Quarterly report pursuant to Section 13 or 15(d)

Investments in Charter Accounted for Using the Equity Method (Details)

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Investments in Charter Accounted for Using the Equity Method (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
May 18, 2016
Investments in affiliates accounted for using the Equity Method      
Business Acquisition, Percentage of Voting Interests Acquired     25.01%
Charter      
Investments in affiliates accounted for using the Equity Method      
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity $ 3,159 $ 2,975  
A/N | Charter      
Investments in affiliates accounted for using the Equity Method      
Proxy agreement term 5 years    
Trading days before proposed sale of A/N 2 days    
first | A/N | Charter      
Investments in affiliates accounted for using the Equity Method      
Business Acquisition, Percentage of Voting Interests Acquired 25.01%    
Maximum percentage of New Charter shares that may be voted by proxy 7.00%    
last | A/N | Charter      
Investments in affiliates accounted for using the Equity Method      
Maximum percentage of New Charter shares that may be voted by proxy 7.00%    
Series C common stock      
Investments in affiliates accounted for using the Equity Method      
Common stock par value $ 0.01 $ 0.01  
Series A common stock      
Investments in affiliates accounted for using the Equity Method      
Common stock par value $ 0.01 $ 0.01