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Subsidiaries - Summarized Financial Information Before Intercompany Eliminations (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2018 USD ($)
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Current assets | $ 91,689 |  | $ 79,334 |  | $ 2,995
Noncurrent assets | 375,367 |  | 371,568 |  | 12,263
Current liabilities | 63,218 |  | 63,939 |  | 2,065
Noncurrent liabilities | 19,309 |  | 17,553 |  | 631
Equity attributable to the parent | 374,672 |  | 360,936 |  | 12,240
NONCONTROLLING INTERESTS | 9,857 |  | 8,474 |  | $ 322
NET INCOME | 38,581 | $ 1,260 | 40,160 | $ 41,626 |
Profit attributable to the parent | 37,557 | 1,227 | 38,988 | 40,485 |
Profit attributable to noncontrolling interests | 1,024 | 33 | 1,172 | 1,141 |
Other comprehensive loss for the year | (1,014) | (33) | (1,306) | (2,056) |
Total comprehensive income attributable to the parent | 36,552 | 1,194 | 37,705 | 38,486 |
Total comprehensive income attributable to noncontrolling interests | 1,015 | 33 | 1,149 | 1,084 |
TOTAL COMPREHENSIVE INCOME | 37,567 | 1,227 | 38,854 | 39,570 |
Net cash flow from operating activities | 66,366 | 2,168 | 70,932 | 64,952 |
Net cash flow from investing activities | (32,614) | (1,066) | (36,721) | (21,663) |
Net cash flow from financing activities | (35,035) | (1,144) | (36,608) | (42,518) |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 103 | 3 | 122 | 58 |
Net cash inflow (outflow) | (1,180) | $ (39) | (2,275) | 829 |
Senao International Co., Ltd. (SENAO) [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Current assets | 7,041 |  | 7,584 |  |
Noncurrent assets | 2,527 |  | 2,531 |  |
Current liabilities | 3,757 |  | 4,278 |  |
Noncurrent liabilities | 164 |  | 160 |  |
Equity attributable to the parent | 1,539 |  | 1,585 |  |
NONCONTROLLING INTERESTS | 4,108 |  | 4,092 |  |
Revenue and income | 31,540 |  | 36,038 | 34,453 |
Costs and expenses | 31,081 |  | 35,200 | 33,476 |
NET INCOME | 459 |  | 838 | 977 |
Profit attributable to the parent | 133 |  | 246 | 287 |
Profit attributable to noncontrolling interests | 326 |  | 592 | 690 |
Other comprehensive income (loss) attributable to the parent | (2) |  | 3 | (21) |
Other comprehensive loss attributable to noncontrolling interests | (10) |  | (17) | (53) |
Other comprehensive loss for the year | (12) |  | (14) | (74) |
Total comprehensive income attributable to the parent | 131 |  | 249 | 266 |
Total comprehensive income attributable to noncontrolling interests | 316 |  | 575 | 637 |
TOTAL COMPREHENSIVE INCOME | 447 |  | 824 | 903 |
Dividends paid to noncontrolling interests | 587 |  | 703 | 526 |
Net cash flow from operating activities | 696 |  | 1,081 | 531 |
Net cash flow from investing activities | (13) |  | (57) | 130 |
Net cash flow from financing activities | (491) |  | (897) | (677) |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 1 |  | (2) | (7) |
Net cash inflow (outflow) | 193 |  | 125 | (23) |
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Current assets | 4,417 |  | 4,496 |  |
Noncurrent assets | 2,779 |  | 2,167 |  |
Current liabilities | 1,076 |  | 965 |  |
Noncurrent liabilities | 1 |  | 1 |  |
Equity attributable to the parent | 2,097 |  | 2,184 |  |
NONCONTROLLING INTERESTS | 4,022 |  | 3,513 |  |
Revenue and income | 3,299 |  | 3,127 | 2,607 |
Costs and expenses | 2,549 |  | 2,402 | 2,020 |
NET INCOME | 750 |  | 725 | 587 |
Profit attributable to the parent | 273 |  | 294 | 246 |
Profit attributable to noncontrolling interests | 477 |  | 431 | 341 |
Other comprehensive income (loss) attributable to the parent | 0 |  | (1) | 0 |
Other comprehensive loss attributable to noncontrolling interests | 0 |  | (2) | 0 |
Other comprehensive loss for the year | 0 |  | (3) | 0 |
Total comprehensive income attributable to the parent | 273 |  | 293 | 246 |
Total comprehensive income attributable to noncontrolling interests | 477 |  | 429 | 341 |
TOTAL COMPREHENSIVE INCOME | 750 |  | 722 | 587 |
Dividends paid to noncontrolling interests | 210 |  | 146 | 109 |
Net cash flow from operating activities | 862 |  | 1,052 | 671 |
Net cash flow from investing activities | (733) |  | (639) | (904) |
Net cash flow from financing activities | (328) |  | 2,306 | 841 |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 1 |  | (4) | (2) |
Net cash inflow (outflow) | $ (198) |  | $ 2,715 | $ 606 |

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