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Additional Information of Expenses by Nature (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of Additional Information of Expenses by Nature |
|  | Years Ended December 31 |
|  | 2016 |  |  | 2017 |  |  | 2018 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
a.   Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |
Recognized in cost of revenue |  | $ | 203,476.8 |  |  | $ | 235,985.2 |  |  | $ | 264,804.7 |
Recognized in operating expenses |  |  | 16,583.1 |  |  |  | 19,746.3 |  |  |  | 23,292.3 |
Recognized in other operating income and expenses |  |  | 25.1 |  |  |  | 64.5 |  |  |  | 27.9 |
|  | $ | 220,085.0 |  |  | $ | 255,796.0 |  |  | $ | 288,124.9 |
b.  Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  |  |
Recognized in cost of revenue |  | $ | 2,028.5 |  |  | $ | 2,135.5 |  |  | $ | 2,073.5 |
Recognized in operating expenses |  |  | 1,714.9 |  |  |  | 2,211.2 |  |  |  | 2,347.9 |
|  | $ | 3,743.4 |  |  | $ | 4,346.7 |  |  | $ | 4,421.4 |
c.   Research and development costs expensed as incurred |  | $ | 71,207.7 |  |  | $ | 80,732.5 |  |  | $ | 85,895.6 |
|  | Years Ended December 31 |
|  | 2016 |  |  | 2017 |  |  | 2018 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
d.  Employee benefits expenses |  |  |  |  |  |  |  |  |  |  |  |
Post-employment benefits |  |  |  |  |  |  |  |  |  |  |  |
Defined contribution plans |  | $ | 2,164.9 |  |  | $ | 2,369.9 |  |  | $ | 2,568.9 |
Defined benefit plans |  |  | 272.2 |  |  |  | 271.5 |  |  |  | 281.8 |
|  |  | 2,437.1 |  |  |  | 2,641.4 |  |  |  | 2,850.7 |
Other employee benefits |  |  | 97,248.0 |  |  |  | 101,488.7 |  |  |  | 105,364.2 |
|  | $ | 99,685.1 |  |  | $ | 104,130.1 |  |  | $ | 108,214.9 |
Employee benefits expense summarized by function |  |  |  |  |  |  |  |  |  |  |  |
Recognized in cost of revenue |  | $ | 58,493.5 |  |  | $ | 61,026.1 |  |  | $ | 63,597.7 |
Recognized in operating expenses |  |  | 41,191.6 |  |  |  | 43,104.0 |  |  |  | 44,617.2 |
|  | $ | 99,685.1 |  |  | $ | 104,130.1 |  |  | $ | 108,214.9 |

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