Derivative Instruments (Cross-currency Swaps) (Schedule) (Details) (Currency 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			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] Due From Counterparty [Member] February 2022 1400.0 USD 873.6 GBP [Member] USD ($)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] June 2020 1384.6 USD 901.4 GBP [Member] USD ($)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] October 2020 1370.4 USD 881.6 GBP [Member] USD ($)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] January 2021 500.0 USD 308.9 GBP [Member] USD ($)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] October 2022 450.0 USD 272.0 GBP [Member] USD ($)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] January 2022 425.0 USD 255.8 GBP [Member] USD ($)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] April 2019 291.5 USD 186.2 GBP [Member} USD ($)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] November 2016 55.0 USD 27.7 GBP [Member] USD ($)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] October 2019 50.0 USD 30.3 GBP [Member] USD ($)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due From Counterparty [Member] October 2019 - October 2022 50.0 USD 30.7 GBP [Member] USD ($)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] February 2022 1400.0 USD 873.6 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] June 2020 1384.6 USD 901.4 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] October 2020 1370.4 USD 881.6 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] January 2021 500.0 USD 308.9 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] October 2022 450.0 USD 272.0 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] January 2022 425.0 USD 255.8 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] April 2019 291.5 USD 186.2 GBP [Member} GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] November 2016 55.0 USD 27.7 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] October 2019 50.0 USD 30.3 GBP [Member] GBP (£)	Dec. 31, 2014 Virgin Media Investment Holdings Limited [Member] Due To Counterparty [Member] October 2019 - October 2022 50.0 USD 30.7 GBP [Member] GBP (£)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] July 2018 525.0 USD 396.3 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2020 327.5 USD 249.5 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - July 2021 312.0 USD 240.0 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 300.0 USD 226.5 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] October 2020 300.0 USD 219.1 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2017 - July 2021 262.1 USD 194.1 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] November 2019 250.0 USD 181.5 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] November 2021 250.0 USD 181.4 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] July 2018 200.0 USD 151.0 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2020 197.5 USD 150.5 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] July 2021 128.0 USD 97.2 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - July 2018 100.0 USD 75.4 EUR [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] December 2016 340.0 USD [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2017 - July 2021 300.0 USD 278.3 CHF [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] November 2019 250 USD 226.8 CHF [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2020 225.0 USD 206.3 CHF [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - July 2021 200.0 USD 186.0 CHF [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 171.5 USD [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] July 2020 201.5 USD 489.3 RON [Member] USD ($)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 898.4 EUR 1466.0 CHF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - January 2021 720.8 EUR 877.0 CHF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - September 2022 383.8 EUR 477.0 CHF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - January 2017 360.4 EUR 589.0 CHF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] April 2018 285.1 EUR 346.7 CHF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2020 175Euro 258.6Chf [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - July 2021 161.4EUR 187.1 CHF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] July 2020 107.4 EUR 