Debt and Capital Lease Obligations (VM Notes) (Details)																																										1 Months Ended			0 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 VM Notes [Member] USD ($)	Dec. 31, 2014 VM Notes [Member] GBP (£)	Dec. 31, 2013 VM Notes [Member] USD ($)	Dec. 31, 2014 VM Senior Notes [Member] USD ($)	Dec. 31, 2014 VM Senior Notes [Member] GBP (£)	Dec. 31, 2014 2022 VM 5.25% Dollar Senior Notes USD ($)	Dec. 31, 2014 2022 VM 4.875% Dollar Senior Notes USD ($)	Dec. 31, 2014 2022 VM Sterling Senior Notes USD ($)	Dec. 31, 2014 2022 VM Sterling Senior Notes GBP (£)	Dec. 31, 2014 2023 VM Dollar Senior Notes USD ($)	Dec. 31, 2014 2023 VM Sterling Senior Notes USD ($)	Dec. 31, 2014 2023 VM Sterling Senior Notes GBP (£)	Dec. 31, 2014 2024 VM Dollar Senior Notes [Member] USD ($)	Oct. 07, 2014 2024 VM Dollar Senior Notes [Member] USD ($)	Dec. 31, 2014 2024 VM Sterling Senior Notes [Member] USD ($)	Dec. 31, 2014 2024 VM Sterling Senior Notes [Member] GBP (£)	Oct. 07, 2014 2024 VM Sterling Senior Notes [Member] USD ($)	Oct. 07, 2014 2024 VM Sterling Senior Notes [Member] GBP (£)	Dec. 31, 2014 January 2021 VM Senior Secured Notes [Member]	Dec. 31, 2014 January 2021 VM Sterling Senior Secured Notes USD ($)	Dec. 31, 2014 January 2021 VM Sterling Senior Secured Notes GBP (£)	Dec. 31, 2014 January 2021 VM Dollar Senior Secured Notes USD ($)	Dec. 31, 2014 April 2021 VM Dollar Senior Secured Notes USD ($)	Dec. 31, 2014 April 2021 VM Sterling Senior Secured Notes USD ($)	Dec. 31, 2014 April 2021 VM Sterling Senior Secured Notes GBP (£)	Dec. 31, 2014 VM Senior Secured Notes, 2025 [Member]	Dec. 31, 2014 VM Sterling Senior Secured Notes, 2025 [Member] USD ($)	Dec. 31, 2014 VM Sterling Senior Secured Notes, 2025 [Member] GBP (£)	Mar. 28, 2014 VM Sterling Senior Secured Notes, 2025 [Member] USD ($)	Mar. 28, 2014 VM Sterling Senior Secured Notes, 2025 [Member] GBP (£)	Dec. 31, 2014 VM Dollar Senior Secured Notes, 2025 [Member] USD ($)	Mar. 28, 2014 VM Dollar Senior Secured Notes, 2025 [Member] USD ($)	Dec. 31, 2014 VM Senior Secured Notes, 2029 [Member]	Apr. 30, 2014 VM Senior Secured Notes, 2029 [Member]	Apr. 30, 2014 Original 2029 VM Senior Secured Notes [Member]	Mar. 28, 2014 Original 2029 VM Senior Secured Notes [Member] USD ($)	Mar. 28, 2014 Original 2029 VM Senior Secured Notes [Member] GBP (£)	Apr. 30, 2014 Additional 2029 VM Senior Secured Notes [Member] USD ($)	Apr. 30, 2014 Additional 2029 VM Senior Secured Notes [Member] GBP (£)	Apr. 30, 2014 2018 VM Dollar Senior Secured Notes USD ($)	Apr. 30, 2014 2018 VM Sterling Senior Secured Notes USD ($)	Apr. 30, 2014 2018 VM Sterling Senior Secured Notes GBP (£)	Oct. 07, 2014 2019 VM Senior Notes [Member] USD ($)	Oct. 07, 2014 2019 VM Dollar Senior Notes USD ($)	Oct. 07, 2014 2019 VM Sterling Senior Notes USD ($)	Oct. 07, 2014 2019 VM Sterling Senior Notes GBP (£)	Dec. 31, 2014 2029 VM Sterling Senior Secured Notes [Member] USD ($)	Dec. 31, 2014 2029 VM Sterling Senior Secured Notes [Member] GBP (£)	Jan. 29, 2015 Long-term Debt [Member] 2025 VM 5.125% Senior Secured Notes [Member] Subsequent Event [Member]	Jan. 28, 2015 Long-term Debt [Member] 2025 VM 5.125% Senior Secured Notes [Member] Subsequent Event [Member]
