (loss) attributable to the parent (9)   11 2  
Other comprehensive income (loss) attributable to noncontrolling interests (23)   26 5  
Other comprehensive income (loss) (32)   37 7  
Total comprehensive income attributable to the parent 192   192 168  
Total comprehensive income, attributable to non-controlling interests 487   488 426  
TOTAL COMPREHENSIVE INCOME 679   680 594  
Net cash flow from operating activities 1,146   (329) 654  
Net cash flow from investing activities 36   36 215  
Net cash flow from financing activities (873)   (826) (690)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 0   1 0  
Net cash inflow (outflow) 309   (1,118) 179  
Dividends paid to noncontrolling interests 408   371 278  
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member]          
Disclosure of subsidiaries [Line Items]          
Current assets 3,773   4,406    
Noncurrent assets 4,499   4,631    
Current liabilities 677   1,087    
Noncurrent liabilities 23   26    
Equity attributable to the parent 2,578   2,689    
NONCONTROLLING INTERESTS 4,994   5,235    
Revenues and income 2,941   4,434 4,254  
Costs and expenses 2,905   3,673 3,360  
NET INCOME 36   761 894  
Profit attributable to the parent 21   265 306  
Profit attributable to noncontrolling interests 15   496 588  
Other comprehensive income (loss) attributable to the parent (1)   5 (1)  
Other comprehensive income (loss) attributable to noncontrolling interests (2)   7 (2)  
Other comprehensive income (loss) (3)   12 (3)  
Total comprehensive income attributable to the parent 20   270 305  
Total comprehensive income, attributable to non-controlling interests 13   503 586  
TOTAL COMPREHENSIVE INCOME 33   773 891  
Net cash flow from operating activities 325   1,401 1,090  
Net cash flow from investing activities (244)   (1,011) (519)  
Net cash flow from financing activities (409)   (388) (414)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS (2)   8 (1)  
Net cash inflow (outflow) 330   10 156  
Dividends paid to noncontrolling interests $ 253   $ 293 $ 259