Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Condensed Consolidating Statements of Cash Flows
NET CASH FLOWS FROM OPERATING ACTIVITIES	$ 8,390	$ 8,599
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(4,913)	(6,692)
Change in accrued expenses related to capital expenditures	(449)	(620)
Real estate investments through variable interest entities	(125)	(15)
Contributions to subsidiaries	0	0
Distributions from subsidiaries	0	0
Other, net	10	(103)
Net cash flows from investing activities	(5,477)	(7,430)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	13,157	11,552
Repayments of long-term debt	(10,886)	(8,964)
Borrowings (repayments) loans payable - related parties		0
Payments for debt issuance costs	(48)	(29)
Purchase of treasury stock	(4,568)	(3,214)
Proceeds from exercise of stock options	106	56
Distributions to noncontrolling interest	(593)	(473)
Distributions to noncontrolling interest	(116)	(114)
Contributions from parent	0	0
Distributions to parent	0	0
Borrowings for real estate investments through variable interest entities	0	170
Distributions to variable interest entities noncontrolling interest	0	(107)
Other, net	(133)	(7)
Repayments of long-term debt	(3,081)	(1,130)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(168)	39
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	765	621
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	597	660
Eliminations
Condensed Consolidating Statements of Cash Flows
NET CASH FLOWS FROM OPERATING ACTIVITIES	0	0
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	67	0
Change in accrued expenses related to capital expenditures	0	0
Real estate investments through variable interest entities	0	0
Contributions to subsidiaries	1,730	310
Distributions from subsidiaries	(15,811)	(11,471)
Other, net	(67)	0
Net cash flows from investing activities	(14,081)	(11,161)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	0	0
Repayments of long-term debt	0	0
Borrowings (repayments) loans payable - related parties		0
Payments for debt issuance costs	0	0
Purchase of treasury stock	0	0
Proceeds from exercise of stock options	0	0
Distributions to noncontrolling interest	0	0
Distributions to noncontrolling interest	0	0
Contributions from parent	(1,730)	(310)
Distributions to parent	15,811	11,471
Borrowings for real estate investments through variable interest entities		0
Distributions to variable interest entities noncontrolling interest		0
Other, net	0	0
Repayments of long-term debt	14,081	11,161
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	0	0
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	0	0
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	0	0
Charter
Condensed Consolidating Statements of Cash Flows
NET CASH FLOWS FROM OPERATING ACTIVITIES	(22)	4
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	0	0
Change in accrued expenses related to capital expenditures	0	0
Real estate investments through variable interest entities	0	0
Contributions to subsidiaries	(117)	(56)
Distributions from subsidiaries	4,601	3,217
Other, net	0	0
Net cash flows from investing activities	4,484	3,161
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	0	0
Repayments of long-term debt	0	0
Borrowings (repayments) loans payable - related parties		(7)
Payments for debt issuance costs	0	0
Purchase of treasury stock	(4,568)	(3,214)
Proceeds from exercise of stock options	106	56
Distributions to noncontrolling interest	0	0
Distributions to noncontrolling interest	0	0
Contributions from parent	0	0
Distributions to parent	0	0
Borrowings for real estate investments through variable interest entities		0
Distributions to variable interest entities noncontrolling interest		0
Other, net	0	0
Repayments of long-term debt	(4,462)	(3,165)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	0	0
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	0	0
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	0	0
Intermediate Holding Companies
Condensed Consolidating Statements of Cash Flows
NET CASH FLOWS FROM OPERATING ACTIVITIES	65	91
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(67)	0
Change in accrued expenses related to capital expenditures	0	0
Real estate investments through variable interest entities	(125)	(15)
Contributions to subsidiaries	(54)	(127)
Distributions from subsidiaries	5,222	3,763
Other, net	(8)	(10)
Net cash flows from investing activities	4,968	3,611
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	0	0
Repayments of long-term debt	0	0
Borrowings (repayments) loans payable - related parties		0
Payments for debt issuance costs	0	0
Purchase of treasury stock	0	0
Proceeds from exercise of stock options	0	0
Distributions to noncontrolling interest	(593)	(473)
Distributions to noncontrolling interest	(114)	(113)
Contributions from parent	117	56
Distributions to parent	(4,601)	(3,217)
Borrowings for real estate investments through variable interest entities		170
Distributions to variable interest entities noncontrolling interest		(107)
Other, net	0	0
Repayments of long-term debt	(5,191)	(3,684)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(158)	18
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	465	291
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	307	309
CCO Holdings
Condensed Consolidating Statements of Cash Flows
NET CASH FLOWS FROM OPERATING ACTIVITIES	(762)	(728)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	0	0
Change in accrued expenses related to capital expenditures	0	0
Real estate investments through variable interest entities	0	0
Contributions to subsidiaries	(1,559)	(127)
Distributions from subsidiaries	5,988	4,491
Other, net	0	0
Net cash flows from investing activities	4,429	4,364
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	1,515	0
Repayments of long-term debt	0	0
Borrowings (repayments) loans payable - related parties		0
Payments for debt issuance costs	(14)	0
Purchase of treasury stock	0	0
Proceeds from exercise of stock options	0	0
Distributions to noncontrolling interest	0	0
Distributions to noncontrolling interest	0	0
Contributions from parent	54	127
Distributions to parent	(5,222)	(3,763)
Borrowings for real estate investments through variable interest entities		0
Distributions to variable interest entities noncontrolling interest		0
Other, net	0	0
Repayments of long-term debt	(3,667)	(3,636)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	0	0
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	0	0
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	0	0
Charter Operating and Restricted Subsidiaries
Condensed Consolidating Statements of Cash Flows
NET CASH FLOWS FROM OPERATING ACTIVITIES	9,109	9,232
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(4,913)	(6,692)
Change in accrued expenses related to capital expenditures	(449)	(620)
Real estate investments through variable interest entities	0	0
Contributions to subsidiaries	0	0
Distributions from subsidiaries	0	0
Other, net	85	(93)
Net cash flows from investing activities	(5,277)	(7,405)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	11,642	11,552
Repayments of long-term debt	(10,886)	(8,964)
Borrowings (repayments) loans payable - related parties		7
Payments for debt issuance costs	(34)	(29)
Purchase of treasury stock	0	0
Proceeds from exercise of stock options	0	0
Distributions to noncontrolling interest	0	0
Distributions to noncontrolling interest	(2)	(1)
Contributions from parent	1,559	127
Distributions to parent	(5,988)	(4,491)
Borrowings for real estate investments through variable interest entities		0
Distributions to variable interest entities noncontrolling interest		0
Other, net	(133)	(7)
Repayments of long-term debt	(3,842)	(1,806)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(10)	21
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period	300	330
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period	$ 290	$ 351