Derivative Instruments (Interest Rate Swaps) (Schedule) (Details) (Interest Rate Swap [Member]) In Millions, unless otherwise specified																																										3 Months Ended		3 Months Ended					3 Months Ended			3 Months Ended																																3 Months Ended				3 Months Ended				3 Months Ended
	Mar. 31, 2014 October 2018 2155.0 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Mar. 31, 2014 January 2021 650.0 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Mar. 31, 2014 January 2021 650.0 GBP 3.87% [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Mar. 31, 2014 December 2015 600.0 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Mar. 31, 2014 April 2018 300.0 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Mar. 31, 2014 July 2020 1000Usd 6mo.Libor plus 3.03Percent [Member] UPC Broadband Holding [Member] USD ($)	Mar. 31, 2014 January 2022 750.0 USD [Member] UPC Broadband Holding [Member] USD ($)	Mar. 31, 2014 January 2015 1,554.0 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 January 2015 1364.8 EUR 3.44% [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 July 2020 750.0 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 January 2015 - January 2021 750.0 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 January 2015 to December 2016 500Euro 4.32Percent [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 July 2014 337Euro 3.94Percent [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 January 2015 - January 2023 290.0 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 December 2015 263.3Euro 3.97Percent [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 January 2023 210.0 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 January 2015 to January 2018 175Euro 3.74Percent [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 January 2015 to July 2020 171.3Euro 3.95Percent [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 July 2020 171.3Euro 4.32Percent [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 December 2014 107.0 EUR 4.73 Percent [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 January 2015 - November 2021 107.0 EUR 2.89 Percent [Member] UPC Broadband Holding [Member] EUR (€)	Mar. 31, 2014 January 2015 2380.0 CHF 2.81% [Member] UPC Broadband Holding [Member] CHF	Mar. 31, 2014 January 2015 - January 2022 711.5 CHF [Member] UPC Broadband Holding [Member] CHF	Mar. 31, 2014 January 2015 — January 2021 500.0 CHF 1.65% [Member] UPC Broadband Holding [Member] CHF	Mar. 31, 2014 January 2015 - January 2018 400.0 CHF [Member] UPC Broadband Holding [Member] CHF	Mar. 31, 2014 January 2015 to December 2016 370.9Chf 3.82Percent [Member] UPC Broadband Holding [Member] CHF	Mar. 31, 2014 January 2015 to November 2019 226.8 CHF 6.88 Percent [Member] UPC Broadband Holding [Member] CHF	Mar. 31, 2014 July 2017 to July 2019 600.0 EUR [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 August 2015 350Euro 3.54Percent [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 August 2015 to December 2018 350.0 EUR [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 December 2015 to June 2021 EUR250.0 3.49% [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 July 2019 200.0 EUR [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 July 2017 150.0 EUR [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 July 2017 to December 2018 70.0 EUR [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 June 2021 55.0 EUR [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 June 2015 50Euro 3.55Percent [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 December 2017 50Euro 3.52Percent [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 December 2015 to July 2019 50.0 EUR [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 December 2017 to July 2019 50.0 EUR [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 July 2017 to June 2021 EUR 50 3.00% [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 August 2015 to June 2021 EUR 45.0 3.20% [Member] Telenet International [Member] EUR (€)	Mar. 31, 2014 Due From Counterparty [Member] October 2018 2155.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2021 650.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2021 650.0 GBP 3.87% [Member] Virgin Media Investment Holdings Limited [Member]	Mar. 31, 2014 Due From Counterparty [Member] December 2015 600.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]	Mar. 31, 2014 Due From Counterparty [Member] April 2018 300.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]	Mar. 31, 2014 Due From Counterparty [Member] July 2020 1000Usd 6mo.Libor plus 3.03Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2022 750.0 USD [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 1,554.0 EUR [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 1364.8 EUR 3.44% [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] July 2020 750.0 EUR [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 - January 2021 750.0 EUR [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 to December 2016 500Euro 4.32Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] July 2014 337Euro 3.94Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 - January 2023 290.0 EUR [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] December 2015 263.3Euro 3.97Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2023 210.0 EUR [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 to January 2018 175Euro 3.74Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 to July 2020 171.3Euro 3.95Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] July 2020 171.3Euro 4.32Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] December 2014 107.0 EUR 4.73 Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 - November 2021 107.0 EUR 2.89 Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 2380.0 CHF 2.81% [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 - January 2022 711.5 CHF [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 — January 2021 500.0 CHF 1.65% [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 - January 2018 400.0 CHF [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 to December 2016 370.9Chf 3.82Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] January 2015 to November 2019 226.8 CHF 6.88 Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due From Counterparty [Member] July 2017 to July 2019 600.