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summary of significant accounting policies - Useful lives intangible assets (Details) | 12 Months Ended
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Dec. 31, 2018
Wireline subscriber base |
Useful Lives of Intangible Assets Other Than Goodwill |
Estimated useful lives of purchased intangible assets other than goodwill | 25 years
Customer contracts and related customer relationships | Minimum |
Useful Lives of Intangible Assets Other Than Goodwill |
Estimated useful lives of purchased intangible assets other than goodwill | 4 years
Customer contracts and related customer relationships | Maximum |
Useful Lives of Intangible Assets Other Than Goodwill |
Estimated useful lives of purchased intangible assets other than goodwill | 10 years
Software | Minimum |
Useful Lives of Intangible Assets Other Than Goodwill |
Estimated useful lives of purchased intangible assets other than goodwill | 2 years
Software | Maximum |
Useful Lives of Intangible Assets Other Than Goodwill |
Estimated useful lives of purchased intangible assets other than goodwill | 10 years
Access to rights-of-way and other | Minimum |
Useful Lives of Intangible Assets Other Than Goodwill |
Estimated useful lives of purchased intangible assets other than goodwill | 5 years
Access to rights-of-way and other | Maximum |
Useful Lives of Intangible Assets Other Than Goodwill |
Estimated useful lives of purchased intangible assets other than goodwill | 30 years

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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