Common Stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Roll Forward of Common Shares:
Exercise of stock options	1,271,000	577,000	1,044,000
Purchase of treasury stock	(17,386,100)	(14,357,707)	(33,868,356)
Purchase of treasury stock, value	$ 6,873	$ 4,399	$ 11,715
Remaining value of Class A common stock shares authorized to be repurchased	$ 1,400
Share buybacks
Roll Forward of Common Shares:
Purchase of treasury stock	(16,697,458)	(14,108,919)	(33,375,878)
Purchase of treasury stock, value	$ 6,734	$ 4,322	$ 11,570
Income tax withholding
Roll Forward of Common Shares:
Purchase of treasury stock	(380,797)	(224,319)	(447,455)
Purchase of treasury stock, value	$ 139	$ 77	$ 145
Exercise cost
Roll Forward of Common Shares:
Purchase of treasury stock	(307,845)	(24,469)	(45,023)
Class A Common Stock
Roll Forward of Common Shares:
Shares outstanding, beginning of period (in shares)	225,353,807	238,506,059	268,897,792
Exchange of Charter Holdings units held by A/N (see Note 11)			1,263,497
Exercise of stock options	1,271,419	576,583	1,044,526
Restricted stock issuances, net of cancellations	8,284	10,223	9,517
Restricted stock unit vesting	728,553	618,649	1,159,083
Purchase of treasury stock	(17,386,100)	(14,357,707)	(33,868,356)
Shares outstanding, end of period (in shares)	209,975,963	225,353,807	238,506,059
Class B Common Stock
Roll Forward of Common Shares:
Shares outstanding, beginning of period (in shares)	1	1	1
Exchange of Charter Holdings units held by A/N (see Note 11)			0
Exercise of stock options	0	0	0
Restricted stock issuances, net of cancellations	0	0	0
Restricted stock unit vesting	0	0	0
Purchase of treasury stock	0	0	0
Shares outstanding, end of period (in shares)	1	1	1