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, shares in Thousands, $ in Millions
 1 Months Ended
May 18, 2016
Nov. 30, 2014
May 31, 2014
May 31, 2013
Sep. 30, 2017
Dec. 31, 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            
Number of shares of common shares acquired 22,000          
Share Price $ 195.70          
Cash paid to acquire equity method investments $ 4,300.0          
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity         $ 2,100.0  
Cash paid to exercise warrants   $ 52.0        
Common stock par value $ 0.001          
Business Acquisition, Percentage of Voting Interests Acquired 25.01%          
Liberty | Charter            
Investments in affiliates accounted for using the Equity Method            
Number of shares of common shares acquired     897 26,900    
Number of warrants acquired       1,100    
Purchase price of equity method investments     $ 124.5 $ 2,600.0    
Beneficial ownership percentage       27.00%    
Share Price       $ 95.50    
Cash paid to acquire equity method investments       $ 1,200.0    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity       $ 2,532.0    
A/N            
Investments in affiliates accounted for using the Equity Method            
Maximum percentage of New Charter shares that may be voted by proxy 7.00%          
A/N | Charter            
Investments in affiliates accounted for using the Equity Method            
Proxy voting period 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            
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%          
Bright House Transaction | Charter            
Investments in affiliates accounted for using the Equity Method            
Number of shares of common shares acquired 3,700          
Purchase price of equity method investments $ 700.0          
Share Price $ 191.33          
Time Warner Cable Exchange | Charter            
Investments in affiliates accounted for using the Equity Method            
Number of shares of common shares acquired 2,400          
Fair value of shares acquired $ 531.9          
Share exchange ratio 1          
Time Warner Cable Exchange | Liberty Interactive | Charter            
Investments in affiliates accounted for using the Equity Method            
Share exchange ratio 1          
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