Earnings Attributable to Liberty Broadband Stockholders Per Common Share (Tables)  | 
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2022  | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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.  | 
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- References No definition available. 
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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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