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Subsidiaries - Summarized Financial Information Before Intercompany Eliminations (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 TWD ($)
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Current assets | $ 94,072 |  | $ 91,689 |  | $ 3,145 |
Noncurrent assets | 383,056 |  | 375,367 |  | 12,807 |
Current liabilities | 66,143 |  | 63,218 |  | 2,211 |
Noncurrent liabilities | 26,713 |  | 19,309 |  | 893 |
Equity attributable to the parent | 374,157 |  | 374,672 |  | 12,510 |
NONCONTROLLING INTERESTS | 10,115 |  | 9,857 |  | $ 338 | $ 9,837
NET INCOME | 33,921 | $ 1,134 | 38,581 | $ 40,160 |  |
Profit attributable to the parent | 32,947 | 1,102 | 37,557 | 38,988 |  |
Profit attributable to noncontrolling interests | 974 | 32 | 1,024 | 1,172 |  |
Other comprehensive income (loss) for the year | 1,328 | 44 | (1,014) | (1,306) |  |
Total comprehensive income attributable to the parent | 34,282 | 1,146 | 36,552 | 37,705 |  |
Total comprehensive income attributable to noncontrolling interests | 967 | 32 | 1,015 | 1,149 |  |
TOTAL COMPREHENSIVE INCOME | 35,249 | 1,178 | 37,567 | 38,854 |  |
Net cash flow from operating activities | 72,427 | 2,421 | 66,366 | 70,932 |  |
Net cash flow from investing activities | (27,127) | (907) | (32,614) | (36,721) |  |
Net cash flow from financing activities | (38,934) | (1,302) | (35,035) | (36,608) |  |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 39 | 2 | 103 | 122 |  |
Net cash inflow | 6,405 | $ 214 | (1,180) | (2,275) |  |
Senao International Co., Ltd. (SENAO) [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Current assets | 6,751 |  | 7,041 |  |  |
Noncurrent assets | 3,173 |  | 2,527 |  |  |
Current liabilities | 3,637 |  | 3,757 |  |  |
Noncurrent liabilities | 590 |  | 164 |  |  |
Equity attributable to the parent | 1,551 |  | 1,539 |  |  |
NONCONTROLLING INTERESTS | 4,146 |  | 4,108 |  |  |
Revenue and income | 29,131 |  | 31,540 | 36,038 |  |
Costs and expenses | 28,725 |  | 31,081 | 35,200 |  |
NET INCOME | 406 |  | 459 | 838 |  |
Profit attributable to the parent | 115 |  | 133 | 246 |  |
Profit attributable to noncontrolling interests | 291 |  | 326 | 592 |  |
Other comprehensive income (loss) attributable to the parent | (7) |  | (2) | 3 |  |
Other comprehensive income (loss) attributable to noncontrolling interests | 22 |  | (10) | (17) |  |
Other comprehensive income (loss) for the year | 15 |  | (12) | (14) |  |
Total comprehensive income attributable to the parent | 108 |  | 131 | 249 |  |
Total comprehensive income attributable to noncontrolling interests | 313 |  | 316 | 575 |  |
TOTAL COMPREHENSIVE INCOME | 421 |  | 447 | 824 |  |
Net cash flow from operating activities | 538 |  | 696 | 1,081 |  |
Net cash flow from investing activities | 235 |  | (13) | (57) |  |
Net cash flow from financing activities | (718) |  | (491) | (897) |  |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 |  | 1 | (2) |  |
Net cash inflow | 55 |  | 193 | 125 |  |
Dividends paid to noncontrolling interests | 269 |  | 587 | 703 |  |
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Current assets | 3,710 |  | 4,417 |  |  |
Noncurrent assets | 4,044 |  | 2,779 |  |  |
Current liabilities | 1,316 |  | 1,076 |  |  |
Noncurrent liabilities | 22 |  | 1 |  |  |
Equity attributable to the parent | 2,199 |  | 2,097 |  |  |
NONCONTROLLING INTERESTS | 4,217 |  | 4,022 |  |  |
Revenue and income | 3,404 |  | 3,299 | 3,127 |  |
Costs and expenses | 2,775 |  | 2,549 | 2,402 |  |
NET INCOME | 629 |  | 750 | 725 |  |
Profit attributable to the parent | 215 |  | 273 | 294 |  |
Profit attributable to noncontrolling interests | 414 |  | 477 | 431 |  |
Other comprehensive income (loss) attributable to the parent | (1) |  | 0 | (1) |  |
Other comprehensive income (loss) attributable to noncontrolling interests | (2) |  | 0 | (2) |  |
Other comprehensive income (loss) for the year | (3) |  | 0 | (3) |  |
Total comprehensive income attributable to the parent | 214 |  | 273 | 293 |  |
Total comprehensive income attributable to noncontrolling interests | 412 |  | 477 | 429 |  |
TOTAL COMPREHENSIVE INCOME | 626 |  | 750 | 722 |  |
Net cash flow from operating activities | 507 |  | 862 | 1,052 |  |
Net cash flow from investing activities | (1,426) |  | (733) | (639) |  |
Net cash flow from financing activities | (349) |  | (328) | 2,306 |  |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | (5) |  | 1 | (4) |  |
Net cash inflow | (1,273) |  | (198) | 2,715 |  |
Dividends paid to noncontrolling interests | $ 216 |  | $ 210 | $ 146 |  |

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