Derivative Instruments (Interest Rate Swaps) (Schedule) (Details) (Interest Rate Swap [Member]) In Millions, unless otherwise specified																																																																	6 Months Ended				6 Months Ended										6 Months Ended						6 Months Ended																																								6 Months Ended																																6 Months Ended								6 Months Ended								6 Months Ended																																								6 Months Ended
	Jun. 30, 2013 October 2018 2155.0 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)		Jun. 30, 2013 January 2021 650.0 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)		Jun. 30, 2013 December 2015 600.0 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)		Jun. 30, 2013 April 2018 300.0 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)		Jun. 30, 2013 January 2021 300.0 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)		Jun. 30, 2013 July 2020 1000Usd 6mo.Libor plus 3.03Percent [Member] UPC Broadband Holding [Member] USD ($)		Jun. 30, 2013 January 2022 750.0 USD [Member] UPC Broadband Holding [Member] USD ($)		Jun. 30, 2013 January 2014 2750.0 EUR [Member] UPC Broadband Holding [Member] USD ($)		Jun. 30, 2013 December 2014 971.8 EUR [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 July 2020 750.0 EUR [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 January 2015 - January 2021 750.0 EUR [Member] UPC Broadband Holding [Member] USD ($)		Jun. 30, 2013 July 2013 — December 2014 500 EUR 4.67% [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 January 2015 to December 2016 500Euro 4.32Percent [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 July 2014 337Euro 3.94Percent [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 January 2015 - January 2023 290.0 EUR [Member] UPC Broadband Holding [Member] USD ($)		Jun. 30, 2013 December 2015 263.3Euro 3.97Percent [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 January 2023 210.0 EUR [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 January 2014 185Euro 4.04Percent [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 January 2015 to January 2018 175Euro 3.74Percent [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 July 2020 171.3Euro 4.32Percent [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 January 2015 to July 2020 171.3Euro 3.95Percent [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 January 2015 - November 2021 107.0 EUR [Member] UPC Broadband Holding [Member] USD ($)		Jun. 30, 2013 December 2013 90.5 EUR 0.90 Percent [Member] UPC Broadband Holding [Member] EUR (€)		Jun. 30, 2013 December 2014 2380.0 CHF 2.81% [Member] UPC Broadband Holding [Member] USD ($)		Jun. 30, 2013 January 2015 - January 2022 711.5 CHF [Member] UPC Broadband Holding [Member] USD ($)		Jun. 30, 2013 January 2015 — January 2021 500.0 CHF 1.65% [Member] UPC Broadband Holding [Member] USD ($)		Jun. 30, 2013 January 2015 - January 2021 400.0 CHF [Member] UPC Broadband Holding [Member] USD ($)		Jun. 30, 2013 January 2015 to December 2016 370.9Chf 3.82Percent [Member] UPC Broadband Holding [Member] CHF		Jun. 30, 2013 January 2015 to November 2019 226.8 CHF 6.88 Percent [Member] UPC Broadband Holding [Member] CHF		Jun. 30, 2013 July 2013 61,500.0 CLP 6 mo. TAB [Member] UPC Broadband Holding [Member] CLP		Jun. 30, 2013 July 2017 to July 2019 600.0 EUR [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 August 2015 350Euro 3.54Percent [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 August 2015 to December 2018 350.0 EUR [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 December 2015 to June 2021 EUR250.0 3.49% [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 July 2019 200.0 EUR [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 July 2017 150.0 EUR [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 July 2017 to December 2018 70.0 EUR [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 June 2021 55.0 EUR [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 June 2015 50Euro 3.55Percent [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 December 2017 50Euro 3.52Percent [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 December 2015 to July 2019 50.0 EUR [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 December 2017 to July 2019 50.0 EUR [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 July 2017 to June 2021 EUR 50 3.00% [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 August 2015 to June 2021 EUR 45.0 3.20% [Member] Telenet NV [Member] EUR (€)		Jun. 30, 2013 July 2013 61,500.0 CLP [Member] VTR [Member] CLP		Jun. 30, 2013 Due From Counterparty [Member] October 2018 2155.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2021 650.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]		Jun. 30, 2013 Due From Counterparty [Member] December 2015 600.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]		Jun. 30, 2013 Due From Counterparty [Member] April 2018 300.