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v3.19.1

Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
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Summary of Estimated Useful Lives of Property, Plant and Equipment | Depreciation of all property, plant and equipment, except for land, is calculated using the straight-line method to allocate their cost, net of their residual values, over their estimated useful lives as follows:
|  | Estimated Useful Life
Buildings |  | 5 – 40 years
Structures |  | 5 – 40 years
Machinery and equipment (Telecommunications equipment and others) |  | 2 – 40 years
Others |  |
Vehicles |  | 4 – 6 years
Tools |  | 4 – 6 years
Office equipment |  | 2 – 6 years
Summary of Amortization of Intangible Assets With Limited Useful Life | The Group amortizes intangible assets with a limited useful life using the straight-line method over the following periods:
|  | Estimated Useful Life
Development costs |  | 5 – 6 years
Software |  | 6 years
Industrial property rights |  | 5 – 50 years
Frequency usage rights |  | 5 – 10 years
Others1 |  | 2 – 50 years
| 1 | Membership rights (condominium membership and golf membership) and broadcast license included in others are classified as intangible assets with indefinite useful life.

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- Definition The disclosure of detailed information about useful lives of intangible assets. + References No definition available. + Details
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- Definition The tabular disclosure of property plant and equipment estimated useful life. + References No definition available. + Details
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