Goodwill and Intangible Assets - Rollforward (Details) - USD ($) $ in Millions  | 
12 Months Ended | |
|---|---|---|
Dec. 31, 2023  | 
Dec. 31, 2022  | 
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| Goodwill [Roll Forward] | ||
| Balance at the beginning of the period | $ 755 | $ 762 | 
| Dispositions | (7) | |
| Balance at the end of the period | 755 | 755 | 
| GCI Holdings | ||
| Goodwill [Roll Forward] | ||
| Balance at the beginning of the period | 755 | 755 | 
| Dispositions | ||
| Balance at the end of the period | 755 | 755 | 
| Corporate and other. | ||
| Goodwill [Roll Forward] | ||
| Balance at the beginning of the period | 7 | |
| Dispositions | (7) | |
| Balance at the end of the period | ||
| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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| X | ||||||||||
- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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| X | ||||||||||
- Details 
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| X | ||||||||||
- Details 
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