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2021 300.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2020 1000Usd 6mo.Libor plus 3.03Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2022 750.0 USD [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2014 2750.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] December 2014 971.8 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2020 750.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2015 - January 2021 750.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2013 — December 2014 500 EUR 4.67% [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2015 to December 2016 500Euro 4.32Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2014 337Euro 3.94Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2015 - January 2023 290.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] December 2015 263.3Euro 3.97Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2023 210.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2014 185Euro 4.04Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2015 to January 2018 175Euro 3.74Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2020 171.3Euro 4.32Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2015 to July 2020 171.3Euro 3.95Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2015 - November 2021 107.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] December 2013 90.5 EUR 0.90 Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] December 2014 2380.0 CHF 2.81% [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2015 - January 2022 711.5 CHF [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2015 — January 2021 500.0 CHF 1.65% [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2015 - January 2021 400.0 CHF [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2015 to December 2016 370.9Chf 3.82Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] January 2015 to November 2019 226.8 CHF 6.88 Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2013 61,500.0 CLP 6 mo. TAB [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2017 to July 2019 600.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] August 2015 350Euro 3.54Percent [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] August 2015 to December 2018 350.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] December 2015 to June 2021 EUR250.0 3.49% [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2019 200.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2017 150.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2017 to December 2018 70.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] June 2021 55.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] June 2015 50Euro 3.55Percent [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] December 2017 50Euro 3.52Percent [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] December 2015 to July 2019 50.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] December 2017 to July 2019 50.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2017 to June 2021 EUR 50 3.00% [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] August 2015 to June 2021 EUR 45.0 3.20% [Member] Telenet NV [Member]		Jun. 30, 2013 Due From Counterparty [Member] July 2013 61,500.0 CLP [Member] VTR [Member]		Jun. 30, 2013 Due To Counterparty [Member] October 2018 2155.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2021 650.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]		Jun. 30, 2013 Due To Counterparty [Member] December 2015 600.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]		Jun. 30, 2013 Due To Counterparty [Member] April 2018 300.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2021 300.0 GBP [Member] Virgin Media Investment Holdings Limited [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2020 1000Usd 6mo.Libor plus 3.03Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2022 750.0 USD [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2014 2750.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] December 2014 971.8 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2020 750.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2015 - January 2021 750.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2013 — December 2014 500 EUR 4.67% [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2015 to December 2016 500Euro 4.32Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2014 337Euro 3.94Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2015 - January 2023 290.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] December 2015 263.3Euro 3.97Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2023 210.