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Basis of preparation and summary of significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Estimated Useful Lives for the Current and Comparative

The estimated useful lives are as follows:

 

Buildings

    21 – 25 years

Mobile network infrastructure

    4 – 20 years

Fixed network infrastructure

    3 – 25 years

Call center equipment

    4 –   8 years

Equipment, fixtures and fittings

    2 – 10 years

Motor vehicles

    4 –   6 years

Central betting terminals

    5 – 10 years

Leasehold improvements

    3 –   5 years
Disclosure of Useful Lives for the Intangible Assets

The Group amortizes intangible assets with a limited useful life using the straight-line method over the following periods:

 

Transmission line software

    5 – 10 years

Central betting system operating right

    7 – 10 years

Customer base

    2 – 15 years

Brand name

    9 – 10 years

Indefeasible right of use

    15 years
Disclosure of Estimated Useful Lives for Investment Properties

The estimated useful lives are as follows:

Investment Property                                                                                 25 – 45 years
GSM and other telecommunication operating licenses [member]  
Disclosure of Useful Lives for the Intangible Assets

The useful lives for telecommunication licenses are as follows:

 

Telecommunications licenses    3 – 25 years
Computer software [member]  
Disclosure of Useful Lives for the Intangible Assets

The useful lives for computer software are as follows:

 

Computer software

    3 – 8 years