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Additional Information of Expenses by Nature (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Additional Information of Expenses by Nature |
|  | Years Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
a. Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |
Recognized in cost of revenue |  | $ | 204,126.2 |  |  | $ | 203,476.8 |  |  | $ | 235,985.2 |
Recognized in operating expenses |  |  | 15,152.2 |  |  |  | 16,583.1 |  |  |  | 19,746.3 |
Recognized in other operating income and expenses |  |  | 25.0 |  |  |  | 25.1 |  |  |  | 64.5 |
|  | $ | 219,303.4 |  |  | $ | 220,085.0 |  |  | $ | 255,796.0 |
b. Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  |  |
Recognized in cost of revenue |  | $ | 1,642.1 |  |  | $ | 2,028.5 |  |  | $ | 2,135.5 |
Recognized in operating expenses |  |  | 1,560.1 |  |  |  | 1,714.9 |  |  |  | 2,211.2 |
|  | $ | 3,202.2 |  |  | $ | 3,743.4 |  |  | $ | 4,346.7 |
|  | Years Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
c. Research and development expenses |  | $ | 65,544.6 |  |  | $ | 71,207.7 |  |  | $ | 80,732.5 |
d. Employee benefits expenses |  |  |  |  |  |  |  |  |  |  |  |
Post-employment benefits |  |  |  |  |  |  |  |  |  |  |  |
Defined contribution plans |  | $ | 2,002.6 |  |  | $ | 2,164.9 |  |  | $ | 2,369.9 |
Defined benefit plans |  |  | 278.9 |  |  |  | 272.2 |  |  |  | 271.5 |
|  |  | 2,281.5 |  |  |  | 2,437.1 |  |  |  | 2,641.4 |
Other employee benefits |  |  | 88,929.4 |  |  |  | 97,248.0 |  |  |  | 101,488.7 |
|  | $ | 91,210.9 |  |  | $ | 99,685.1 |  |  | $ | 104,130.1 |
Employee benefits expense summarized by function |  |  |  |  |  |  |  |  |  |  |  |
Recognized in cost of revenue |  | $ | 52,983.2 |  |  | $ | 58,493.5 |  |  | $ | 61,026.1 |
Recognized in operating expenses |  |  | 38,227.7 |  |  |  | 41,191.6 |  |  |  | 43,104.0 |
|  | $ | 91,210.9 |  |  | $ | 99,685.1 |  |  | $ | 104,130.1 |

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