Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	15,000,000	27,000,000
Net income attributable to Charter shareholders	$ 807	$ 396
Charter Holdings convertible preferred units	38	0
Net income attributable to Charter shareholders after assumed conversions	$ 845	$ 396
Weighted average common shares outstanding, basic (shares)	191,404,527	207,831,305
Assumed exercise or issuance of shares relating to stock plans	5,134,509	4,979,308
Weighted average Charter Holdings convertible preferred units	9,333,500	0
Weighted average common shares outstanding, diluted (shares)	205,872,536	212,810,613
Basic earnings per common share attributable to Charter shareholders (dollars per share)	$ 4.22	$ 1.91
Diluted earnings per common share attributable to Charter shareholders (dollars per share)	$ 4.11	$ 1.86