Debt and Capital Lease Obligations (Consolidated Debt and Capital Lease Obligations) (Details) € in Millions, £ in Millions, CLP in Billions	6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2015 GBP (£) shares	Jun. 30, 2015 EUR (€) shares	Jun. 30, 2015 USD ($) shares	Jun. 30, 2015 CLP shares
Debt:
Weighted average interest rate				4.90%	4.90%	4.90%	4.90%
Unused borrowing capacity						$ 3,882,300,000
Estimated fair value			$ 46,151,100,000			45,524,500,000
Carrying value			44,611,400,000			44,624,900,000
Capital lease obligations:
Total capital lease obligations			1,547,600,000			1,429,100,000
Outstanding principal amount						44,623,800,000
Value added tax, vendor financing arrangement	$ 89,200,000	$ 41,600,000
Unitymedia [Member]
Capital lease obligations:
Maximum amount available to be loaned or distributed					€ 64.4	71,800,000
Maximum amount available to be loaned or distributed, compliance requirements met					202.1	225,400,000
Virgin Media [Member]
Capital lease obligations:
Maximum amount available to be loaned or distributed				£ 670.3		1,053,900,000
Ziggo [Member]
Capital lease obligations:
Maximum amount available to be loaned or distributed					225.4	251,400,000
Maximum amount available to be loaned or distributed, compliance requirements met					€ 57.6	$ 64,200,000
VM Notes [Member]
Debt:
Weighted average interest rate				5.62%	5.62%	5.62%	5.62%
Unused borrowing capacity				£ 0.0		$ 0
Estimated fair value			8,461,000,000			11,156,300,000
Carrying value			8,060,700,000			$ 10,978,400,000
VM Credit Facility [Member]
Debt:
Weighted average interest rate				3.82%	3.82%	3.82%	3.82%
Unused borrowing capacity				£ 675.0		$ 1,061,300,000
Estimated fair value			4,734,900,000			3,331,900,000
Carrying value			4,804,000,000			$ 3,330,700,000
Capital lease obligations:
Carrying value			3,330,700,000
Fee on unused portion of credit facility	1.10%
VM Convertible Notes [Member]
Debt:
Weighted average interest rate				6.50%	6.50%	6.50%	6.50%
Unused borrowing capacity				£ 0.0		$ 0
Estimated fair value			178,700,000			185,100,000
Carrying value			56,800,000			$ 56,500,000
Ziggo Credit Facility [Member]
Debt:
Weighted average interest rate				3.60%	3.60%	3.60%	3.60%
Unused borrowing capacity					€ 450.0	$ 501,900,000
Estimated fair value			4,663,000,000			5,534,500,000
Carrying value			4,710,800,000			5,518,700,000
Capital lease obligations:
Carrying value						5,518,700,000
Unused borrowing capacity, compliance requirements met					€ 409.0	456,200,000
VM Convertible Notes Indenture [Member]
Capital lease obligations:
Debt Instrument, Convertible, Cash Portion of Settlement						910.51
Debt Instrument, Convertible, Principal Amount						$ 1,000
Ziggo SPE Notes [Member]
Debt:
Weighted average interest rate				4.46%	4.46%	4.46%	4.46%
Unused borrowing capacity					€ 0.0	$ 0
Estimated fair value			0			1,710,300,000
Carrying value			0			$ 1,738,300,000
Ziggo Notes [Member]
Debt:
Weighted average interest rate				6.82%	6.82%	6.82%	6.82%
Unused borrowing capacity					€ 0.0	$ 0
Estimated fair value			1,082,300,000			1,006,200,000
Carrying value			1,077,000,000			$ 989,000,000
Unitymedia Notes [Member]
Debt:
Weighted average interest rate				5.03%	5.03%	5.03%	5.03%
Unused borrowing capacity					€ 0.0	$ 0
Estimated fair value			7,869,300,000			7,698,700,000
Carrying value			7,400,900,000			$ 7,441,000,000
Unitymedia Revolving Credit Facilities [Member]
Debt:
Weighted average interest rate				0.00%	0.00%	0.00%	0.00%
Unused borrowing capacity					€ 500.0	$ 557,700,000
Estimated fair value			319,400,000			0
Carrying value			338,800,000			0
Capital lease obligations:
