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Long-Term Debt (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 11 Months Ended | 1 Months Ended | 3 Months Ended | ||||||||||||||||||||||||||||||||
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Dec. 31, 2013
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
Sirius XM credit facility [Member]
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Sep. 30, 2013
Starz Bank Facility [Member]
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Dec. 31, 2012
Starz Bank Facility [Member]
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Sep. 30, 2013
$1 billion margin loan due 2014 [Member]
Term loan [Member]
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Dec. 31, 2013
$1 billion margin loan due 2014 [Member]
Revolving Credit Facility [Member]
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Jun. 30, 2013
$1 billion margin loan due 2014 [Member]
Revolving Credit Facility [Member]
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Sep. 30, 2013
$1 billion margin loan due 2014 [Member]
Revolving Credit Facility [Member]
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Jun. 30, 2013
$670 million margin loan due 2015 [Member]
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Jun. 30, 2013
$670 million margin loan due 2015 [Member]
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Sep. 30, 2013
$670 million margin loan due 2015 [Member]
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Jun. 30, 2013
$300 million margin loan due 2014 [Member]
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Sep. 30, 2013
$300 million margin loan due 2014 [Member]
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Sep. 30, 2013
Sirius XM 8.75% Senior Notes due 2015 [Member]
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Jan. 18, 2013
Sirius XM 8.75% Senior Notes due 2015 [Member]
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Sep. 30, 2013
Sirius XM 7% Exchangeable Senior Subordinated Notes due 2014 [Member]
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Jan. 18, 2013
Sirius XM 7% Exchangeable Senior Subordinated Notes due 2014 [Member]
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Sep. 30, 2013
Sirius XM 7.625% Senior Notes due 2018 [Member]
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Oct. 25, 2013
Sirius XM 7.625% Senior Notes due 2018 [Member]
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Sep. 29, 2013
Sirius XM 7.625% Senior Notes due 2018 [Member]
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Jan. 18, 2013
Sirius XM 7.625% Senior Notes due 2018 [Member]
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Sep. 30, 2013
Sirius XM 5.25% Senior Notes due 2022 [Member]
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Sep. 30, 2013
Sirius XM Senior Notes due 2020 [Member]
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Sep. 30, 2013
Sirius XM Senior Notes due 2023 [Member]
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Sep. 30, 2013
Sirius XM Senior Notes due 2020 ans 2023 [Member]
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Sep. 30, 2013
Sirius XM 5.75% Senior Notes due 2021 [Member]
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Sep. 30, 2013
Sirius XM 5.875% Senior Notes due 2020 [Member]
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Dec. 31, 2013
1.375% Cash Convertible Senior Notes due 2023 [Member]
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Oct. 17, 2013
1.375% Cash Convertible Senior Notes due 2023 [Member]
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Dec. 31, 2013
Common Class A [Member]
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Dec. 31, 2013
Common Class A [Member]
1.375% Cash Convertible Senior Notes due 2023 [Member]
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Oct. 17, 2013
Common Class A [Member]
1.375% Cash Convertible Senior Notes due 2023 [Member]
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Mar. 31, 2013
SIRIUS XM [Member]
Sirius XM 7% Exchangeable Senior Subordinated Notes due 2014 [Member]
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Sep. 30, 2012
SIRIUS XM [Member]
Sirius XM 7% Exchangeable Senior Subordinated Notes due 2014 [Member]
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Dec. 31, 2013
SIRIUS XM [Member]
Sirius XM 7% Exchangeable Senior Subordinated Notes due 2014 [Member]
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Sep. 30, 2013
Charter Communications [Member]
$670 million margin loan due 2015 [Member]
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Sep. 30, 2013
SIRIUS XM [Member]
$1 billion margin loan due 2014 [Member]
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Sep. 30, 2013
Live Nation [Member]
$1 billion margin loan due 2014 [Member]
