Recent Accounting Pronouncements - Stock-Based Compensation (Details) - USD ($) $ in Millions |
Sep. 30, 2018 |
Jan. 01, 2018 |
Dec. 31, 2017 |
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | 听 | 听 | 听 |
| Equity | $ 22,369 | 听 | $ 22,574 |
| Retained earnings | 13,684 | $ 13,122 | 13,081 |
| Noncontrolling interests in equity of subsidiaries | $ 5,509 | 5,635 | $ 5,631 |
| New Accounting Pronouncement, Early Adoption | 听 | 听 | 听 |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | 听 | 听 | 听 |
| Retained earnings | 听 | (3) | 听 |
| Noncontrolling interests in equity of subsidiaries | 听 | (1) | 听 |
| SIRIUS XM | New Accounting Pronouncement, Early Adoption | 听 | 听 | 听 |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | 听 | 听 | 听 |
| Retained earnings | 听 | $ (4) | 听 |
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- 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
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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 The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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