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Basis of Presentation (Narrative) (Details) (USD $)
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0 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 2 Months Ended | 0 Months Ended | 0 Months Ended | ||||||||||
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Oct. 09, 2013
tranche
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Sep. 30, 2013
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Apr. 25, 2014
SIRIUS XM
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Nov. 14, 2013
SIRIUS XM
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Oct. 09, 2013
SIRIUS XM
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Jan. 18, 2013
SIRIUS XM
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May 31, 2014
SIRIUS XM
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Mar. 31, 2013
SIRIUS XM
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Sep. 30, 2014
SIRIUS XM
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Oct. 09, 2013
SIRIUS XM
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Jan. 18, 2013
SIRIUS XM
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Sep. 30, 2014
Liberty Interactive Corp., Starz, LLC and TripCo [Member]
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Sep. 30, 2013
Liberty Interactive Corp., Starz, LLC and TripCo [Member]
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Sep. 30, 2014
Liberty Interactive Corp., Starz, LLC and TripCo [Member]
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Sep. 30, 2013
Liberty Interactive Corp., Starz, LLC and TripCo [Member]
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Sep. 30, 2014
Starz, LLC [Member]
Lease Agreements
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Oct. 31, 2014
Liberty Broadband
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Sep. 30, 2014
Liberty Broadband
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Oct. 31, 2014
SIRIUS XM
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Aug. 31, 2014
SIRIUS XM
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Sep. 30, 2014
SIRIUS XM
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Jul. 23, 2014
Common Class A
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Jul. 23, 2014
Common Class A
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Jul. 23, 2014
Common Class C
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| Entity Information [Line Items] | ||||||||||||||||||||||||
| Number of shares issued during the period for each share of Series A and Series B stock held by shareholders prior to the distribution | 2 | 2 | ||||||||||||||||||||||
| Related Party Transaction, Amounts of Transaction | $ 4,000,000 | $ 6,000,000 | $ 12,000,000 | $ 15,000,000 | $ 3,000,000 | |||||||||||||||||||
| Purchase of shares in equity method investee | 50,000,000 | |||||||||||||||||||||||
| Convertible Preferred Stock, Shares Issued upon Conversion | 1,293,509,076 | |||||||||||||||||||||||
| Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions | 50.00% | |||||||||||||||||||||||
| Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain | 7,500,000,000 | |||||||||||||||||||||||
| Stock Repurchased and Retired During Period, Shares | 43,712,265 | 136,600,826 | 19,431,708 | 39,346,125 | 51,884,795 | |||||||||||||||||||
| Payments for Repurchase of Common Stock | 140,000,000 | 500,000,000 | 600,000,000 | 250,000,000 | ||||||||||||||||||||
| Share Repurchase Payment Adjustment | 94,000,000 | |||||||||||||||||||||||
| Number of share repurchase tranches | 3 | |||||||||||||||||||||||
| Share Price | $ 3.6603 | |||||||||||||||||||||||
| Stock Repurchased and Retired During Period, Value | 340,000,000 | |||||||||||||||||||||||
| Stock Repurchase Program, Authorized Amount | 600,000,000 | 250,000,000 | ||||||||||||||||||||||
| Stock Repurchased During Period, Shares | 112,500,000 | |||||||||||||||||||||||
| Stock Repurchase Program, Remaining Authorized Repurchase Amount | 68,000,000 | |||||||||||||||||||||||
| Class of Warrant or Right, Outstanding | 15,776,000 | |||||||||||||||||||||||
| Class of Warrant or Right, Exercise Price of Warrants or Rights | 87.35 | |||||||||||||||||||||||
| Share repurchases, discount from market price | 1.50% | |||||||||||||||||||||||
| Volume weighted average price period | 10 days | 20 days | ||||||||||||||||||||||
| Volume weighted average share price, cap | $ 4.18 | |||||||||||||||||||||||
| Volume weighted average share price, floor | $ 3.64 | |||||||||||||||||||||||
| Stock repurchased as a percentage of shares outstanding | 2.00% | |||||||||||||||||||||||
| Number of shares received in spin-off | 0.25 | |||||||||||||||||||||||
| Common Stock, Shares Subscribed but Unissued | 1 | |||||||||||||||||||||||
| Subscription right basis | 5 | |||||||||||||||||||||||
| Subscription right discount | 20.00% | |||||||||||||||||||||||
| Funds borrowed and remitted to parent | $ 300,000,000 | |||||||||||||||||||||||