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] August 2015 350Euro 3.54Percent [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] August 2015 to December 2018 350.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] December 2015 to June 2021 EUR250.0 3.49% [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] July 2019 200.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] July 2017 150.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] July 2017 to December 2018 70.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] June 2021 55.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] June 2015 50Euro 3.55Percent [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] December 2017 50Euro 3.52Percent [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] December 2015 to July 2019 50.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] December 2017 to July 2019 50.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] July 2017 to June 2021 EUR 50 3.00% [Member] Telenet International [Member]	Mar. 31, 2014 Due From Counterparty [Member] August 2015 to June 2021 EUR 45.0 3.20% [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] October 2018 2155.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2021 650.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2021 650.0 GBP 3.87% [Member] Virgin Media Investment Holdings Limited [Member]	Mar. 31, 2014 Due To Counterparty [Member] December 2015 600.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]	Mar. 31, 2014 Due To Counterparty [Member] April 2018 300.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]	Mar. 31, 2014 Due To Counterparty [Member] July 2020 1000Usd 6mo.Libor plus 3.03Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2022 750.0 USD [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 1,554.0 EUR [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 1364.8 EUR 3.44% [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] July 2020 750.0 EUR [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 - January 2021 750.0 EUR [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 to December 2016 500Euro 4.32Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] July 2014 337Euro 3.94Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 - January 2023 290.0 EUR [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] December 2015 263.3Euro 3.97Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2023 210.0 EUR [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 to January 2018 175Euro 3.74Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 to July 2020 171.3Euro 3.95Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] July 2020 171.3Euro 4.32Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] December 2014 107.0 EUR 4.73 Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 - November 2021 107.0 EUR 2.89 Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 2380.0 CHF 2.81% [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 - January 2022 711.5 CHF [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 — January 2021 500.0 CHF 1.65% [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 - January 2018 400.0 CHF [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 to December 2016 370.9Chf 3.82Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] January 2015 to November 2019 226.8 CHF 6.88 Percent [Member] UPC Broadband Holding [Member]	Mar. 31, 2014 Due To Counterparty [Member] July 2017 to July 2019 600.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] August 2015 350Euro 3.54Percent [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] August 2015 to December 2018 350.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] December 2015 to June 2021 EUR250.0 3.49% [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] July 2019 200.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] July 2017 150.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] July 2017 to December 2018 70.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] June 2021 55.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] June 2015 50Euro 3.55Percent [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] December 2017 50Euro 3.52Percent [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] December 2015 to July 2019 50.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] December 2017 to July 2019 50.0 EUR [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] July 2017 to June 2021 EUR 50 3.00% [Member] Telenet International [Member]	Mar. 31, 2014 Due To Counterparty [Member] August 2015 to June 2021 EUR 45.0 3.20% [Member] Telenet International [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	€ 1,364.8	€ 750.0	€ 750.0	€ 500.0	€ 337.0	€ 290.0	€ 263.3	€ 210.0	€ 175.0	€ 171.3	€ 171.3	€ 107.0	€ 107.0	2,380.0	711.5	500.0	400.0	370.9	226.8	€ 600.0	€ 350.0	€ 305.0	€ 250.0	€ 200.0	€ 150.0	€ 70.0	€ 55.0	€ 50.0	€ 50.0	€ 50.0	€ 50.0	€ 50.0	€ 45.0
Derivative Interest Rate																																											5.50%				6.63%	6.88%			6.38%																																1.52%		3.87%	2.86%	1.37%				3.44%		2.57%	4.32%	3.94%	2.79%	3.97%	2.88%	3.74%	3.95%	4.32%	4.73%	2.89%	2.81%	1.89%	1.65%	2.51%	3.82%	6.88%	3.29%	3.54%	2.46%	3.49%	3.55%	3.55%	3.00%	2.29%	3.55%	3.52%	3.40%	2.99%	3.00%	3.20%
Derivative Interest Rate Referenced																																										6 mo. GBP LIBOR		6 mo. GBP LIBOR	6 mo. GBP LIBOR	6 mo. GBP LIBOR			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. 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	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR	3 mo. EURIBOR		6 mo. GBP LIBOR				6 mo. LIBOR	6 mo. LIBOR	6 mo. EURIBOR		6 mo. EURIBOR
Derivative Interest Rate Above Referenced Rate																																												1.84%					3.75%																			5.01%																1.84%				3.03%	4.89%	3.56%		3.16%