v3.10.0.1

Basis of Presentation (Narrative) (Details) | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 04, 2017
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Telenet |  |  |
Basis of Presentation [Line Items] |  |  |
Ownership percentage | 59.70% |  |
VodafoneZiggo JV |  |  |
Basis of Presentation [Line Items] |  |  |
Ownership percentage | 50.00% | 50.00% | 50.00%
Liberty Puerto Rico |  |  |
Basis of Presentation [Line Items] |  |  |
Ownership percentage | 60.00% |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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