Derivative Instruments (Cross-currency Swaps) (Schedule) (Details) (Cross-currency and interest rate derivative contracts) 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		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							6 Months Ended
	Jun. 30, 2014 Due From Counterparty [Member] February 2022 1400.0 USD 873.6 GBP [Member] Virgin Media Investment Holdings Limited [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] June 2020 1384.6 USD 901.4 GBP [Member] Virgin Media Investment Holdings Limited [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] October 2020 1370.4 USD 881.6 GBP [Member] Virgin Media Investment Holdings Limited [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2021 500.0 USD 308.9 GBP [Member] Virgin Media Investment Holdings Limited [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] October 2019 500.0 USD 302.3 GBP [Member] Virgin Media Investment Holdings Limited [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2022 425.0 USD 255.8 GBP [Member] Virgin Media Investment Holdings Limited [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] April 2019 291.5 USD 186.2 GBP [Member} Virgin Media Investment Holdings Limited [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] November 2016 55.0 USD 27.7 GBP [Member] Virgin Media Investment Holdings Limited [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] July 2018 525.0 USD 396.3 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] September 2014 440.0 USD 316.3 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] December 2014 340.0 USD 244.6 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] September 2014 to January 2020 327.5 USD 249.5 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 - July 2021 312.0 USD 240.0 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 300.0 USD 226.5 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] October 2020 300.0 USD 219.1 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2017 - July 2021 262.1 USD 194.1 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] November 2019 250.0 USD 181.5 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] November 2021 250.0 USD 181.4 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] December 2014 to July 2018 200.0 USD 151.0 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2020 197.5 USD 150.5 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] September 2014 - July 2021 128.0 USD 97.2 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 - July 2018 100.0 USD 75.4 EUR [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] December 2016 340.0 USD [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2017 - July 2021 300.0 USD 278.3 CHF [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] November 2019 250Usd 226.8Chf [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2020 225.0 USD 206.3 CHF [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 - July 2021 200.0 USD 186.0 CHF [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 171.5 USD [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] December 2014 340Usd 181322Clp [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] December 2016 201.5 USD 489.3 RON [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 898.4 EUR 1466.0 CHF [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 - September 2022 383.8 EUR 477.0 CHF [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 - January 2017 360.4 EUR 589.0 CHF [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] April 2018 285.1 EUR 346.7 CHF [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] January 2020 175Euro 258.6Chf [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] July 2020 107.4 EUR 129.0 CHF [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] January 2017 75.0 EUR 110.9 CHF [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] December 2014 134.2 USD 107800.0 CLP [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] December 2015 69.1 EUR 53,000.0 CLP [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 365.8 EUR 10521.8 CZK [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 to January 2017 60.0 EUR 1703.1 CZK [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] July 2017 39.6 EUR 1,000.0 CZK [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 260.0 EUR 75570.0 HUF [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 to January 2017 260.0 EUR 75570.0 HUF [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] December 2016 150Euro 43367.5Huf [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] July 2018 78Euro 19500Huf [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 400.5 EUR 1605.6 PLN [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] January 2015 - January 2017 245.0 EUR 1000.6 PLN [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] September 2016 200.0 EUR 892.7 