Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
NET CASH FLOWS FROM OPERATING ACTIVITIES	$ 11,748	$ 11,767	$ 11,954
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(7,195)	(9,125)	(8,681)
Change in accrued expenses related to capital expenditures	55	(470)	820
Real estate investments through variable interest entities	(148)	(21)	(105)
Contribution to subsidiaries	0	0	0
Distributions from subsidiaries	0	0	0
Other, net	(43)	(120)	(132)
Net cash flows from investing activities	(7,331)	(9,736)	(8,098)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	19,685	13,820	25,276
Repayments of long-term debt	(13,309)	(10,769)	(16,507)
Borrowings (repayments) of loans payable - related parties		0	0
Payments for debt issuance costs	(103)	(29)	(111)
Purchase of treasury stock	(6,873)	(4,399)	(11,715)
Proceeds from exercise of stock options	118	69	116
Purchase of noncontrolling interest	(885)	(656)	(1,665)
Distributions to noncontrolling interest	(154)	(153)	(153)
Contributions from parent	0	0	0
Distributions to parent	0	0	0
Borrowings for real estate investments through variable interest entities	0	342	0
Distributions to variable interest entities noncontrolling interest	0	107	0
Other, net	(112)	(5)	(11)
Net cash flows from financing activities	(1,633)	(1,887)	(4,770)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	2,784	144	(914)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	765	621	1,535
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	3,549	765	621
Eliminations
NET CASH FLOWS FROM OPERATING ACTIVITIES	0	0	0
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	67	0	0
Change in accrued expenses related to capital expenditures	0	0	0
Real estate investments through variable interest entities	0	0	0
Contribution to subsidiaries	3,038	353	808
Distributions from subsidiaries	(23,869)	(15,786)	(34,818)
Other, net	(67)	0	0
Net cash flows from investing activities	(20,831)	(15,433)	(34,010)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	0	0	0
Repayments of long-term debt	0	0	0
Borrowings (repayments) of loans payable - related parties		0	0
Payments for debt issuance costs	0	0	0
Purchase of treasury stock	0	0	0
Proceeds from exercise of stock options	0	0	0
Purchase of noncontrolling interest	0	0	0
Distributions to noncontrolling interest	0	0	0
Contributions from parent	(3,038)	(353)	(808)
Distributions to parent	23,869	15,786	34,818
Borrowings for real estate investments through variable interest entities		0
Distributions to variable interest entities noncontrolling interest		0
Other, net	0	0	0
Net cash flows from financing activities	20,831	15,433	34,010
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	0	0	0
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	0	0	0
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	0	0	0
Charter
NET CASH FLOWS FROM OPERATING ACTIVITIES	(36)	(10)	159
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	0	0	0
Change in accrued expenses related to capital expenditures	0	0	0
Real estate investments through variable interest entities	0	0	0
Contribution to subsidiaries	(119)	(69)	(115)
Distributions from subsidiaries	6,910	4,421	11,732
Other, net	0	0	0
Net cash flows from investing activities	6,791	4,352	11,617
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	0	0	0
Repayments of long-term debt	0	0	0
Borrowings (repayments) of loans payable - related parties		(12)	(234)
Payments for debt issuance costs	0	0	0
Purchase of treasury stock	(6,873)	(4,399)	(11,715)
Proceeds from exercise of stock options	118	69	116
Purchase of noncontrolling interest	0	0	0
Distributions to noncontrolling interest	0	0	0
Contributions from parent	0	0	0
Distributions to parent	0	0	0
Borrowings for real estate investments through variable interest entities		0
Distributions to variable interest entities noncontrolling interest		0
Other, net	0	0	0
Net cash flows from financing activities	(6,755)	(4,342)	(11,833)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	0	0	(57)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	0	0	57
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	0	0	0
Intermediate Holding Companies
NET CASH FLOWS FROM OPERATING ACTIVITIES	76	120	187
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(67)	(16)	0
Change in accrued expenses related to capital expenditures	0	0	0
Real estate investments through variable interest entities	(148)	(21)	(105)
Contribution to subsidiaries	(59)	(142)	0
Distributions from subsidiaries	7,891	5,178	13,488
Other, net	(30)	(20)	0
Net cash flows from investing activities	7,587	4,979	13,383
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	0	0	0
Repayments of long-term debt	0	0	0
Borrowings (repayments) of loans payable - related parties		0	0
Payments for debt issuance costs	0	0	0
Purchase of treasury stock	0	0	0
Proceeds from exercise of stock options	0	0	0
Purchase of noncontrolling interest	(885)	(656)	(1,665)
Distributions to noncontrolling interest	(152)	(152)	(151)
Contributions from parent	119	69	115
Distributions to parent	(6,910)	(4,421)	(11,732)
Borrowings for real estate investments through variable interest entities		342
Distributions to variable interest entities noncontrolling interest		107
Other, net	0	0	0
Net cash flows from financing activities	(7,828)	(4,925)	(13,433)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(165)	174	137
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	465	291	154
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	300	465	291
CCO Holdings
NET CASH FLOWS FROM OPERATING ACTIVITIES	(1,051)	(1,009)	(814)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	0	0	0
Change in accrued expenses related to capital expenditures	0	0	0
Real estate investments through variable interest entities	0	0	0
Contribution to subsidiaries	(2,860)	(142)	(693)
Distributions from subsidiaries	9,068	6,187	9,598
Other, net	0	0	0
Net cash flows from investing activities	6,208	6,045	8,905
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	4,584	0	6,231
Repayments of long-term debt	(1,366)	0	(775)
Borrowings (repayments) of loans payable - related parties		0	0
Payments for debt issuance costs	(43)	0	(59)
Purchase of treasury stock	0	0	0
Proceeds from exercise of stock options	0	0	0
Purchase of noncontrolling interest	0	0	0
Distributions to noncontrolling interest	0	0	0
Contributions from parent	59	142	0
Distributions to parent	(7,891)	(5,178)	(13,488)
Borrowings for real estate investments through variable interest entities		0
Distributions to variable interest entities noncontrolling interest		0
Other, net	0	0	0
Net cash flows from financing activities	(4,657)	(5,036)	(8,091)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	500	0	0
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	0	0	0
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	500	0	0
Charter Operating and Restricted Subsidiaries
NET CASH FLOWS FROM OPERATING ACTIVITIES	12,759	12,666	12,422
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(7,195)	(9,109)	(8,681)
Change in accrued expenses related to capital expenditures	55	(470)	820
Real estate investments through variable interest entities	0	0	0
Contribution to subsidiaries	0	0	0
Distributions from subsidiaries	0	0	0
Other, net	54	(100)	(132)
Net cash flows from investing activities	(7,086)	(9,679)	(7,993)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	15,101	13,820	19,045
Repayments of long-term debt	(11,943)	(10,769)	(15,732)
Borrowings (repayments) of loans payable - related parties		12	234
Payments for debt issuance costs	(60)	(29)	(52)
Purchase of treasury stock	0	0	0
Proceeds from exercise of stock options	0	0	0
Purchase of noncontrolling interest	0	0	0
Distributions to noncontrolling interest	(2)	(1)	(2)
Contributions from parent	2,860	142	693
Distributions to parent	(9,068)	(6,187)	(9,598)
Borrowings for real estate investments through variable interest entities		0
Distributions to variable interest entities noncontrolling interest		0
Other, net	(112)	(5)	(11)
Net cash flows from financing activities	(3,224)	(3,017)	(5,423)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	2,449	(30)	(994)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	300	330	1,324
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	$ 2,749	$ 300	$ 330