Unused borrowing capacity considering limitations					€ 481.9	$ 537,500,000
UPCB SPE Notes Debt [Member]
Debt:
Weighted average interest rate				5.81%	5.81%	5.81%	5.81%
Unused borrowing capacity					€ 0.0	$ 0
Estimated fair value			4,279,000,000			3,171,100,000
Carrying value			4,009,400,000			$ 3,157,500,000
UPC Broadband Holding Bank Facility [Member]
Debt:
Weighted average interest rate				3.25%	3.25%	3.25%	3.25%
Unused borrowing capacity					€ 1,046.2	$ 1,166,900,000
Estimated fair value			3,156,400,000			1,292,100,000
Carrying value			3,179,200,000			1,302,200,000
Capital lease obligations:
Carrying value						1,302,200,000
Unused borrowing capacity considering limitations					381.0	424,900,000
Unused borrowing capacity, compliance requirements met					€ 531.6	$ 592,900,000
UPC Holding Senior Notes [Member]
Debt:
Weighted average interest rate				6.59%	6.59%	6.59%	6.59%
Unused borrowing capacity					€ 0.0	$ 0
Estimated fair value			2,603,600,000			1,674,000,000
Carrying value			2,391,600,000			1,540,600,000
Capital lease obligations:
Outstanding principal amount						$ 1,545,400,000
Telenet SPE Notes [Member]
Debt:
Weighted average interest rate				5.91%	5.91%	5.91%	5.91%
Unused borrowing capacity					€ 0.0	$ 0
Estimated fair value			2,450,400,000			2,233,700,000
Carrying value			2,299,000,000			$ 2,119,100,000
Telenet Credit Facility [Member]
Debt:
Weighted average interest rate				3.41%	3.41%	3.41%	3.41%
Unused borrowing capacity					€ 322.9	$ 360,100,000
Estimated fair value			1,633,400,000			1,510,100,000
Carrying value			1,638,600,000			1,510,500,000
Capital lease obligations:
Carrying value						$ 1,510,500,000
VTR Senior Secured Notes [Member]
Debt:
Weighted average interest rate				6.88%	6.88%	6.88%	6.88%
Unused borrowing capacity					€ 0.0	$ 0
Estimated fair value			1,439,400,000			1,440,300,000
Carrying value			1,400,000,000			$ 1,400,000,000
VTR Credit Facility [Member]
Debt:
Weighted average interest rate				0.00%	0.00%	0.00%	0.00%
Unused borrowing capacity						$ 194,400,000
Estimated fair value			0			0
Carrying value			0			0
VTR Credit Facility [Member] | United States of America, Dollars
Debt:
Unused borrowing capacity						160,000,000
Capital lease obligations:
Fee on unused portion of credit facility	1.10%
VTR Credit Facility [Member] | Chile, Pesos
Debt:
Unused borrowing capacity						$ 34,400,000	CLP 22.0
Capital lease obligations:
Fee on unused portion of credit facility	1.34%
Sumitomo Collar Loan [Member]
Debt:
Weighted average interest rate				1.88%	1.88%	1.88%	1.88%
Unused borrowing capacity					€ 0.0	$ 0
Estimated fair value			818,000,000			797,700,000
Carrying value			787,700,000			$ 774,300,000
ITV Collar Loan [Member]
Debt:
Weighted average interest rate				1.73%	1.73%	1.73%	1.73%
Unused borrowing capacity						$ 0
Estimated fair value			678,200,000			687,000,000
Carrying value			667,000,000			$ 679,000,000
Liberty Puerto Rico Bank Facility [Member]
Debt:
Weighted average interest rate				5.11%	5.11%	5.11%	5.11%
Unused borrowing capacity						$ 40,000,000
Estimated fair value			666,200,000			939,600,000
Carrying value			672,000,000			933,200,000
Liberty Puerto Rico Bank Facility [Member] | Choice Acquisition [Member]
Debt:
Carrying value						261,100,000
Capital lease obligations:
Outstanding principal amount						$ 267,500,000
Vendor Financing [Member]
Debt:
Weighted average interest rate				3.39%	3.39%	3.39%	3.39%
Unused borrowing capacity						$ 0
Estimated fair value			946,400,000			992,900,000
Carrying value			946,400,000			$ 992,900,000
Capital lease obligations:
General term of vendor financing arrangements	1 year
