Derivative Instruments (Interest Rate Swaps) (Schedule) (Details) (Interest Rate Swap [Member]) In Millions, unless otherwise specified						12 Months Ended		12 Months Ended				12 Months Ended																											12 Months Ended																							12 Months Ended																	12 Months Ended									12 Months Ended
	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] October 2018 2155.0 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] January 2021 650.0 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] January 2021 650.0 GBP 3.87% [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] December 2015 600.0 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] April 2018 300.0 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] October 2018 2155.0 GBP [Member]	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] January 2021 650.0 GBP [Member]	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] January 2021 650.0 GBP 3.87% [Member]	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] December 2015 600.0 GBP [Member]	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] April 2018 300.0 GBP [Member]	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] October 2018 2155.0 GBP [Member]	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] January 2021 650.0 GBP [Member]	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] January 2021 650.0 GBP 3.87% [Member]	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] December 2015 600.0 GBP [Member]	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] April 2018 300.0 GBP [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] July 2020 1000Usd 6mo.Libor plus 3.03Percent [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2022 750.0 USD [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 1,554.0 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 - January 2016 1,554.0 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 1364.8 EUR 3.44% [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] July 2020 750.0 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 - January 2021 750.0 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 to December 2016 500Euro 4.32Percent [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 - January 2023 290.0 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] December 2015 263.3 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2023 210.0 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 - January 2018 175.0 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 to July 2020 171.3Euro 3.95Percent [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] July 2020 171.3Euro 4.32Percent [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 - November 2021 107.0 EUR 2.89 Percent [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 2380.0 CHF 2.81% [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 - January 2022 711.5 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 — January 2021 500.0 CHF 1.65% [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 - January 2021 400.0 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 to December 2016 370.9Chf 3.82Percent [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] January 2015 to November 2019 226.8 CHF 6.88 Percent [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] July 2020 1000Usd 6mo.Libor plus 3.03Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2022 750.0 USD [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 1,554.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - January 2016 1,554.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 1364.8 EUR 3.44% [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - January 2021 750.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 to December 2016 500Euro 4.32Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - January 2023 290.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] December 2015 263.3 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2023 210.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - January 2018 175.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 to July 2020 171.3Euro 3.95Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] July 2020 171.3Euro 4.32Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - November 2021 107.0 EUR 2.89 Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 2380.0 CHF 2.81% [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - January 2022 711.5 CHF [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 — January 2021 500.0 CHF 1.65% [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - January 2021 400.0 CHF [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 to December 2016 370.9Chf 3.82Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 to November 2019 226.8 CHF 6.88 Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] July 2020 1000Usd 6mo.Libor plus 3.03Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2022 750.0 USD [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 1,554.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - January 2016 1,554.