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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 23,000,000 26,000,000 18,000,000 26,000,000
Net income attributable to Charter shareholders $ 1,217 $ 814 $ 3,044 $ 1,976
Charter Holdings convertible preferred units 0 0 70 0
Net income attributable to Charter shareholders after assumed conversions $ 1,217 $ 814 $ 3,114 $ 1,976
Weighted average common shares outstanding, basic (shares) 181,925,180 202,826,502 186,380,681 205,468,736
Assumed exercise or issuance of shares relating to stock plans 5,240,891 5,895,627 5,158,105 5,931,045
Weighted average Charter Holdings convertible preferred units 0 0 5,777,881 0
Weighted average common shares outstanding, diluted (shares) 187,166,071 208,722,129 197,316,667 211,399,781
Basic earnings per common share attributable to Charter shareholders (dollars per share) $ 6.69 $ 4.01 $ 16.33 $ 9.62
Diluted earnings per common share attributable to Charter shareholders (dollars per share) $ 6.50 $ 3.90 $ 15.78 $ 9.35