Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ in Millions |
Dec. 31, 2018 |
Jul. 01, 2018 |
Jan. 01, 2018 |
Dec. 31, 2017 |
|---|---|---|---|---|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | Ìý | Ìý | Ìý | Ìý |
| Additional paid-in capital | $ 2,984 | Ìý | Ìý | $ 3,892 |
| Retained earnings | 13,644 | Ìý | $ 13,122 | 13,081 |
| Noncontrolling interests in equity of subsidiaries | 5,103 | Ìý | 5,635 | 5,631 |
| Accounts Payable and accrued liabilities | $ 1,116 | Ìý | $ 1,283 | $ 1,250 |
| SIRIUS XM | ASU 2018-07 | Early Adoption | Ìý | Ìý | Ìý | Ìý |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | Ìý | Ìý | Ìý | Ìý |
| Additional paid-in capital | Ìý | $ 22 | Ìý | Ìý |
| Retained earnings | Ìý | (3) | Ìý | Ìý |
| Noncontrolling interests in equity of subsidiaries | Ìý | 7 | Ìý | Ìý |
| Accounts Payable and accrued liabilities | Ìý | $ (26) | Ìý | Ìý |
| X | ||||||||||
- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- 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.
|
| X | ||||||||||
- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|