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, 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   310 $ 339  
Indemnification asset   79 202  
Debt   1,334 1,557  
Recurring | Level 1        
Assets and liabilities measured at fair value        
Cash equivalents   310 339  
Recurring | Level 2        
Assets and liabilities measured at fair value        
Indemnification asset   79 202  
Debt   $ 1,334 $ 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      
Exchangeable debenture securities outstanding     332,241  
GCI Liberty | 1.75% Exchangeable Senior Debentures due 2046        
Assets and liabilities measured at fair value        
Indemnification payment from GCI Liberty, Inc. $ 133