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Subsidiaries - Summarized Financial Information Before Intercompany Eliminations (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($) | Jan. 01, 2018 TWD ($) | Dec. 31, 2017 USD ($)
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Current assets | $ 79,334 |  | $ 81,620 |  |  | $ 2,677
Noncurrent assets | 371,568 |  | 365,295 |  |  | 12,536
Current liabilities | 63,939 |  | 64,160 |  |  | 2,157
Noncurrent liabilities | 17,553 |  | 15,827 |  |  | 593
Equity attributable to the parent | 360,936 |  | 360,656 |  |  | 12,177
NONCONTROLLING INTERESTS | 8,474 |  | 6,272 |  | $ 8,470 | $ 286
NET INCOME | 40,160 | $ 1,355 | 41,626 | $ 42,852 |  |
Profit attributable to the parent | 38,988 | 1,315 | 40,485 | 42,039 |  |
Profit Allocated to Noncontrolling Interests | 1,172 | 40 | 1,141 | 813 |  |
Other comprehensive loss for the year | (1,306) | (44) | (2,056) | (833) |  |
Total comprehensive income attributable to the parent | 37,705 | 1,272 | 38,486 | 41,207 |  |
Total comprehensive income attributable to noncontrolling interests | 1,149 | 39 | 1,084 | 812 |  |
TOTAL COMPREHENSIVE INCOME | 38,854 | 1,311 | 39,570 | 42,019 |  |
Net cash flow from operating activities | 70,932 | 2,393 | 64,952 | 76,325 |  |
Net cash flow from investing activities | (36,721) | (1,239) | (21,663) | (30,453) |  |
Net cash flow from financing activities | (36,608) | (1,234) | (42,518) | (39,186) |  |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 122 | 4 | 58 | 25 |  |
Net cash inflow (outflow) | (2,275) | (76) | 829 | 6,711 |  |
Stockholders of the parent | 38,988 | 1,315 | 40,485 | 42,039 |  |
Noncontrolling interests | 1,172 | 40 | 1,141 | 813 |  |
Stockholders of the parent | 37,705 | $ 1,272 | 38,486 | 41,207 |  |
Senao International Co., Ltd. (SENAO) [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Current assets | 7,584 |  | 7,762 |  |  |
Noncurrent assets | 2,531 |  | 2,535 |  |  |
Current liabilities | 4,278 |  | 4,466 |  |  |
Noncurrent liabilities | 160 |  | 155 |  |  |
Equity attributable to the parent | 1,585 |  | 1,607 |  |  |
NONCONTROLLING INTERESTS | 4,092 |  | 4,069 |  |  |
Revenue and income | 36,038 |  | 34,453 | 35,944 |  |
Costs and expenses | 35,200 |  | 33,476 | 35,171 |  |
NET INCOME | 838 |  | 977 | 773 |  |
Profit attributable to the parent | 246 |  | 287 | 222 |  |
Profit Allocated to Noncontrolling Interests | 592 |  | 690 | 551 |  |
Other comprehensive income (loss) attributable to the parent | 3 |  | (21) | (1) |  |
Other comprehensive loss attributable to noncontrolling interests | (17) |  | (53) | (2) |  |
Other comprehensive loss for the year | (14) |  | (74) | (3) |  |
Total comprehensive income attributable to the parent | 249 |  | 266 | 222 |  |
Total comprehensive income attributable to noncontrolling interests | 575 |  | 637 | 548 |  |
TOTAL COMPREHENSIVE INCOME | 824 |  | 903 | 770 |  |
Dividends paid to noncontrolling interests | 703 |  | 526 | 274 |  |
Net cash flow from operating activities | 1,081 |  | 531 | 1,739 |  |
Net cash flow from investing activities | (57) |  | 130 | 54 |  |
Net cash flow from financing activities | (897) |  | (677) | (1,530) |  |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | (2) |  | (7) | 11 |  |
Net cash inflow (outflow) | 125 |  | (23) | 274 |  |
Stockholders of the parent | 246 |  | 287 | 222 |  |
Noncontrolling interests | 592 |  | 690 | 551 |  |
Stockholders of the parent | 249 |  | 266 | 222 |  |
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member] |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |
Current assets | 4,496 |  | 2,116 |  |  |
Noncurrent assets | 2,167 |  | 1,872 |  |  |
Current liabilities | 965 |  | 1,323 |  |  |
Noncurrent liabilities | 1 |  | 1 |  |  |
Equity attributable to the parent | 2,184 |  | 1,089 |  |  |
NONCONTROLLING INTERESTS | 3,513 |  | 1,575 |  |  |
Revenue and income | 3,127 |  | 2,607 | 1,735 |  |
Costs and expenses | 2,402 |  | 2,020 | 1,341 |  |
NET INCOME | 725 |  | 587 | 394 |  |
Profit attributable to the parent | 294 |  | 246 | 182 |  |
Profit Allocated to Noncontrolling Interests | 431 |  | 341 | 212 |  |
Other comprehensive income (loss) attributable to the parent | (1) |  | 0 | 0 |  |
Other comprehensive loss attributable to noncontrolling interests | (2) |  | 0 | 0 |  |
Other comprehensive loss for the year | (3) |  | 0 | 0 |  |
Total comprehensive income attributable to the parent | 293 |  | 246 | 182 |  |
Total comprehensive income attributable to noncontrolling interests | 429 |  | 341 | 212 |  |
TOTAL COMPREHENSIVE INCOME | 722 |  | 587 | 394 |  |
Dividends paid to noncontrolling interests | 146 |  | 109 | 35 |  |
Net cash flow from operating activities | 1,052 |  | 671 | 532 |  |
Net cash flow from investing activities | (639) |  | (904) | (200) |  |
Net cash flow from financing activities | 2,306 |  | 841 | (112) |  |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | (4) |  | (2) | 3 |  |
Net cash inflow (outflow) | 2,715 |  | 606 | 223 |  |
Stockholders of the parent | 294 |  | 246 | 182 |  |
Noncontrolling interests | 431 |  | 341 | 212 |  |
Stockholders of the parent | $ 293 |  | $ 246 | $ 182 |  |

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