Debt and Capital Lease Obligations (Ziggo Notes) (Details) $ in Millions	Dec. 31, 2014 EUR (€)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
Principal amount outstanding		$ 44,612.2
Debt Instrument, Fair Value Disclosure		46,151.1	$ 44,229.0
Long-term Debt		44,611.4	42,856.0
Ziggo Notes [Member]
Debt Instrument [Line Items]
Principal amount outstanding		986.0
Debt Instrument, Fair Value Disclosure		1,082.3	0.0
Long-term Debt		$ 1,077.0	$ 0.0
Ziggo 2020 Euro Senior Secured Notes [Member]
Debt Instrument [Line Items]
Stated interest rate of debt	3.625%	3.625%
Principal amount outstanding	€ 71,700,000.0	$ 86.8
Debt Instrument, Fair Value Disclosure		88.7
Long-term Debt		$ 89.3
Additional basis points used to determine redemption premium	0.50%	0.50%
Ziggo 2024 Euro Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate of debt	7.125%	7.125%
Principal amount outstanding	€ 743,100,000.0	$ 899.2
Debt Instrument, Fair Value Disclosure		993.6
Long-term Debt		$ 987.7
2019	103.563%	103.563%
2020	102.375%	102.375%
2021	101.188%	101.188%
2022 and thereafter	100.00%	100.00%
Mandatory redemption percentage in event that certain assets sold or specific control changed	101.00%	101.00%

Additional basis points on discount rate used to calculate redemption premium on debt instrument.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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