| Earnings Attributable to Liberty Broadband Stockholders per Common Share (Tables) | 3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Mar. 31, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Earnings Attributable to Liberty Broadband Stockholders per Common Share | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of weighted average number of shares |  
 (1) Potentially dilutive shares are excluded from the computation of diluted EPS during periods in which losses are reported since the result would be antidilutive. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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