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Basis of Presentation - GCI Liberty, Inc. (Details) - GCI Liberty
$ in Millions
Mar. 09, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Corporate Cash $ 475
Margin Loan (996)
Deferred Income Tax Liabilities (550)
Other, net (270)
Total assets and liabilities derecognized 4,347
Liberty Broadband  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Investment 3,822
Charter  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Investment $ 1,866