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Sep. 30, 2013
Time Warner Inc [Member]
$1 billion margin loan due 2014 [Member]
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Sep. 30, 2013
Viacom, Inc. [Member]
$1 billion margin loan due 2014 [Member]
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Sep. 30, 2013
Century Link, Inc. [Member]
$1 billion margin loan due 2014 [Member]
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Sep. 30, 2013
Time Warner Cable Inc [Member]
$1 billion margin loan due 2014 [Member]
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Jan. 18, 2013
SIRIUS XM [Member]
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Dec. 31, 2013
1.375% Convertible Notes Bond Hedge Transaction [Member]
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Dec. 31, 2013
1.375% Convertible Notes Bond Hedge Transaction [Member]
Common Class A [Member]
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Oct. 17, 2013
1.375% Convertible Notes Bond Hedge Transaction [Member]
Common Class A [Member]
1.375% Cash Convertible Senior Notes due 2023 [Member]
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| Shares pledged as collateral under loan | 20,300,000 | 719,900,000 | 8,100,000 | 4,400,000 | 3,500,000 | 1,800,000 | 1,100,000 | |||||||||||||||||||||||||||||||||||||||||
| Borrowings of debt | $ 4,211,000,000 | $ 0 | $ 250,000,000 | $ 450,000,000 | $ 300,000,000 | $ 370,000,000 | $ 300,000,000 | $ 594,000,000 | $ 643,000,000 | |||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Face Amount | 4,807,000,000 | 670,000,000 | 1,000,000,000 | |||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Basis Spread on Variable Rate | 2.00% | 3.25% | 5.00% | |||||||||||||||||||||||||||||||||||||||||||||
| Repayments of Long-term Debt | 1,731,000,000 | 750,000,000 | (200,000,000) | (250,000,000) | ||||||||||||||||||||||||||||||||||||||||||||
| Senior Notes, principal amount | 800,000,000 | 550,000,000 | 700,000,000 | 400,000,000 | 500,000,000 | 500,000,000 | 600,000,000 | 650,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 0.35% | 8.75% | 0.00% | 0.00% | 5.25% | 4.25% | 0.00% | 0.00% | 0.00% | 0.00% | ||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Convertible, Conversion Ratio | 5.5882 | 533.3333 | 543.1372 | |||||||||||||||||||||||||||||||||||||||||||||
| Debt Conversion, Converted Instrument, Amount | 48,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Debt Conversion, Converted Instrument, Shares Issued | 28,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Debt instrument, face amount per debenture | 1,000 | 1,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| conversion price for exchangeable debt | $ 178.95 | $ 1.875 | $ 178.95 | |||||||||||||||||||||||||||||||||||||||||||||
| Forward contract, number of underlying shares | 5,588,200 | |||||||||||||||||||||||||||||||||||||||||||||||
| Senior Notes, principal amount owned by Liberty | 150,000,000 | 11,000,000 | 50,000,000 | |||||||||||||||||||||||||||||||||||||||||||||
| Purchase of shares in equity method investee | 50,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Repurchased Face Amount | 800,000,000 | 60,000,000 | 490,000,000 | 160,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
| Debt Instrument, Repurchase Amount | 928,000,000 | 67,000,000 | 561,000,000 | 179,000,000 | ||||||||||||||||||||||||||||||||||||||||||||
| Gains (Losses) on Extinguishment of Debt | 14,000,000 | 2,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Debt Conversion, Converted Instrument, Rate | 581.3112 | |||||||||||||||||||||||||||||||||||||||||||||||
| Line of Credit Facility, Maximum Borrowing Capacity | 1,250,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Line of Credit Facility, Remaining Borrowing Capacity | 1,210,000,000 | 550,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
| Incremental borrowing capacity | 1,000,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Long-term Debt, Fair Value | 656,000,000 | 1,064,000,000 | 544,000,000 | 385,000,000 | 467,000,000 | 456,000,000 | 597,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Senior Notes | 1,000,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Financial Instruments, Owned and Pledged as Collateral, at Fair Value | 2,731,000,000 | 2,793,000,000 | 149,000,000 | 291,000,000 | 295,000,000 | 57,000,000 | 124,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Payments for Derivative Instrument, Investing Activities | 299,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Investment Warrants, Exercise Price | $ 255.64 | |||||||||||||||||||||||||||||||||||||||||||||||
| Proceeds from Issuance of Warrants | 170,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
| Other financing activities, net | $ (19,000,000) | $ 10,000,000 | $ 871,000,000 | |||||||||||||||||||||||||||||||||||||||||||||