Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Principles (Earnings per Share (EPS)) (Details)

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Summary of Significant Accounting Principles (Earnings per Share (EPS)) (Details) - shares
10 Months Ended 12 Months Ended
Mar. 09, 2018
Dec. 31, 2018
Dec. 31, 2019
Accounting Policies [Abstract]      
Basic WASO (in shares) 109,004,250 107,924,000 105,328,000
Potentially dilutive shares (in shares)   0 489,000
Diluted WASO (in shares)   107,924,000 105,817,000
Antidilutive shares excluded from diluted WASO, including potentially dilutive shares, as a result of the Company's net loss attributable to GCI Liberty, Inc. shareholders (in shares)   1,127,000 0