Debt (Details) | Oct. 17, 2013USD ($)$ / shares$ / itemshares | Apr. 30, 2013USD ($) | Oct. 31, 2015USD ($) | Oct. 31, 2014USD ($) | May. 31, 2013USD ($) | Dec. 31, 2012USD ($) | Aug. 31, 2008USD ($)$ / shares | Dec. 31, 2013USD ($)$ / shares | Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2015USD ($)item$ / sharesshares | Dec. 31, 2014USD ($)$ / shares$ / itemshares | Dec. 31, 2013USD ($)item | Dec. 31, 2014USD ($)$ / shares$ / itemshares | Jun. 30, 2015USD ($) | Mar. 31, 2015USD ($) | Sep. 30, 2013USD ($) | Aug. 31, 2013USD ($) | May. 01, 2013USD ($) | Aug. 31, 2012USD ($) |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Long-term Debt | | | | | | | | | | | $ 6,896,000,000 | $ 5,852,000,000 | | $ 5,852,000,000 | | | | | | |
Warrant expiration period | | | | | | | | | | | 81 days | | | | | | | | | |
Borrowings of debt | | | | | | | | | | | $ 2,213,000,000 | 2,758,000,000 | $ 5,923,000,000 | | | | | | | |
Proceeds from Issuance of Warrants | | | | | | | | $ 170,000,000 | | | | | 170,000,000 | | | | | | | |
Repayments of Long-term Debt | | | | | | | | | | | 1,196,000,000 | 1,936,000,000 | $ 2,779,000,000 | | | | | | | |
Number of margin loans | item | | | | | | | | | | | | | 3 | | | | | | | |
Sirius XM Senior Secured Revolving Credit Facility | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Long-term Debt | | | | | | | | | | | 340,000,000 | $ 380,000,000 | | $ 380,000,000 | | | | | | |
Line of Credit Facility, Remaining Borrowing Capacity | | | | | | | | | | | $ 1,400,000,000 | | | | | | | | | |
Debt Instrument, Term | | | | | | 5 years | | | | | | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | $ 1,250,000,000 | | | | | | | | | | | | | | |
1.375% Cash Convertible Senior Notes due 2023 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | $ 1,000,000,000 | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | 1.375% | | | | | | | | | |
Debt instrument, face amount per debenture | $ 1,000 | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Threshold Trading Days | item | | | | | | | | | | | 20 | | | | | | | | | |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | | | | | | | | | | | 30 days | | | | | | | | | |
Debt instrument, convertible, threshold percentage of conversion price to stock price trigger | | | | | | | | | | | 130.00% | | | | | | | | | |
Number of business days in measurement period | | | | | | | | | | | 5 days | | | | | | | | | |
Number of consecutive trading days in measurement period. | | | | | | | | | | | 5 days | | | | | | | | | |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | | | | | | | | | | | 98.00% | | | | | | | | | |
Proceeds from (Payments for) Other Financing Activities | | | | | | | | 871,000,000 | | | | | | | | | | | | |
$1 billion margin loan due 2014 | Term loan | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Borrowings of debt | | $ 250,000,000 | | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | LIBOR | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | | | | | | 2.00% | | | | | | | | | | | |
$1 billion margin loan due 2014 | Revolving Credit Facility | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Borrowings of debt | | $ 450,000,000 | | | | | | | | | | | | | | | | | | |
Repayments of Long-term Debt | | | | | | | | $ 200,000,000 | | | | | $ 450,000,000 | | | | | | | |
$1 billion margin loan due 2015 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | LIBOR | | | | | | | | | | | | | | | | |
$1 billion margin loan due 2015 | Term loan | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | | $ 250,000,000 | | | | | | | | | | | | | | | | |
$1 billion margin loan due 2015 | Revolving Credit Facility | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | | $ 750,000,000 | | | | | | | | | | | | | | | | |
Interest rate at year end | | | | | | | | | | | | 1.98% | | 1.98% | | | | | | |
Debt instrument, unused borrowing capacity, fee, percent | | | | 0.75% | | | | | | | | | | | | | | | | |
$1.25 billion margin loan due 2016 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | LIBOR | | | | | | | | | | | | | | | | | |
Interest rate at year end | | | | | | | | | | | 2.07% | | | | | | | | | |
$1.25 billion margin loan due 2016 | Term loan | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | $ 250,000,000 | | | | | | | | | | | | | | | | | |
$1.25 billion margin loan due 2016 | Revolving Credit Facility | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | $ 1,000,000,000 | | | | | | | | | | | | | | | | | |
Debt instrument, unused borrowing capacity, fee, percent | | | 0.75% | | | | | | | | | | | | | | | | | |
Line of Credit Facility, Remaining Borrowing Capacity | | | | | | | | | | | $ 1,000,000,000 | | | | | | | | | |
$670 million margin loan due 2015 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | | | | | | | | | | | | | | | | | $ 670,000,000 | |
Repayments of Long-term Debt | | | | | | | | | | | | $ 670,000,000 | | | | | | | | |
Debt Instrument, Description of Variable Rate Basis | | | | | | | | | | | three-month LIBOR | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | | | | | | | | | | | 3.25% | | | | | | |
Sirius XM 7% Exchangeable Senior Subordinated Notes due 2014 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | | | | | $ 550,000,000 | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | 7.00% | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Ratio | | | | | | | 543.1372 | | | | | | | | | | | | | |
Debt instrument, face amount per debenture | | | | | | | $ 1,000 | | | | | | | | | | | | | |
conversion price for exchangeable debt | $ / shares | | | | | | | $ 1.841 | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Amount | | | | | | | | | | | | $ 502,000,000 | | | | | | | | |
Sirius XM 5.25% Senior Secured Notes due 2022 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | | | | | | | | | | | | | | | | | | $ 400,000,000 |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | 5.25% | | | | | | | | | |
Sirius XM Senior Secured Revolving Credit Facility | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Interest rate at year end | | | | | | | | | | | 2.42% | | | | | | | | | |
Debt instrument, unused borrowing capacity, fee, percent | | | | | | | | | | | 0.30% | | | | | | | | | |
Line of Credit Facility, Maximum Borrowing Capacity | | | | | | | | | | | | | | | $ 1,750,000,000 | | | | | |
Sirius XM Senior Notes due 2020 and 2023 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Borrowings of debt | | | | | $ 989,000,000 | | | | | | | | | | | | | | | |
Sirius XM 4.25% Senior Notes due 2020 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | 4.25% | | | | | | | | | |
Sirius XM 4.25% Senior Notes due 2020 | Senior Notes | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | | | 500,000,000 | | | | | | | | | | | | | | | |
Sirius XM 4.625% Senior Notes due 2023 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | | | $ 500,000,000 | | | | | | | | | | | | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | 4.625% | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | | | | | | | | 4.625% | | | | | | | | | |
Sirius XM 5.75% Senior Notes due 2021 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | | | | | | | | | | | | | | | | $ 600,000,000 | | |
Long-term Debt | | | | | | | | | | | | | | | | | | $ 594,000,000 | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | 5.75% | | | | | | | | | |
Sirius XM 5.875% Senior Notes due 2020 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | | | | | | | | | | | | | | | $ 650,000,000 | | | |
Long-term Debt | | | | | | | | | | | | | | | | | $ 643,000,000 | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | 5.875% | | | | | | | | | |
Sirius XM 5.375% Senior Notes Due 2025 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt face amount | | | | | | | | | | | | | | | | $ 1,000,000,000 | | | | |
Debt discount | | | | | | | | | | | | | | | | $ 11,000,000 | | | | |
Debt Instrument, Interest Rate, Stated Percentage | | | | | | | | | | | 5.375% | | | | | | | | | |
Common Class A | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Investment Warrants, Exercise Price | $ / shares | | | | | | | | $ 255.64 | | | | | | | | | | | | |
Common Class A | 1.375% Cash Convertible Senior Notes due 2023 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Ratio | 5.5882 | | | | | | | | | | | | | | | | | | | |
