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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 |

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