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 3 Months Ended
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 09, 2018
Assets and liabilities measured at fair value        
Indemnification asset       $ 281
Recurring        
Assets and liabilities measured at fair value        
Cash equivalents   $ 206 $ 310  
Indemnification asset   110 79  
Debt   1,472 1,334  
Recurring | Quoted prices in active markets for identical assets (Level 1)        
Assets and liabilities measured at fair value        
Cash equivalents   206 310  
Recurring | Significant other observable inputs (Level 2)        
Assets and liabilities measured at fair value        
Indemnification asset   110 79  
Debt   $ 1,472 $ 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