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 1364.8 EUR 3.44% [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] July 2020 750.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - January 2021 750.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 to December 2016 500Euro 4.32Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - January 2023 290.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] December 2015 263.3 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2023 210.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - January 2018 175.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 to July 2020 171.3Euro 3.95Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] July 2020 171.3Euro 4.32Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - November 2021 107.0 EUR 2.89 Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 2380.0 CHF 2.81% [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - January 2022 711.5 CHF [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 — January 2021 500.0 CHF 1.65% [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - January 2021 400.0 CHF [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 to December 2016 370.9Chf 3.82Percent [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 to November 2019 226.8 CHF 6.88 Percent [Member]	Dec. 31, 2014 Amsterdamse Beheer-en Consultingmaatschappij BV (ABC B.V.), a subsidiary of Ziggo [Member] January 2022 1,556.0 EUR [Member] EUR (€)	Dec. 31, 2014 Amsterdamse Beheer-en Consultingmaatschappij BV (ABC B.V.), a subsidiary of Ziggo [Member] Due From Counterparty [Member] January 2022 1,556.0 EUR [Member]	Dec. 31, 2014 Amsterdamse Beheer-en Consultingmaatschappij BV (ABC B.V.), a subsidiary of Ziggo [Member] Due To Counterparty [Member] January 2022 1,556.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] June 2023 500.0 EUR [Member] EUR (€)	Dec. 31, 2014 Telenet NV [Member] July 2017 - June 2022 420.0 EUR [Member] EUR (€)	Dec. 31, 2014 Telenet NV [Member] June 2021 400.0 EUR [Member] EUR (€)	Dec. 31, 2014 Telenet NV [Member] July 2017 - June 2023 382.0 EUR [Member] EUR (€)	Dec. 31, 2014 Telenet NV [Member] July 2017 150.0 EUR [Member] EUR (€)	Dec. 31, 2014 Telenet NV [Member] August 2015 - June 2022 55.0 EUR [Member] EUR (€)	Dec. 31, 2014 Telenet NV [Member] June 2015 50Euro 3.55Percent [Member] EUR (€)	Dec. 31, 2014 Telenet NV [Member] Due From Counterparty [Member] June 2023 500.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due From Counterparty [Member] July 2017 - June 2022 420.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due From Counterparty [Member] June 2021 400.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due From Counterparty [Member] July 2017 - June 2023 382.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due From Counterparty [Member] July 2017 150.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due From Counterparty [Member] August 2015 - June 2022 55.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due From Counterparty [Member] June 2015 50Euro 3.55Percent [Member]	Dec. 31, 2014 Telenet NV [Member] Due To Counterparty [Member] June 2023 500.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due To Counterparty [Member] July 2017 - June 2022 420.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due To Counterparty [Member] June 2021 400.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due To Counterparty [Member] July 2017 - June 2023 382.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due To Counterparty [Member] July 2017 150.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due To Counterparty [Member] August 2015 - June 2022 55.0 EUR [Member]	Dec. 31, 2014 Telenet NV [Member] Due To Counterparty [Member] June 2015 50Euro 3.55Percent [Member]
Derivative [Line Items]
Notional amount of derivative	£ 2,155.0	£ 650.0	£ 650.0	£ 600.0	£ 300.0											$ 1,000.0	$ 750.0	€ 1,554.0	€ 1,554.0	€ 1,364.8	€ 750.0	€ 750.0	€ 500.0	€ 290.0	€ 263.3	€ 210.0	€ 175.0	€ 171.3	€ 171.3	€ 107.0	2,380.0	711.5	500.0	400.0	370.9	226.8																																										€ 1,566.0			€ 500.0	€ 420.0	€ 400.0	€ 382.0	€ 150.0	€ 55.0	€ 50.0
Derivative Interest Rate							5.50%				1.52%		3.87%	2.90%	1.37%																						6.63%	6.88%																							3.44%	6.38%	2.57%	4.32%	2.79%	3.97%	2.88%	3.74%	3.95%	4.32%	2.89%	2.81%	1.89%	1.65%	2.51%	3.82%	6.88%			1.66%															1.45%	2.08%	0.41%	1.89%	3.55%	1.81%	3.55%
Derivative Interest Rate Referenced						6 mo. GBP LIBOR		6 mo. GBP LIBOR	6 mo. GBP LIBOR	6 mo. GBP LIBOR		6 mo. GBP LIBOR																											1 mo. EURIBOR	1 mo. EURIBOR	6 mo. EURIBOR	6 mo. EURIBOR	6 mo. EURIBOR	6 mo. EURIBOR	6 mo. EURIBOR	6 mo. EURIBOR	6 mo. EURIBOR	6 mo. EURIBOR	6 mo. EURIBOR	6 mo. EURIBOR	6 mo. CHF LIBOR	6 mo. CHF LIBOR	6 mo. CHF LIBOR	6 mo. CHF LIBOR	6 mo. CHF LIBOR	6 mo. CHF LIBOR	6 mo. LIBOR	6 mo. LIBOR	6 mo. EURIBOR	6 mo. EURIBOR		6 mo. EURIBOR																	6 mo. EURIBOR									3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR
Derivative Interest Rate Above Referenced Rate								1.84%				1.84%																											3.75%	3.75%																5.01%	3.03%	4.89%	3.56%	3.58%		3.16%