Investments In Equity Securities (Details) - USD ($) $ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Marketable Securities [Line Items] | Ìý | Ìý |
| Investments in equity securities | $ 611 | $ 2,363 |
| Charter | Ìý | Ìý |
| Marketable Securities [Line Items] | Ìý | Ìý |
| Investments in equity securities | Ìý | 1,800 |
| ILG | Ìý | Ìý |
| Marketable Securities [Line Items] | Ìý | Ìý |
| Investments in equity securities | 518 | 474 |
| Other Investments | Ìý | Ìý |
| Marketable Securities [Line Items] | Ìý | Ìý |
| Investments in equity securities | $ 93 | $ 89 |
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). No definition available.
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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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