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Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 18, 2021
Noncontrolling Interests:
Net income attributable to noncontrolling interest	$ 190			$ 118			$ 442	$ 299
Purchase of noncontrolling interest, net of tax	(345)	$ (492)	$ (429)	(317)	$ (111)	$ (344)
Change in noncontrolling interest ownership, net of tax	(71)	(330)	(44)	(39)	(11)	(27)
Preferred Noncontrolling Interest, Carrying Amount									$ 3,200
Noncontrolling Interest, Carrying Amount									$ 2,000
Noncontrolling Interest, Change in Redemption Value							1,200
Common Noncontrolling Interest
Noncontrolling Interests:
Net income attributable to noncontrolling interest	$ 190			$ 81			$ 371	$ 186
Purchase of noncontrolling interest (shares)	565,972			644,806			2,270,660	1,720,482
Purchase of noncontrolling interest (price per share)	$ 724.50			$ 568.19			$ 660.52	$ 514.10
Purchase price of noncontrolling interest	$ 410			$ 366			$ 1,500	$ 884
Common Noncontrolling Interest | A/N
Noncontrolling Interests:
Shares held by noncontrolling shareholders (shares)									9,300,000
Ownership percentage held by noncontrolling interest (percentage)	7.00%			8.00%			7.00%	8.00%
Preferred Noncontrolling Interest
Noncontrolling Interests:
Number of shares to be received upon conversion to Charter Class A common stock (in shares)									0.37334
Convertible units, conversion price (dollars per unit)									$ 267.85
Net income attributable to noncontrolling interest				$ 37			$ 70	$ 112
Deferred Tax and Other Liabilities, Noncurrent									$ 300
Preferred Noncontrolling Interest | A/N
Noncontrolling Interests:
Shares held by noncontrolling shareholders (shares)									25,000,000
Noncontrolling Interests
Noncontrolling Interests:
Purchase of noncontrolling interest, net of tax	$ (148)	(213)	(192)	(163)	(69)	(195)
Change in noncontrolling interest ownership, net of tax	(290)	(1,333)	(175)	(157)	(52)	(109)
Noncontrolling Interests | Common Noncontrolling Interest
Noncontrolling Interests:
Purchase of noncontrolling interest, net of tax	(148)			(163)			(553)	(427)
Change in noncontrolling interest ownership, net of tax	(290)			(157)			(1,798)	(318)
Additional Paid-in Capital
Noncontrolling Interests:
Purchase of noncontrolling interest, net of tax	(197)	(279)	(237)	(154)	(42)	(149)
Change in noncontrolling interest ownership, net of tax	219	$ 1,003	$ 131	118	$ 41	$ 82
Additional Paid-in Capital | Common Noncontrolling Interest
Noncontrolling Interests:
Impact of noncontrolling interest purchased	(197)			(154)			(713)	(345)
Change in noncontrolling interest ownership, net of tax	$ 219			$ 118			$ 1,353	$ 241
Maximum | Charter
Noncontrolling Interests:
Minority Interest Ownership Percentage Threshold	100.00%						100.00%

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