129.0 CHF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2017 75.0 EUR 110.9 CHF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] December 2015 69.1 EUR 53,000.0 CLP [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 365.8 EUR 10521.8 CZK [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - January 2020 318.9 EUR 8818.7 CZK [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 to January 2017 60.0 EUR 1703.1 CZK [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] July 2017 39.6 EUR 1,000.0 CZK [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 260.0 EUR 75570.0 HUF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 to January 2017 260.0 EUR 75570.0 HUF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] December 2016 150 EUR 4,3367.5 HUF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] July 2018 78.0 EUR 19,500 HUF [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 400.5 EUR 1605.6 PLN [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - January 2017 245.0 EUR 1000.6 PLN [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] September 2016 200.0 EUR 892.7 PLN [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2015 - January 2020 144.6 EUR 605.0 PLN [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] July 2017 82Euro 318Pln [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] December 2015 53,000.0 CLP 69.1 EUR [Member] CLP	Dec. 31, 2014 UPC Broadband Holding [Member] Due From Counterparty [Member] January 2022 2,350.0 USD 1,727.0 EUR [Member]	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] July 2018 525.0 USD 396.3 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2020 327.5 USD 249.5 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - July 2021 312.0 USD 240.0 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 300.0 USD 226.5 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] October 2020 300.0 USD 219.1 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2017 - July 2021 262.1 USD 194.1 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] November 2019 250.0 USD 181.5 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] November 2021 250.0 USD 181.4 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] July 2018 200.0 USD 151.0 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2020 197.5 USD 150.5 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] July 2021 128.0 USD 97.2 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - July 2018 100.0 USD 75.4 EUR [Member] EUR (€)	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] December 2016 340.0 USD [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2017 - July 2021 300.0 USD 278.3 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] November 2019 250 USD 226.8 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2020 225.0 USD 206.3 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - July 2021 200.0 USD 186.0 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 171.5 USD [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] July 2020 201.5 USD 489.3 RON [Member] RON	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 898.4 EUR 1466.0 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - January 2021 720.8 EUR 877.0 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - September 2022 383.8 EUR 477.0 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - January 2017 360.4 EUR 589.0 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] April 2018 285.1 EUR 346.7 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2020 175Euro 258.6Chf [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - July 2021 161.4EUR 187.1 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] July 2020 107.4 EUR 129.0 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2017 75.0 EUR 110.9 CHF [Member] CHF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] December 2015 69.1 EUR 53,000.0 CLP [Member] CLP	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 365.8 EUR 10521.8 CZK [Member] CZK	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - January 2020 318.9 EUR 8818.7 CZK [Member] CZK	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 to January 2017 60.0 EUR 1703.1 CZK [Member] CZK	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] July 2017 39.6 EUR 1,000.0 CZK [Member] CZK	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 260.0 EUR 75570.0 HUF [Member] HUF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 to January 2017 260.0 EUR 75570.0 HUF [Member] HUF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] December 2016 150 EUR 4,3367.5 HUF [Member] HUF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] July 2018 78.0 EUR 19,500 HUF [Member] HUF	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 400.5 EUR 1605.6 PLN [Member] PLN	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - January 2017 245.0 EUR 1000.6 PLN [Member] PLN	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] September 2016 200.0 EUR 892.7 PLN [Member] PLN	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] January 2015 - January 2020 144.6 EUR 605.0 PLN [Member] PLN	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] July 2017 82Euro 318Pln [Member] PLN	Dec. 31, 2014 UPC Broadband Holding [Member] Due To Counterparty [Member] December 2015 53,000.0 CLP 69.1 EUR [Member] EUR (€)	Dec. 31, 2014 Unitymedia Hessen [Member] Due From Counterparty [Member] January 2023 1,652.9 USD 1,252.5 EUR [Member] USD ($)	Dec. 31, 2014 Unitymedia Hessen [Member] Due From Counterparty [Member] January 2021 797.1 USD 546.5 EUR [Member] USD ($)	Dec. 31, 2014 Unitymedia Hessen [Member] Due To Counterparty [Member] January 2023 1,652.9 USD 1,252.5 EUR [Member] EUR (€)	Dec. 31, 2014 Unitymedia Hessen [Member] Due To Counterparty [Member] January 2021 797.1 USD 546.5 EUR [Member] EUR (€)	Dec. 31, 2014 Amsterdamse Beheer-en Consultingmaatschappij BV (ABC B.V.), a subsidiary of Ziggo [Member] Due From Counterparty [Member] January 2022 2,350.0 USD 1,727.0 EUR [Member] USD ($)	Dec. 31, 2014 Amsterdamse Beheer-en Consultingmaatschappij BV (ABC B.V.), a subsidiary of Ziggo [Member] Due To Counterparty [Member] January 2022 2,350.0 USD 1,727.0 EUR [Member] EUR (€)	Dec. 31, 2014 VTR GlobalCom [Member] Due From Counterparty [Member] January 2022 1,400.0 USD 760,340.0 CLP [Member] USD ($)	Dec. 31, 2014 VTR GlobalCom [Member] Due To Counterparty [Member] January 2022 1,400.0 USD 760,340.0 CLP [Member] CLP
Derivative [Line Items]
Notional amount of derivative	$ 1,400.0	$ 1,384.6	$ 1,370.4	$ 500.0	$ 450.0	$ 425.0	$ 291.5	$ 55.0	$ 50.0	$ 50.0	£ 873.6	£ 901.4	£ 881.6	£ 308.9	£ 272.0	£ 255.8	£ 186.2	£ 27.7	£ 30.3	£ 30.7	$ 525.0	$ 327.5	$ 312.0	$ 300.0	$ 300.0	$ 262.1	$ 250.0	$ 250.0	$ 200.0	$ 197.5	$ 128.0	$ 100.0	$ 340.0	$ 300.0	$ 250.0	$ 225.0	$ 200.0	$ 171.5	$ 201.5	€ 898.4	€ 720.8	€ 383.8	€ 360.4	€ 285.1	€ 175.0	€ 161.4	€ 107.4	€ 75.0	€ 69.1	€ 365.8	€ 318.9	€ 60.0	€ 39.6	€ 260.0	€ 260.0	€ 150.0	€ 78.0	€ 400.5	€ 245.0	€ 200.0	€ 144.6	€ 82.0	53,000.0		€ 396.3	€ 249.5	€ 240.0	€ 226.5	€ 219.1	€ 194.1	€ 181.5	€ 181.4	€ 151.0	€ 150.5	€ 97.2	€ 75.4	370.9	278.3	226.8	206.3	186.0	187.1	489.3	1,466.0	877.0	477.0	589.0	346.7	258.6	187.1	129.0	110.9	53,000.0	10,521.8	8,818.7	1,703.1	1,000.0	75,570.0	75,570.0	43,367.5	19,500.0	1,605.6	1,000.6	892.7	605.0	318.0	€ 69.1	$ 1,652.9	$ 797.1	€ 1,252.5	€ 546.5	$ 2,350.0	€ 1,727.0	$ 1,400.0	760,340.0
Derivative Interest Rate	5.01%			5.25%	6.00%	5.50%	5.38%	6.50%	8.38%	6.00%	5.49%				6.43%	5.82%	5.49%	7.03%	8.98%	5.75%							7.25%	7.25%							7.25%									10.51%	7.63%			7.63%	3.50%	5.48%	5.58%	5.50%	3.00%	5.50%	5.50%	5.50%	5.50%	5.50%	5.50%	6.00%	5.50%	3.00%	5.75%		6.25%	7.52%		5.78%			7.74%	7.50%	7.31%			5.77%				5.44%			11.34%					9.87%	6.76%			6.98%	5.75%	5.99%	5.44%	6.99%	3.75%	9.40%	10.56%	9.20%	9.15%	7.50%	9.03%	8.19%	7.98%	5.60%	3.50%	5.67%	5.50%	4.50%	5.60%		4.56%	6.88%	10.94%
Derivative Interest Rate Referenced		6 mo. LIBOR	6 mo. LIBOR									6 mo. GBP LIBOR	6 mo. GBP LIBOR	6 mo. GBP LIBOR							6 mo. LIBOR	6 mo. LIBOR	6 mo. LIBOR	6 mo. LIBOR	6 mo. LIBOR	6 mo. LIBOR			6 mo. LIBOR	6 mo. LIBOR	6 mo. LIBOR	6 mo. LIBOR	6 mo. LIBOR	6 mo. LIBOR		6 mo. LIBOR	6 mo. LIBOR	6 mo. LIBOR	6 mo. LIBOR	6 mo. EURIBOR	6 mo. EURIBOR	6 mo. EURIBOR	6 mo. EURIBOR			6 mo. EURIBOR	6 mo. EURIBOR																	6 mo. LIBOR			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. CHF LIBOR	6 mo. CHF LIBOR	6 mo. CHF LIBOR			6 mo. CHF LIBOR	6 mo. CHF LIBOR
Derivative Interest Rate Above Referenced Rate		2.75%	2.75%									3.18%	3.10%	2.06%							1.99%	4.92%	2.50%	1.75%	3.00%	2.50%			3.00%	4.92%	2.50%	1.75%	3.50%	2.50%		4.81%	2.50%	2.75%	3.50%	1.68%	2.50%	2.00%	3.75%			2.35%	3.00%																	2.75%			2.87%		3.04%	2.51%				4.91%	2.90%		4.01%	2.46%	5.01%		2.55%	2.95%		1.94%	2.62%	2.22%	3.94%			2.76%	3.28%