Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share
Net income attributable to Charter shareholders	$ 139	$ 3,067	$ 294	$ 2,879
Net income attributable to Charter shareholders after assumed conversions	$ 139	$ 3,114	$ 294	$ 2,926
Weighted average common shares outstanding, basic (shares)	263,460,911	183,362,776	266,217,549	142,457,435
Effect of assumed exercise or issuance of shares relating to stock plans on denominator (shares)	3,848,350	2,351,592	4,031,884	1,751,850
Weighted average common shares outstanding, diluted (shares)	267,309,261	205,214,266	270,249,433	153,959,234
Basic earnings per common share attributable to Charter shareholders (dollars per share)	$ 0.53	$ 16.73	$ 1.11	$ 20.21
Diluted earnings per common share attributable to Charter shareholders (dollars per share)	$ 0.52	$ 15.17	$ 1.09	$ 19.00
Common Units [Member]
Earnings Per Share
Effect of Charter Holdings dilutive securities on numerator	$ 0	$ 29	$ 0	$ 29
Effect of Charter Holdings dilutive securities on denominator (shares)	0	14,986,997	0	7,493,498
Convertible Preferred Units [Member]
Earnings Per Share
Effect of Charter Holdings dilutive securities on numerator	$ 0	$ 18	$ 0	$ 18
Effect of Charter Holdings dilutive securities on denominator (shares)	0	4,512,901	0	2,256,451