PLN [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] July 2017 82Euro 318Pln [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due From Counterparty [Member] December 2014 181,322.0 CLP 340.0 USD [Member] UPC Broadband Holding [Member] CLP	Jun. 30, 2014 Due From Counterparty [Member] December 2014 107,800.0 CLP 134.2 EUR [Member] [Member] UPC Broadband Holding [Member] CLP	Jun. 30, 2014 Due From Counterparty [Member] December 2015 53,000.0 CLP 69.1 EUR [Member] UPC Broadband Holding [Member] CLP	Jun. 30, 2014 Due From Counterparty [Member] January 2021 1000.0 USD 688.2 EUR [Member] Unitymedia Hessen [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] March 2019 459.3 USD 326.5 EUR [Member] Unitymedia Hessen [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] January 2022 1,400.0 USD 760,340.0 CLP [Member] VTR GlobalCom [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] September 2014 134.9 USD 74,639.5 CLP [Member] VTR GlobalCom [Member] USD ($)	Jun. 30, 2014 Due From Counterparty [Member] September 2014 74,639.5 CLP 134.9 USD [Member] VTR GlobalCom [Member] CLP	Jun. 30, 2014 Due To Counterparty [Member] February 2022 1400.0 USD 873.6 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Jun. 30, 2014 Due To Counterparty [Member] June 2020 1384.6 USD 901.4 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Jun. 30, 2014 Due To Counterparty [Member] October 2020 1370.4 USD 881.6 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Jun. 30, 2014 Due To Counterparty [Member] January 2021 500.0 USD 308.9 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Jun. 30, 2014 Due To Counterparty [Member] October 2019 500.0 USD 302.3 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Jun. 30, 2014 Due To Counterparty [Member] January 2022 425.0 USD 255.8 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Jun. 30, 2014 Due To Counterparty [Member] April 2019 291.5 USD 186.2 GBP [Member} Virgin Media Investment Holdings Limited [Member] GBP (£)	Jun. 30, 2014 Due To Counterparty [Member] November 2016 55.0 USD 27.7 GBP [Member] Virgin Media Investment Holdings Limited [Member] GBP (£)	Jun. 30, 2014 Due To Counterparty [Member] July 2018 525.0 USD 396.3 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] September 2014 440.0 USD 316.3 EUR [Member] Virgin Media Investment Holdings Limited [Member]	Jun. 30, 2014 Due To Counterparty [Member] September 2014 440.0 USD 316.3 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] December 2014 340.0 USD 244.6 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] September 2014 to January 2020 327.5 USD 249.5 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] January 2015 - July 2021 312.0 USD 240.0 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] January 2015 300.0 USD 226.5 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] October 2020 300.0 USD 219.1 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] January 2017 - July 2021 262.1 USD 194.1 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] November 2019 250.0 USD 181.5 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] November 2021 250.0 USD 181.4 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] December 2014 to July 2018 200.0 USD 151.0 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] January 2020 197.5 USD 150.5 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] September 2014 - July 2021 128.0 USD 97.2 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] January 2015 - July 2018 100.0 USD 75.4 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] December 2016 340.0 USD [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] January 2017 - July 2021 300.0 USD 278.3 CHF [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] November 2019 250Usd 226.8Chf [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] January 2020 225.0 USD 206.3 CHF [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] January 2015 - July 2021 200.0 USD 186.0 CHF [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] January 2015 171.5 USD [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] December 2014 340Usd 181322Clp [Member] UPC Broadband Holding [Member] CLP	Jun. 30, 2014 Due To Counterparty [Member] December 2016 201.5 USD 489.3 RON [Member] UPC Broadband Holding [Member] RON	Jun. 30, 2014 Due To Counterparty [Member] January 2015 898.4 EUR 1466.0 CHF [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] January 2015 - September 2022 383.8 EUR 477.0 CHF [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] January 2015 - January 2017 360.4 EUR 589.0 CHF [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] April 2018 285.1 EUR 346.7 CHF [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] January 2020 175Euro 258.6Chf [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] July 2020 107.4 EUR 129.0 CHF [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] January 2017 75.0 EUR 110.9 CHF [Member] UPC Broadband Holding [Member] CHF	Jun. 30, 2014 Due To Counterparty [Member] December 2014 134.2 USD 107800.0 CLP [Member] UPC Broadband Holding [Member] CLP	Jun. 30, 2014 Due To Counterparty [Member] December 2015 69.1 EUR 53,000.0 CLP [Member] UPC Broadband Holding [Member] CLP	Jun. 30, 2014 Due To Counterparty [Member] January 2015 365.8 EUR 10521.8 CZK [Member] UPC Broadband Holding [Member] CZK	Jun. 30, 2014 Due To Counterparty [Member] January 2015 to January 2017 60.0 EUR 1703.1 CZK [Member] UPC Broadband Holding [Member] CZK	Jun. 30, 2014 Due To Counterparty [Member] July 2017 39.6 EUR 1,000.0 CZK [Member] UPC Broadband Holding [Member] CZK	Jun. 30, 2014 Due To Counterparty [Member] January 2015 260.0 EUR 75570.0 HUF [Member] UPC Broadband Holding [Member] HUF	Jun. 30, 2014 Due To Counterparty [Member] January 2015 to January 2017 260.0 EUR 75570.0 HUF [Member] UPC Broadband Holding [Member] HUF	Jun. 30, 2014 Due To Counterparty [Member] December 2016 150Euro 43367.5Huf [Member] UPC Broadband Holding [Member] HUF	Jun. 30, 2014 Due To Counterparty [Member] July 2018 78Euro 19500Huf [Member] UPC Broadband Holding [Member] HUF	Jun. 30, 2014 Due To Counterparty [Member] January 2015 400.5 EUR 1605.6 PLN [Member] UPC Broadband Holding [Member] PLN	Jun. 30, 2014 Due To Counterparty [Member] January 2015 - January 2017 245.0 EUR 1000.6 PLN [Member] UPC Broadband Holding [Member] PLN	Jun. 30, 2014 Due To Counterparty [Member] September 2016 200.0 EUR 892.7 PLN [Member] UPC Broadband Holding [Member] PLN	Jun. 30, 2014 Due To Counterparty [Member] July 2017 82Euro 318Pln [Member] UPC Broadband Holding [Member] PLN	Jun. 30, 2014 Due To Counterparty [Member] December 2014 181,322.0 CLP 340.0 USD [Member] UPC Broadband Holding [Member] USD ($)	Jun. 30, 2014 Due To Counterparty [Member] December 2014 107,800.0 CLP 134.2 EUR [Member] [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] December 2015 53,000.0 CLP 69.1 EUR [Member] UPC Broadband Holding [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] January 2021 1000.0 USD 688.2 EUR [Member] Unitymedia Hessen [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] March 2019 459.3 USD 326.5 EUR [Member] Unitymedia Hessen [Member] EUR (€)	Jun. 30, 2014 Due To Counterparty [Member] January 2022 1,400.0 USD 760,340.0 CLP [Member] VTR GlobalCom [Member] CLP	Jun. 30, 2014 Due To Counterparty [Member] September 2014 134.9 USD 74,639.5 CLP [Member] VTR GlobalCom [Member] CLP	Jun. 30, 2014 Due To Counterparty [Member] September 2014 74,639.5 CLP 134.9 USD [Member] UPC Broadband Holding [Member]	Jun. 30, 2014 Due To Counterparty [Member] September 2014 74,639.5 CLP 134.9 USD [Member] VTR GlobalCom [Member] USD ($)
Derivative [Line Items]
Notional amount of derivative	$ 1,400.0	$ 1,384.6	$ 1,370.4	$ 500.0	$ 500.0	$ 425.0	$ 291.5	$ 55.0	$ 525.0	$ 440.0	$ 340.0	$ 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	$ 340.0	$ 201.5	€ 898.4	€ 383.8	€ 360.4	€ 285.1	€ 175.0	€ 107.4	€ 75.0	€ 134.2	€ 69.1	€ 365.8	€ 60.0	€ 39.6	€ 260.0	€ 260.0	€ 150.0	€ 78.0	€ 400.5	€ 245.0	€ 200.0	€ 82.0	181,322.0	107,800.0	53,000.0	$ 1,000.0	$ 459.3	$ 1,400.0	$ 134.9	74,639.5	£ 873.6	£ 901.4	£ 881.6	£ 308.9	£ 302.3	£ 255.8	£ 186.2	£ 27.7	€ 396.3		€ 316.3	€ 244.6	€ 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	181,322.0	489.3	1,466.0	477.0	589.0	346.7	258.6	129.0	110.9	107,800.0	53,000.0	10,521.8	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	318.0	$ 340.0	€ 134.2	€ 69.1	€ 688.2	€ 326.5	760,340.0	74,639.5		$ 134.9
Derivative Interest Rate Referenced		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. 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. LIBOR			6 mo. GBP LIBOR	6 mo. GBP LIBOR	6 mo. GBP LIBOR						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. CHF LIBOR	6 mo. CHF LIBOR			6 mo. CHF LIBOR															6 mo. LIBOR	6 mo. EURIBOR						6 mo. LIBOR
Derivative Interest Rate Above Referenced Rate		2.75%	2.75%										2.50%		3.00%	2.50%				4.92%	2.50%		3.50%	2.50%			2.50%	2.75%			1.68%	2.00%	3.75%			3.00%																								3.18%	3.10%	2.06%					1.99%	(0.04%)			4.92%	2.87%	1.75%	3.04%	2.51%			3.00%	4.91%	2.90%	1.75%	4.01%	2.46%	5.01%	4.81%	2.55%	2.95%	1.75%	3.50%	1.94%	2.22%	3.94%			3.28%		2.00%													1.75%	2.00%					3.00%	3.00%
Derivative Interest Rate	5.01%			5.25%	8.38%	5.50%	5.38%	6.50%									7.25%	7.25%							7.25%									10.51%	7.63%		7.63%		3.50%	5.48%	5.50%	3.00%	5.50%	5.50%	5.50%	5.50%	5.50%	5.50%	6.00%	3.00%	8.76%	10.00%	5.75%	5.50%	7.50%	6.88%		11.34%	5.49%				9.07%	5.82%	5.49%	7.03%	6.25%				7.52%		5.78%			7.74%	7.50%	7.31%			5.77%				5.44%			8.76%	14.01%				9.87%	6.76%		6.98%	10.00%	5.75%	5.99%	6.99%	3.75%	9.40%	10.56%	9.20%	9.15%	7.50%	9.03%	8.19%	5.60%			3.50%	5.58%	7.98%	10.94%	11.34%