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Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 18, 2021
Noncontrolling Interests:
Net income attributable to noncontrolling interest	$ 138		$ 110		$ 252	$ 181
Purchase of noncontrolling interest, net of tax	(492)	$ (429)	(111)	$ (344)
Change in noncontrolling interest ownership, net of tax	(330)	(44)	(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	$ 105		$ 72		$ 181	$ 105
Purchase of noncontrolling interest (shares)	912,034		280,069		1,704,688	1,075,676
Purchase of noncontrolling interest (price per share)	$ 639.28		$ 445.15		$ 639.28	$ 481.68
Purchase price of noncontrolling interest	$ 583		$ 125		$ 1,090	$ 518
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	$ 32		$ 37		$ 70	$ 75
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	(213)	(192)	(69)	(195)
Change in noncontrolling interest ownership, net of tax	(1,333)	(175)	(52)	(109)
Noncontrolling Interests | Common Noncontrolling Interest
Noncontrolling Interests:
Purchase of noncontrolling interest, net of tax	(213)		(69)		(405)	(264)
Change in noncontrolling interest ownership, net of tax	(1,333)		(52)		(1,508)	(161)
Additional Paid-in Capital
Noncontrolling Interests:
Purchase of noncontrolling interest, net of tax	(279)	(237)	(42)	(149)
Change in noncontrolling interest ownership, net of tax	1,003	$ 131	41	$ 82
Additional Paid-in Capital | Common Noncontrolling Interest
Noncontrolling Interests:
Impact of noncontrolling interest purchased	(279)		(42)		(516)	(191)
Change in noncontrolling interest ownership, net of tax	$ 1,003		$ 41		$ 1,134	$ 123
Maximum | Charter
Noncontrolling Interests:
Minority Interest Ownership Percentage Threshold	100.00%				100.00%

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