Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions |
3 Months Ended | ||
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Mar. 31, 2019
USD ($)
segment
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Mar. 31, 2018
USD ($)
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Dec. 31, 2018
USD ($)
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| Summary Of Significant Accounting Policies [Abstract] | |||
| Number of reportable segments | segment | 1 | ||
| Customer surcharges | $ 53 | $ 57 | |
| Video franchise fees | $ 11 | $ 12 | |
| Number of operating segments | segment | 1 | ||
| Restricted cash | $ 50 | $ 50 | |
| Expected customer life | 3 years 9 months 18 days | ||
| Funding term | 6 years | ||
| X | ||||||||||
- Definition The amount of Universal Service Fund (USF) (primarily federal USF) surcharges collected from customers. No definition available.
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- Definition Straight Line Basis Funding Term No definition available.
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- Definition The amount of video franchise fees. No definition available.
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- References No definition available.
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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. No definition available.
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available.
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- Definition Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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