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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Operating Segments [Abstract] |
Analysis by Reportable Segment of Revenue and Operating Results of Continuing Operations | Analysis by reportable segment of revenue and operating results of continuing operations was as follows:
|  | Domestic Fixed Communi- cations Business |  |  | Mobile Communi- cations Business |  |  | Internet Business |  |  | International Fixed Communi- cations Business |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From external customers |  | $ | 72,535 |  |  | $ | 114,877 |  |  | $ | 25,777 |  |  | $ | 15,460 |  |  | $ | 3,146 |  |  | $ | 231,795 |
Intersegment revenues |  |  | 21,401 |  |  |  | 3,475 |  |  |  | 4,701 |  |  |  | 2,120 |  |  |  | 3,214 |  |  |  | 34,911 |
Segment revenues |  | $ | 93,936 |  |  | $ | 118,352 |  |  | $ | 30,478 |  |  | $ | 17,580 |  |  | $ | 6,360 |  |  |  | 266,706 |
Intersegment elimination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (34,911 | )
Consolidated revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 231,795 |
Segment income before income tax |  | $ | 23,231 |  |  | $ | 19,394 |  |  | $ | 9,918 |  |  | $ | 1,120 |  |  | $ | (1,710 | ) |  | $ | 51,953 |
Year ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From external customers |  | $ | 72,784 |  |  | $ | 110,801 |  |  | $ | 28,100 |  |  | $ | 14,434 |  |  | $ | 3,872 |  |  | $ | 229,991 |
Intersegment revenues |  |  | 22,669 |  |  |  | 2,530 |  |  |  | 4,734 |  |  |  | 2,680 |  |  |  | 4,122 |  |  |  | 36,735 |
Segment revenues |  | $ | 95,453 |  |  | $ | 113,331 |  |  | $ | 32,834 |  |  | $ | 17,114 |  |  | $ | 7,994 |  |  |  | 266,726 |
Intersegment elimination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (36,735 | )
Consolidated revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 229,991 |
Segment income before income tax |  | $ | 25,658 |  |  | $ | 13,926 |  |  | $ | 10,729 |  |  | $ | 1,098 |  |  | $ | (1,998 | ) |  | $ | 49,413 |
Year ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From external customers |  | $ | 71,137 |  |  | $ | 109,376 |  |  | $ | 28,917 |  |  | $ | 13,552 |  |  | $ | 4,532 |  |  | $ | 227,514 |
Intersegment revenues |  |  | 22,515 |  |  |  | 2,031 |  |  |  | 4,209 |  |  |  | 2,375 |  |  |  | 4,600 |  |  |  | 35,730 |
Segment revenues |  | $ | 93,652 |  |  | $ | 111,407 |  |  | $ | 33,126 |  |  | $ | 15,927 |  |  | $ | 9,132 |  |  |  | 263,244 |
Intersegment elimination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (35,730 | )
Consolidated revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 227,514 |
Segment income before income tax |  | $ | 24,888 |  |  | $ | 12,433 |  |  | $ | 11,118 |  |  | $ | 1,029 |  |  | $ | (1,459 | ) |  | $ | 48,009 |
Other Segment Information | Other information reviewed by the chief operating decision maker or regularly provided to the chief operating decision maker was as follows: For the year ended December 31, 2015
|  | Domestic Fixed Communi-cations Business |  |  | Mobile Communi-cations Business |  |  | Internet Business |  |  | International Fixed Communi-cations Business |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Share of the profit of associates and joint ventures accounted for using equity method |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 897 |  |  | $ | 897 |
Interest income |  | $ | 19 |  |  | $ | 19 |  |  | $ | 11 |  |  | $ | 2 |  |  | $ | 255 |  |  | $ | 306 |
Interest expenses |  | $ | — |  |  | $ | 10 |  |  | $ | — |  |  | $ | — |  |  | $ | 23 |  |  | $ | 33 |
Operating costs and expenses |  | $ | 64,960 |  |  | $ | 81,213 |  |  | $ | 12,062 |  |  | $ | 14,411 |  |  | $ | 8,683 |  |  | $ | 181,329 |
Depreciation and amortization |  | $ | 17,487 |  |  | $ | 10,444 |  |  | $ | 3,611 |  |  | $ | 1,536 |  |  | $ | 370 |  |  | $ | 33,448 |
Capital expenditure |  | $ | 10,196 |  |  | $ | 8,596 |  |  | $ | 4,795 |  |  | $ | 968 |  |  | $ | 529 |  |  | $ | 25,084 |
