Fair Value Measurements (Narrative) (Details)		6 Months Ended
Jun. 30, 2014 Equity Contract [Member]	Jun. 30, 2013 Virgin Media Acquisition [Member] Customer Relationships [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated volatilities	22.20%
Discount rate		9.00%

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration