Stockholders' Equity - Common Stock (Details) - $ / shares |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Class of Stock [Line Items] | ||
| Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Common stock, shares authorized (in shares) | 9,000,000,000 | 9,000,000,000 |
| Common stock, shares issued (in shares) | 4,530,928,000 | 4,746,047,000 |
| Common stock, shares outstanding (in shares) | 4,527,742,000 | 4,740,947,000 |
| Common stock reserved for issuance (in shares) | 311,780,000 | |
| Common Stock | ||
| Class of Stock [Line Items] | ||
| Issuance of common stock as part of recapitalization of Sirius XM Canada (in shares) | 35,000,000 | |
| Common Stock | Equity Method Investee | ||
| Class of Stock [Line Items] | ||
| Issuance of common stock as part of recapitalization of Sirius XM Canada (in shares) | 35,000,000 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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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 Number of shares of stock issued during the period as part of a transaction to acquire assets that do not qualify as a business combination. No definition available.
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