Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 11,761	$ 11,450	$ 11,347	$ 11,206	$ 11,231	$ 10,892	$ 10,854	$ 10,657	$ 45,764	$ 43,634	$ 41,581
Income from operations	1,959	1,586	1,541	1,425	1,439	1,380	1,360	1,042	6,511	5,221	4,106
Net income attributable to Charter shareholders	$ 714	$ 387	$ 314	$ 253	$ 296	$ 493	$ 273	$ 168	$ 1,668	$ 1,230	$ 9,895
Earnings per common share, basic	$ 3.36	$ 1.77	$ 1.41	$ 1.13	$ 1.31	$ 2.14	$ 1.17	$ 0.71	$ 7.60	$ 5.29	$ 38.55
Earnings per common share, diluted	$ 3.28	$ 1.74	$ 1.39	$ 1.11	$ 1.29	$ 2.11	$ 1.15	$ 0.70	$ 7.45	$ 5.22	$ 34.09
Weighted average common shares outstanding, basic (in shares)	212,648,072	218,499,213	222,392,274	224,630,122	227,005,966	230,554,633	234,241,769	237,762,295	219,506,735	232,356,665	256,720,715
Weighted average common shares outstanding, diluted (in shares)	217,778,099	222,355,867	225,942,172	227,595,365	230,131,933	233,607,414	237,073,566	241,420,722	223,786,380	235,525,226	296,703,956