Debt Instrument [Line Items]
Principal amount of debt						$ 8,028,400,000		$ 95,000,000	$ 118,700,000	$ 68,700,000	£ 44,100,000	$ 530,000,000	$ 389,500,000	£ 250,000,000	$ 500,000,000	$ 500,000,000	$ 467,400,000	£ 300,000,000	$ 467,400,000	£ 300,000,000		$ 979,100,000	£ 628,400,000	$ 447,900,000	$ 1,000,000,000	$ 1,713,900,000	£ 1,100,000,000		$ 670,000,000	£ 430,000,000	$ 670,000,000	£ 430,000,000	$ 425,000,000	$ 425,000,000				$ 350,600,000	£ 225,000,000	$ 272,700,000	£ 175,000,000	$ 1,000,000,000	$ 1,363,400,000	£ 875,000,000					$ 623,200,000	£ 400,000,000
Stated interest rate of debt								5.25%	4.875%	5.125%	5.125%	6.375%	7.00%	7.00%	6.00%	6.00%	6.375%	6.375%	6.375%	6.375%		5.50%	5.50%	5.25%	5.375%	6.00%	6.00%		5.50%	5.50%	5.50%	5.50%	5.50%	5.50%			6.25%	6.25%	6.25%			6.50%	7.00%			8.375%	8.875%	8.875%	6.25%	6.25%
Principal amount of debt redeemed																																														507,100,000	395,000,000	253,500,000
Original issue price, percentage																																				101.75%
Gains (losses) on extinguishment of debt																																										(5,400,000)	5,200,000		32,500,000
Write-off of unamortized debt discount (premium)																																										(33,900,000)	(61,800,000)		(75,200,000)
Payment for debt redemption premium																																										32,400,000	51,300,000		39,300,000
Write off of deferred debt issuance cost																																										6,900,000	5,300,000		3,400,000
Estimated fair value	46,151,100,000	44,229,000,000	8,461,000,000		9,188,700,000	8,461,000,000		90,500,000	113,900,000	69,700,000		555,800,000	425,100,000		525,000,000		504,800,000					1,055,000,000		468,000,000	1,033,100,000	1,810,300,000			694,700,000				440,100,000																675,000,000
Carrying value	44,611,400,000	42,856,000,000	8,060,700,000		9,150,100,000	8,060,700,000		95,800,000	119,600,000	69,300,000		530,000,000	389,500,000		500,000,000		467,400,000					992,200,000		460,100,000	1,000,000,000	1,713,900,000			670,000,000				425,000,000																627,900,000
Debt acceleration covenant threshold for event of default			$ 77,900,000	£ 50,000,000		$ 116,900,000	£ 75,000,000
Additional basis points used to determine redemption premium			0.50%	0.50%																	0.25%
2017																									102.688%	103.00%	103.00%
2018												103.188%	103.50%	103.50%											101.344%	101.50%	101.50%
2019												102.125%	102.333%	102.333%	103.00%		103.188%	103.188%							100.00%	100.00%	100.00%	102.75%
2020												101.063%	101.667%	101.667%	102.00%		102.125%	102.125%							100.00%	100.00%	100.00%	101.833%
2021												100.00%	100.00%	100.00%	101.00%		101.063%	101.063%										100.00%							103.125%
2022												100.00%	100.00%	100.00%	100.00%		100.00%	100.00%										100.00%							102.083%
2023															100.00%		100.00%	100.00%										100.00%							101.042%
2024 and thereafter																												100.00%							100.00%
Mandatory redemption percentage in event that certain assets sold or specific control changed			101.00%	101.00%																																															101.00%	101.00%