conversion price for exchangeable debt | $ / shares | $ 178.95 | | | | | | | | | | | | | | | | | | | |
Minimum | $1 billion margin loan due 2015 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | 1.75% | | | | | | | | | | | | | | | | |
Minimum | $1.25 billion margin loan due 2016 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | 1.75% | | | | | | | | | | | | | | | | | |
Maximum | $1 billion margin loan due 2015 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | | 2.50% | | | | | | | | | | | | | | | | |
Maximum | $1.25 billion margin loan due 2016 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Basis Spread on Variable Rate | | | 2.25% | | | | | | | | | | | | | | | | | |
SIRIUS XM | $1.25 billion margin loan due 2016 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Shares released as collateral under loan | | | $ 4,600,000 | | | | | | | | | | | | | | | | | |
Live Nation | $1.25 billion margin loan due 2016 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Shares released as collateral under loan | | | $ 7,800,000 | | | | | | | | | | | | | | | | | |
SIRIUS XM | Sirius XM 7% Exchangeable Senior Subordinated Notes due 2014 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt Conversion of a Consolidated Subsidiary, Shares received upon maturity of exchangeable note | shares | | | | | | | | | | | | 5,974,510 | | 5,974,510 | | | | | | |
SIRIUS XM | Sirius XM 7% Exchangeable Senior Subordinated Notes due 2014 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt Conversion, Converted Instrument, Shares Issued | shares | | | | | | | | | | | | 272,855,859 | | | | | | | | |
Adjustments Due To Issuance Of Series C Common Stock and Liberty Broadband Spin Off | Common Class A | 1.375% Cash Convertible Senior Notes due 2023 | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Debt Instrument, Convertible, Conversion Ratio | | | | | | | | | | | | 21.0859 | | | | | | | | |
Debt instrument, face amount per debenture | | | | | | | | | | | | $ 1,000 | | $ 1,000 | | | | | | |
conversion price for exchangeable debt | $ / shares | | | | | | | | | | | | $ 47.43 | | $ 47.43 | | | | | | |
1.375% Convertible Notes Bond Hedge Transaction | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Derivative, Price Risk Option Strike Price | $ / item | 178.95 | | | | | | | | | | | | | | | | | | | |
Payments for Derivative Instrument, Financing Activities | $ 299,000,000 | | | | | | | | | | | | | | | | | | | |
1.375% Convertible Notes Bond Hedge Transaction | Common Class A | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Forward contract, number of underlying shares | shares | 5,588,200 | | | | | | | | | | | | | | | | | | | |
1.375% Convertible Notes Bond Hedge Transaction | Adjustments Due To Issuance Of Series C Common Stock and Liberty Broadband Spin Off | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Derivative, Price Risk Option Strike Price | $ / item | | | | | | | | | | | | 47.43 | | 47.43 | | | | | | |
1.375% Convertible Notes Bond Hedge Transaction | Adjustments Due To Issuance Of Series C Common Stock and Liberty Broadband Spin Off | Common Class A | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Forward contract, number of underlying shares | shares | | | | | | | | | | | | 21,085,900 | | | | | | | | |
Common Class A | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 255.64 | | | | | | | | | | $ 64.46 | | | | | | | | | |
Class of Warrant or Right, Outstanding | shares | | | | | | | | | | | 21,085,900 | | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 255.64 | | | | | | | | | | $ 64.46 | | | | | | | | | |
Common Class A | Adjustments Due To Issuance Of Series C Common Stock and Liberty Broadband Spin Off | | | | | | | | | | | | | | | | | | | | |
Debt Instrument [Line Items] | | | | | | | | | | | | | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | | | | | | | | | | | | $ 64.46 | | $ 64.46 | | | | | | |
Class of Warrant or Right, Outstanding | shares | | | | | | | | | | | | 21,085,900 | | 21,085,900 | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | | | | | | | | | | | | $ 64.46 | | $ 64.46 | | | | | | |