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Stockholders' Equity - Additional Information (Details) (USD $)
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3 Months Ended | ||
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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| Class Of Stock [Line Items] | |||
| Common stock, par value (in dollars per share) | $ 0.001us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001us-gaap_CommonStockParOrStatedValuePerShare | |
| Common stock, shares authorized (in shares) | 9,000,000,000us-gaap_CommonStockSharesAuthorized | 9,000,000,000us-gaap_CommonStockSharesAuthorized | |
| Common stock, shares issued (in shares) | 5,513,664,000us-gaap_CommonStockSharesIssued | 5,653,529,000us-gaap_CommonStockSharesIssued | |
| Common stock, shares outstanding (in shares) | 5,507,239,000us-gaap_CommonStockSharesOutstanding | 5,646,119,000us-gaap_CommonStockSharesOutstanding | |
| Common stock reserved for issuance | 277,487,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance | ||
| Number of shares repurchased | 1,402,992,000siri_StockRepurchaseProgramNumberOfSharesRepurchased | ||
| Aggregate cost for shares repurchased | $ 4,819,232,000siri_ShareRepurchaseProgramSharesRepurchasedCost | ||
| Remaining amount authorized under the stock repurchase program | 1,180,768,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 | ||
| Treasury stock | 24,858,000us-gaap_TreasuryStockValue | 26,034,000us-gaap_TreasuryStockValue | |
| Preferred stock, par value (in dollars per share) | $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare | |
| Undesignated preferred stock, shares authorized | 50,000,000us-gaap_PreferredStockSharesAuthorized | 50,000,000us-gaap_PreferredStockSharesAuthorized | |
| Preferred stock liquidation preference per share | $ 0.001us-gaap_PreferredStockLiquidationPreference | $ 0.001us-gaap_PreferredStockLiquidationPreference | |
| Preferred stock, shares issued | 0us-gaap_PreferredStockSharesIssued | 0us-gaap_PreferredStockSharesIssued | |
| Preferred stock, shares outstanding | 0us-gaap_PreferredStockSharesOutstanding | 0us-gaap_PreferredStockSharesOutstanding | |
| Number of warrants exercised (in shares) | 16,667,000us-gaap_ClassOfWarrantOrRightOutstanding | 16,667,000us-gaap_ClassOfWarrantOrRightOutstanding | |
| Exercise price of outstanding warrants | $ 2.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 2.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | |
| Warrants extended expiration period | 60 days | ||
| Warrant expenses | 0siri_ClassOfWarrantorRightExpenseRecognized | ||
| Common Stock [Member] | December 2012 Share Repurchase Program [Member] | |||
| Class Of Stock [Line Items] | |||
| Stock repurchase program, authorized amount |
$ 6,000,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = siri_December2012ShareRepurchaseProgramMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
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- Definition
Class of warrant or right, expense recognized. No definition available.
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- Definition
Share repurchase program, shares repurchased cost. No definition available.
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- Definition
Stock repurchase program, number of shares repurchased. No definition available.
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- Definition
Warrants extended expiration period. No definition available.
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- Details
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- Definition
Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Aggregate number of common shares reserved for future issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Face amount or stated value per share of common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of stock repurchase plan authorized. No definition available.
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- Definition
Amount remaining of a stock repurchase plan authorized. No definition available.
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- Definition
The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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