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2014 185Euro 4.04Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2015 to January 2018 175Euro 3.74Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2020 171.3Euro 4.32Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2015 to July 2020 171.3Euro 3.95Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2015 - November 2021 107.0 EUR [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] December 2013 90.5 EUR 0.90 Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] December 2014 2380.0 CHF 2.81% [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2015 - January 2022 711.5 CHF [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2015 — January 2021 500.0 CHF 1.65% [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2015 - January 2021 400.0 CHF [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2015 to December 2016 370.9Chf 3.82Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] January 2015 to November 2019 226.8 CHF 6.88 Percent [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2013 61,500.0 CLP 6 mo. TAB [Member] UPC Broadband Holding [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2017 to July 2019 600.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] August 2015 350Euro 3.54Percent [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] August 2015 to December 2018 350.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] December 2015 to June 2021 EUR250.0 3.49% [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2019 200.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2017 150.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2017 to December 2018 70.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] June 2021 55.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] June 2015 50Euro 3.55Percent [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] December 2017 50Euro 3.52Percent [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] December 2015 to July 2019 50.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] December 2017 to July 2019 50.0 EUR [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2017 to June 2021 EUR 50 3.00% [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] August 2015 to June 2021 EUR 45.0 3.20% [Member] Telenet NV [Member]		Jun. 30, 2013 Due To Counterparty [Member] July 2013 61,500.0 CLP [Member] VTR [Member]
Derivative [Line Items]
Notional amount	£ 2,155.0	[1]	£ 650.0	[1]	£ 600.0	[1]	£ 300.0	[1]	£ 300.0	[1]	$ 1,000.0	[1]	$ 750.0	[1]	$ 2,750.0	[1]	€ 971.8	[1]	€ 750.0	[1]	$ 750.0	[1]	€ 500.0	[1]	€ 500.0	[1]	€ 337.0	[1]	$ 290.0	[1]	€ 263.3	[1]	€ 210.0	[1]	€ 185.0	[1]	€ 175.0	[1]	€ 171.3	[1]	€ 171.3	[1]	$ 107.0	[1]	€ 90.5	[1]	$ 2,380.0	[1]	$ 711.5	[1]	$ 500.0	[1]	$ 400.0	[1]	370.9	[1]	226.8	[1]	61,500.0	[1]	€ 600.0	[1]	€ 350.0	[1]	€ 305.0	[1]	€ 250.0	[1]	€ 200.0	[1]	€ 150.0	[1]	€ 70.0	[1]	€ 55.0	[1]	€ 50.0	[1]	€ 50.0	[1]	€ 50.0	[1]	€ 50.0	[1]	€ 50.0	[1]	€ 45.0	[1]	61,500.0	[1]
Derivative Interest Rate																																																																																													5.50%	[1]							6.63%	[1]	6.88%	[1]					6.38%	[1]																																							6.77%	[1]																															1.52%	[1]			2.86%	[1]	1.37%	[1]	3.89%	[1]							2.97%	[1]			2.57%	[1]	4.67%	[1]	4.32%	[1]	3.94%	[1]	2.79%	[1]	3.97%	[1]	2.88%	[1]	4.03%	[1]	3.74%	[1]	4.32%	[1]	3.95%	[1]	2.89%	[1]	0.90%	[1]	2.81%	[1]	1.89%	[1]	1.65%	[1]	2.51%	[1]	3.82%	[1]	6.88%	[1]			3.29%	[1]	3.54%	[1]	2.46%	[1]	3.49%	[1]	3.55%	[1]	3.55%	[1]	3.00%	[1]	2.29%	[1]	3.55%	[1]	3.52%	[1]	3.40%	[1]	2.99%	[1]	3.00%	[1]	3.20%	[1]	7.78%	[1]
Derivative Interest Rate Referenced																																																																																											6 mo. GBP LIBOR	[1]			6 mo. GBP LIBOR	[1]	6 mo. GBP LIBOR	[1]	6 mo. GBP LIBOR	[1]					1 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]			6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. EURIBOR	[1]	6 mo. CHF LIBOR	[1]	6 mo. CHF LIBOR	[1]	6 mo. CHF LIBOR	[1]	6 mo. CHF LIBOR	[1]	6 mo. CHF LIBOR	[1]	6 mo. CHF LIBOR	[1]			3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	3 mo. EURIBOR	[1]	6 mo. TAB	[1]			6 mo. GBP LIBOR	[1]							6 mo. LIBOR	[1]	6 mo. LIBOR	[1]	6 mo. EURIBOR	[1]			6 mo. EURIBOR	[1]																																							6 mo. TAB	[1]
Derivative Interest Rate Above Referenced Rate																																																																																																			1.83%	[1]					3.76%	[1]																																									5.01%	[1]																																			1.84%	[1]							3.03%	[1]	4.89%	[1]	3.52%	[1]			3.16%	[1]

[1] For each subsidiary, the notional amount of multiple derivative instruments that mature within the same calendar month are shown in the aggregate and interest rates are presented on a weighted average basis. For derivative instruments that were in effect as of June 30, 2013, we present a single date that represents the applicable final maturity date. For derivative instruments that become effective subsequent to June 30, 2013, we present a range of dates that represents the period covered by the applicable derivative instrument.