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Subsidiaries - Summarized Financial Information Before Intercompany Eliminations (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of subsidiaries [Line Items]          
Current assets $ 112,968   $ 103,204   $ 3,445
Noncurrent assets 421,329   420,537   12,850
Current liabilities 81,997   67,750   2,501
Noncurrent liabilities 56,494   63,272   1,723
Equity attributable to the parent 382,826   380,287   11,675
NONCONTROLLING INTERESTS 12,980   12,432   $ 396
NET INCOME 38,508 $ 1,174 38,061 $ 37,869  
Profit attributable to the parent 37,189 1,134 36,958 36,358  
Profit attributable to noncontrolling interests 1,319 40 1,103 1,511  
Other comprehensive income (loss) 2,081 64 669 1,112  
Total comprehensive income attributable to the parent 39,223 1,196 37,658 37,450  
Total comprehensive income, attributable to non-controlling interests 1,366 42 1,072 1,531  
TOTAL COMPREHENSIVE INCOME 40,589 1,238 38,730 38,981  
Net cash flow from operating activities 79,244 2,417 74,559 75,951  
Net cash flow from investing activities (35,332) (1,078) (50,174) (30,789)  
Net cash flow from financing activities (41,516) (1,266) (40,730) (34,800)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 40 1 (24) 52  
Net cash inflow (outflow) 2,436 $ 74 (16,369) 10,414  
Senao International Co., Ltd. (SENAO) [Member]          
Disclosure of subsidiaries [Line Items]          
Current assets 6,738   6,540    
Noncurrent assets 3,522   3,141    
Current liabilities 3,582   2,982    
Noncurrent liabilities 416   459    
Equity attributable to the parent 1,713   1,707    
NONCONTROLLING INTERESTS 4,549   4,533    
Revenues and income 32,503   31,675 31,602  
Costs and expenses 32,012   30,964 30,958  
NET INCOME 491   711 644  
Profit attributable to the parent 138   201 182  
Profit attributable to noncontrolling interests 353   510 462  
Other comprehensive income (loss) attributable to the parent 11   (9) 11  
Other comprehensive income (loss) attributable to noncontrolling interests 30   (23) 26  
Other comprehensive income (loss) 41   (32) 37  
Total comprehensive income attributable to the parent 149   192 192  
Total comprehensive income, attributable to non-controlling interests 383   487 488  
TOTAL COMPREHENSIVE INCOME 532   679 680  
Net cash flow from operating activities 904   1,146 (329)  
Net cash flow from investing activities (356)   36 36  
Net cash flow from financing activities (819)   (873) (826)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 0   0 1  
Net cash inflow (outflow) (271)   309 (1,118)  
Dividends paid to noncontrolling interests 371   408 371  
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member]          
Disclosure of subsidiaries [Line Items]          
Current assets 4,936   3,773    
Noncurrent assets 4,222   4,499    
Current liabilities 1,102   677    
Noncurrent liabilities 21   23    
Equity attributable to the parent 2,746   2,578    
NONCONTROLLING INTERESTS 5,289   4,994    
Revenues and income 3,670   2,941 4,434  
Costs and expenses 3,207   2,905 3,673  
NET INCOME 463   36 761  
Profit attributable to the parent 168   21 265  
Profit attributable to noncontrolling interests 295   15 496  
Other comprehensive income (loss) attributable to the parent 6   (1) 5  
Other comprehensive income (loss) attributable to noncontrolling interests 10   (2) 7  
Other comprehensive income (loss) 16   (3) 12  
Total comprehensive income attributable to the parent 174   20 270  
Total comprehensive income, attributable to non-controlling interests 305   13 503  
TOTAL COMPREHENSIVE INCOME 479   33 773  
Net cash flow from operating activities 616   325 1,401  
Net cash flow from investing activities (188)   (244) (1,011)  
Net cash flow from financing activities (43)   (409) (388)  
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 15   (2) 8  
Net cash inflow (outflow) 400   (330) 10  
Dividends paid to noncontrolling interests $ 11   $ 253 $ 293