Stock-Based Compensation - Stock-based compensation expenses (Details) - USD ($) $ in Millions  | 
3 Months Ended | |
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Mar. 31, 2021  | 
Mar. 31, 2020  | 
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| Stock-Based Compensation | 听 | 听 | 
| Stock-based compensation | $ 63 | $ 67 | 
| Programming and content | 听 | 听 | 
| Stock-Based Compensation | 听 | 听 | 
| Stock-based compensation | 8 | 8 | 
| Customer service and billing | 听 | 听 | 
| Stock-Based Compensation | 听 | 听 | 
| Stock-based compensation | 1 | 2 | 
| Other | 听 | 听 | 
| Stock-Based Compensation | 听 | 听 | 
| Stock-based compensation | 1 | 1 | 
| Other operating expense | 听 | 听 | 
| Stock-Based Compensation | 听 | 听 | 
| Stock-based compensation | 10 | 11 | 
| Selling, general and administrative | 听 | 听 | 
| Stock-Based Compensation | 听 | 听 | 
| Stock-based compensation | $ 43 | $ 45 | 
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. 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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