Impairment loss on property, plant and equipment |  | $ | 22 |  |  | $ | 116 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 138 |
Reversal of impairment loss on investment properties |  | $ | 142 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 142 |
For the year ended December 31, 2016
|  | Domestic Fixed Communi- cations Business |  |  | Mobile Communi- cations Business |  |  | Internet Business |  |  | International Fixed Communi- cations Business |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Share of the profit of associates and joint ventures accounted for using equity method |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 515 |  |  | $ | 515 |
Interest income |  | $ | 15 |  |  | $ | 11 |  |  | $ | 7 |  |  | $ | 6 |  |  | $ | 150 |  |  | $ | 189 |
Interest expenses |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | 18 |  |  | $ | 20 |
Operating costs and expenses |  | $ | 64,230 |  |  | $ | 79,593 |  |  | $ | 13,160 |  |  | $ | 14,313 |  |  | $ | 10,094 |  |  | $ | 181,390 |
Depreciation and amortization |  | $ | 16,414 |  |  | $ | 10,620 |  |  | $ | 3,626 |  |  | $ | 1,451 |  |  | $ | 374 |  |  | $ | 32,485 |
Capital expenditure |  | $ | 9,846 |  |  | $ | 8,981 |  |  | $ | 2,718 |  |  | $ | 1,136 |  |  | $ | 836 |  |  | $ | 23,517 |
Impairment loss on property, plant and equipment |  | $ | — |  |  | $ | 596 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 596 |
Reversal of impairment loss on investment properties |  | $ | 148 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 148 |
For the year ended December 31, 2017
|  | Domestic Fixed Communi- cations Business |  |  | Mobile Communi- cations Business |  |  | Internet Business |  |  | International Fixed Communi- cations Business |  |  | Others |  |  | Total |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Share of the profit of associates and joint ventures accounted for using equity method |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 419 |  |  | $ | 419 |
Interest income |  | $ | 21 |  |  | $ | 15 |  |  | $ | 9 |  |  | $ | 15 |  |  | $ | 145 |  |  | $ | 205 |
Interest expenses |  | $ | — |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |  |  | $ | 16 |  |  | $ | 22 |
Operating costs and expenses |  | $ | 62,795 |  |  | $ | 80,275 |  |  | $ | 13,288 |  |  | $ | 13,385 |  |  | $ | 10,963 |  |  | $ | 180,706 |
Depreciation and amortization |  | $ | 15,614 |  |  | $ | 11,001 |  |  | $ | 3,385 |  |  | $ | 1,477 |  |  | $ | 453 |  |  | $ | 31,930 |
Capital expenditure |  | $ | 11,647 |  |  | $ | 9,742 |  |  | $ | 2,779 |  |  | $ | 1,580 |  |  | $ | 1,127 |  |  | $ | 26,875 |
Impairment loss on property, plant and equipment |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Reversal of impairment loss on investment properties |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |
Main Products and Service Revenues | The following is an analysis of the Company’s revenue from its major products and services.
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Mobile services revenue |  | $ | 80,867 |  |  | $ | 78,788 |  |  | $ | 75,823 |
Local telephone and domestic long distance telephone services revenue |  |  | 36,690 |  |  |  | 34,531 |  |  |  | 32,247 |
Sales of product |  |  | 36,509 |  |  |  | 35,377 |  |  |  | 37,649 |
Broadband access and domestic leased line services revenue |  |  | 23,711 |  |  |  | 23,315 |  |  |  | 22,950 |
Data communications internet services revenue |  |  | 17,455 |  |  |  | 20,906 |  |  |  | 21,143 |
International network and leased telephone services revenue |  |  | 11,319 |  |  |  | 10,634 |  |  |  | 9,328 |
Others |  |  | 25,244 |  |  |  | 26,440 |  |  |  | 28,374 |
|  | $ | 231,795 |  |  | $ | 229,991 |  |  | $ | 227,514 |
Geographic Information | The geographic information for revenues was as follows:
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |
Taiwan, ROC |  | $ | 220,917 |  |  | $ | 218,933 |  |  | $ | 217,568 |
Overseas |  |  | 10,878 |  |  |  | 11,058 |  |  |  | 9,946 |
|  | $ | 231,795 |  |  | $ | 229,991 |  |  | $ | 227,514 |

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