CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Total Charter Shareholders’ Equity	Noncontrolling Interests
Balance at Dec. 31, 2019	$ 38,811	$ 0	$ 0	$ 31,405	$ 40	$ 0	$ 31,445	$ 7,366
Rollforward of Consolidated Shareholders' Equity:
Consolidated net income	467	0	0	0	396	0	396	71
Stock compensation expense	90	0	0	90	0	0	90	0
Exercise of stock options	93	0	0	93	0	0	93	0
Issuance of equity	23	0	0	23	0	0	23	0
Purchases of treasury stock	(2,352)	0	0	0	0	(2,352)	(2,352)	0
Purchase of noncontrolling interest, net of tax	(344)	0	0	(149)	0	0	(149)	(195)
Change in noncontrolling interest ownership, net of tax	(27)	0	0	82	0	0	82	(109)
Distributions to noncontrolling interest	(39)	0	0	0	0	0	0	(39)
Balance at Mar. 31, 2020	36,722	0	0	31,544	436	(2,352)	29,628	7,094
Balance at Dec. 31, 2019	38,811	0	0	31,405	40	0	31,445	7,366
Rollforward of Consolidated Shareholders' Equity:
Consolidated net income	1,343
Issuance of equity	23
Purchases of treasury stock	(3,507)
Balance at Jun. 30, 2020	36,401	0	0	31,661	1,202	(3,507)	29,356	7,045
Balance at Mar. 31, 2020	36,722	0	0	31,544	436	(2,352)	29,628	7,094
Rollforward of Consolidated Shareholders' Equity:
Consolidated net income	876	0	0	0	766	0	766	110
Stock compensation expense	90	0	0	90	0	0	90	0
Exercise of stock options	28	0	0	28	0	0	28	0
Purchases of treasury stock	(1,155)	0	0	0	0	(1,155)	(1,155)	0
Purchase of noncontrolling interest, net of tax	(111)	0	0	(42)	0	0	(42)	(69)
Change in noncontrolling interest ownership, net of tax	(11)	0	0	41	0	0	41	(52)
Distributions to noncontrolling interest	(38)	0	0	0	0	0	0	(38)
Balance at Jun. 30, 2020	36,401	0	0	31,661	1,202	(3,507)	29,356	7,045
Balance at Dec. 31, 2020	30,281	0	0	29,000	(5,195)	0	23,805	6,476
Rollforward of Consolidated Shareholders' Equity:
Consolidated net income	921	0	0	0	807	0	807	114
Stock compensation expense	134	0	0	134	0	0	134	0
Exercise of stock options	9	0	0	9	0	0	9	0
Purchases of treasury stock	(3,652)	0	0	0	0	(3,652)	(3,652)	0
Purchase of noncontrolling interest, net of tax	(429)	0	0	(237)	0	0	(237)	(192)
Change in noncontrolling interest ownership, net of tax	(44)	0	0	131	0	0	131	(175)
Distributions to noncontrolling interest	(39)	0	0	0	0	0	0	(39)
Balance at Mar. 31, 2021	27,181	0	0	29,037	(4,388)	(3,652)	20,997	6,184
Balance at Dec. 31, 2020	30,281	0	0	29,000	(5,195)	0	23,805	6,476
Rollforward of Consolidated Shareholders' Equity:
Consolidated net income	2,079
Purchases of treasury stock	(7,168)
Balance at Jun. 30, 2021	24,086	0	0	29,878	(3,368)	(7,168)	19,342	4,744
Balance at Mar. 31, 2021	27,181	0	0	29,037	(4,388)	(3,652)	20,997	6,184
Rollforward of Consolidated Shareholders' Equity:
Consolidated net income	1,158	0	0	0	1,020	0	1,020	138
Stock compensation expense	100	0	0	100	0	0	100	0
Exercise of stock options	17	0	0	17	0	0	17	0
Purchases of treasury stock	(3,516)	0	0	0	0	(3,516)	(3,516)	0
Purchase of noncontrolling interest, net of tax	(492)	0	0	(279)	0	0	(279)	(213)
Change in noncontrolling interest ownership, net of tax	(330)	0	0	1,003	0	0	1,003	(1,333)
Distributions to noncontrolling interest	(32)	0	0	0	0	0	0	(32)
Balance at Jun. 30, 2021	$ 24,086	$ 0	$ 0	$ 29,878	$ (3,368)	$ (7,168)	$ 19,342	$ 4,744