Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	15,000,000	26,000,000	15,000,000	26,000,000
Net income attributable to Charter shareholders	$ 1,020	$ 766	$ 1,827	$ 1,162
Charter Holdings convertible preferred units	32	0	70	0
Net income attributable to Charter shareholders after assumed conversions	$ 1,052	$ 766	$ 1,897	$ 1,162
Weighted average common shares outstanding, basic (shares)	185,916,505	205,777,438	188,645,356	206,804,371
Assumed exercise or issuance of shares relating to stock plans	5,058,176	5,129,508	5,098,205	5,353,847
Weighted average Charter Holdings convertible preferred units	8,102,709	0	8,714,704	0
Weighted average common shares outstanding, diluted (shares)	199,077,390	210,906,946	202,458,265	212,158,218
Basic earnings per common share attributable to Charter shareholders (dollars per share)	$ 5.48	$ 3.72	$ 9.69	$ 5.62
Diluted earnings per common share attributable to Charter shareholders (dollars per share)	$ 5.29	$ 3.63	$ 9.37	$ 5.48