Value added tax, vendor financing arrangement	$ 110,600,000		101,700,000
Other Debt [Member]
Debt:
Weighted average interest rate				9.34%	9.34%	9.34%	9.34%
Unused borrowing capacity						$ 0
Estimated fair value			171,500,000			163,000,000
Carrying value			171,500,000			$ 163,000,000
Aggregate Variable and Fixed Rate Indebtedness [Member]
Debt:
Weighted average interest rate				5.40%	5.40%	5.40%	5.40%
UM Senior Secured Facility [Member]
Capital lease obligations:
Facility amount					€ 420.0	$ 468,400,000
UM Super Senior Secured Revolving Facility [Member]
Capital lease obligations:
Facility amount					€ 80.0	89,200,000
Unitymedia Capital Lease Obligations [Member]
Capital lease obligations:
Total capital lease obligations			810,100,000			734,400,000
Telenet Capital Lease [Member]
Capital lease obligations:
Total capital lease obligations			413,400,000			383,800,000
Virgin Media Capital Lease Obligations [Member]
Capital lease obligations:
Total capital lease obligations			255,300,000			215,600,000
Other Subsidiaries Capital Lease [Member]
Capital lease obligations:
Total capital lease obligations			67,300,000			94,100,000
Liberty Puerto Rico Capital Lease Obligations [Member]
Capital lease obligations:
Total capital lease obligations			1,000,000			800,000
VTR Capital Lease Obligations [Member]
Capital lease obligations:
Total capital lease obligations			500,000			$ 400,000
Liberty Global Group [Member]
Debt:
Weighted average interest rate				4.83%	4.83%	4.83%	4.83%
Unused borrowing capacity						$ 3,647,900,000
Estimated fair value			44,045,500,000			43,144,600,000
Carrying value			42,539,400,000			42,291,700,000
Capital lease obligations:
Total capital lease obligations			1,546,100,000			1,427,900,000
Outstanding principal amount						42,281,300,000
Liberty Global Group [Member] | Unitymedia [Member]
Debt:
Carrying value						7,581,800,000
Capital lease obligations:
Outstanding principal amount						7,581,800,000
Liberty Global Group [Member] | Virgin Media [Member]
Debt:
Carrying value						14,593,000,000
Capital lease obligations:
Outstanding principal amount						$ 14,573,400,000
Liberty Global Group [Member] | Aggregate Variable and Fixed Rate Indebtedness [Member]
Debt:
Weighted average interest rate				5.20%	5.20%	5.20%	5.20%
LiLAC Group [Member]
Debt:
Weighted average interest rate				6.17%	6.17%	6.17%	6.17%
Unused borrowing capacity						$ 234,400,000
Estimated fair value			2,105,600,000			2,379,900,000
Carrying value			2,072,000,000			2,333,200,000
Capital lease obligations:
Total capital lease obligations			$ 1,500,000			1,200,000
Outstanding principal amount						$ 2,342,500,000
LiLAC Group [Member] | Aggregate Variable and Fixed Rate Indebtedness [Member]
Debt:
Weighted average interest rate				8.70%	8.70%	8.70%	8.70%
Class A Old Liberty Global Ordinary Shares [Member] | VM Convertible Notes Indenture [Member]
Capital lease obligations:
Debt Instrument, Convertible, Number of Equity Instruments | shares				13.4339	13.4339	13.4339	13.4339
Class C Old Liberty Global Ordinary Shares [Member] | VM Convertible Notes Indenture [Member]
Capital lease obligations:
Debt Instrument, Convertible, Number of Equity Instruments | shares				33.4963	33.4963	33.4963	33.4963
Class A Ordinary Shares [Member] | VM Convertible Notes Indenture [Member]
Capital lease obligations:
Debt Instrument, Convertible, Number of Equity Instruments | shares				14.0791	14.0791	14.0791	14.0791
Class C Ordinary Shares [Member] | VM Convertible Notes Indenture [Member]
Capital lease obligations:
Debt Instrument, Convertible, Number of Equity Instruments | shares				35.1665	35.1665	35.1665	35.1665