Annual report pursuant to Section 13 and 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 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
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     $ 290 $ 339  
Indemnification asset     345 202  
Debt     1,750 1,557  
Recurring | Level 1          
Assets and liabilities measured at fair value          
Cash equivalents     290 339  
Recurring | Level 2          
Assets and liabilities measured at fair value          
Indemnification asset     345 202  
Debt     $ 1,750 $ 1,557  
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        
GCI Liberty | 1.75% Exchangeable Senior Debentures due 2046          
Assets and liabilities measured at fair value          
Indemnification payment from GCI Liberty, Inc. $ 133