Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share
Antidilutive securities excluded from computation of earnings per share (in shares)									31,000,000
Net income attributable to Charter shareholders	$ 296	$ 493	$ 273	$ 168	$ 9,553	$ 48	$ 139	$ 155	$ 1,230	$ 9,895	$ 3,522
Net income attributable to Charter shareholders after assumed conversions									$ 1,230	$ 10,114	$ 3,744
Weighted average common shares outstanding, basic (in shares)	227,005,966	230,554,633	234,241,769	237,762,295	240,833,636	253,923,805	263,460,911	269,004,817	232,356,665	256,720,715	206,539,100
Effect of assumed exercise or issuance of shares related to stock plans on denominator (in shares)									3,168,561	4,012,145	3,088,871
Weighted average common shares outstanding, diluted (in shares)	230,131,933	233,607,414	237,073,566	241,420,722	278,257,245	258,341,851	267,309,261	273,199,509	235,525,226	296,703,956	234,791,439
Earnings per common share, basic	$ 1.31	$ 2.14	$ 1.17	$ 0.71	$ 39.66	$ 0.19	$ 0.53	$ 0.58	$ 5.29	$ 38.55	$ 17.05
Earnings per common share, diluted	$ 1.29	$ 2.11	$ 1.15	$ 0.70	$ 34.56	$ 0.19	$ 0.52	$ 0.57	$ 5.22	$ 34.09	$ 15.94
Common Units [Member]
Earnings Per Share
Effect of Charter Holdings dilutive securities on numerator									$ 0	$ 69	$ 129
Effect of Charter Holdings dilutive securities on denominator (in shares)									0	26,637,596	19,333,227
Convertible Preferred Units [Member]
Earnings Per Share
Effect of Charter Holdings dilutive securities on numerator									$ 0	$ 150	$ 93
Effect of Charter Holdings dilutive securities on denominator (in shares)									0	9,333,500	5,830,241