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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 |

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