Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value - Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details)

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Assets and Liabilities Measured at Fair Value - Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Mar. 09, 2018
Assets and liabilities measured at fair value          
Indemnification asset         $ 281
Indemnification payment from GCI Liberty, Inc.     $ 133    
Recurring          
Assets and liabilities measured at fair value          
Cash equivalents   $ 319   $ 310  
Indemnification asset   137   79  
Debt   1,627   1,334  
Recurring | Quoted prices in active markets for identical assets (Level 1)          
Assets and liabilities measured at fair value          
Cash equivalents   319   310  
Recurring | Significant other observable inputs (Level 2)          
Assets and liabilities measured at fair value          
Indemnification asset   137   79  
Debt   $ 1,627   $ 1,334  
1.75% Exchangeable Senior Debentures due 2046          
Assets and liabilities measured at fair value          
Interest rate (as a percent)   1.75%      
Securities repurchased 417,759        
Amount of securities repurchased $ 457        
Exchangeable debenture securities outstanding   332,241      
1.75% Exchangeable Senior Debentures due 2046 | GCI Liberty          
Assets and liabilities measured at fair value          
Indemnification payment from GCI Liberty, Inc. $ 133