Annual report pursuant to Section 13 and 15(d)

Acquisition - Pro Forma Revenue and Net Earnings (Details)

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Acquisition - Pro Forma Revenue and Net Earnings (Details) - GCI Liberty Inc - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]    
Revenue $ 968 $ 903
Net earnings (loss) 695 (172)
Net earnings (loss) attributable to Liberty Broadband shareholders $ 695 $ (171)
Basic net earnings (loss) attributable to Series A, Series B and Series C Liberty Broadband shareholders per common share (in dollars per share) $ 3.82 $ (0.86)
Diluted net earnings (loss) attributable to Series A, Series B and Series C Liberty Broadband shareholders per common share (in dollars per share) $ 3.79 $ (0.86)