Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Condensed Consolidating Statements of Cash Flows
Net cash flows from operating activities	$ 5,795	$ 5,788
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(4,574)	(3,703)
Change in accrued expenses related to capital expenditures	(466)	197
Contributions to subsidiaries	0	0
Distributions from subsidiaries	0	0
Other, net	(67)	(49)
Net cash flows from investing activities	(5,107)	(3,555)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	5,628	7,146
Repayments of long-term debt	(3,500)	(5,529)
Borrowings (repayments) loans payable - related parties	0	0
Payments for debt issuance costs	(17)	(42)
Purchase of treasury stock	(2,281)	(4,223)
Proceeds from exercise of stock options	43	86
Purchase of noncontrolling interest	(328)	(429)
Distributions to noncontrolling interest	(76)	(75)
Contributions from parent	0	0
Distributions to parent	0	0
Other, net	(5)	(8)
Net cash flows from financing activities	(536)	(3,074)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	152	(841)
CASH AND CASH EQUIVALENTS, beginning of period	621	1,535
CASH AND CASH EQUIVALENTS, end of period	773	694
Eliminations [Member]
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	0	0
Change in accrued expenses related to capital expenditures	0	0
Contributions to subsidiaries	197	780
Distributions from subsidiaries	(8,096)	(12,083)
Other, net	0	0
Net cash flows from investing activities	(7,899)	(11,303)
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	0
Payments for debt issuance costs	0	0
Purchase of treasury stock	0	0
Proceeds from exercise of stock options	0	0
Purchase of noncontrolling interest	0	0
Distributions to noncontrolling interest	0	0
Contributions from parent	(197)	(780)
Distributions to parent	8,096	12,083
Other, net	0	0
Net cash flows from financing activities	7,899	11,303
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0
CASH AND CASH EQUIVALENTS, beginning of period	0	0
CASH AND CASH EQUIVALENTS, end of period	0	0
Charter [Member]
Condensed Consolidating Statements of Cash Flows
Net cash flows from operating activities	6	135
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	0	0
Change in accrued expenses related to capital expenditures	0	0
Contributions to subsidiaries	(43)	(87)
Distributions from subsidiaries	2,282	4,233
Other, net	0	0
Net cash flows from investing activities	2,239	4,146
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)	(178)
Payments for debt issuance costs	0	0
Purchase of treasury stock	(2,281)	(4,223)
Proceeds from exercise of stock options	43	86
Purchase of noncontrolling interest	0	0
Distributions to noncontrolling interest	0	0
Contributions from parent	0	0
Distributions to parent	0	0
Other, net	0	0
Net cash flows from financing activities	(2,245)	(4,315)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	(34)
CASH AND CASH EQUIVALENTS, beginning of period	0	57
CASH AND CASH EQUIVALENTS, end of period	0	23
Intermediate Holding Companies [Member]
Condensed Consolidating Statements of Cash Flows
Net cash flows from operating activities	73	25
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	0	0
Change in accrued expenses related to capital expenditures	0	0
Contributions to subsidiaries	(77)	0
Distributions from subsidiaries	2,656	4,622
Other, net	(12)	0
Net cash flows from investing activities	2,567	4,622
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	0
Payments for debt issuance costs	0	0
Purchase of treasury stock	0	0
Proceeds from exercise of stock options	0	0
Purchase of noncontrolling interest	(328)	(429)
Distributions to noncontrolling interest	(75)	(75)
Contributions from parent	43	87
Distributions to parent	(2,282)	(4,233)
Other, net	0	(1)
Net cash flows from financing activities	(2,642)	(4,651)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(2)	(4)
CASH AND CASH EQUIVALENTS, beginning of period	291	154
CASH AND CASH EQUIVALENTS, end of period	289	150
CCO Holdings [Member]
Condensed Consolidating Statements of Cash Flows
Net cash flows from operating activities	(502)	(353)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	0	0
Change in accrued expenses related to capital expenditures	0	0
Contributions to subsidiaries	(77)	(693)
Distributions from subsidiaries	3,158	3,228
Other, net	0	0
Net cash flows from investing activities	3,081	2,535
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	0	3,246
Repayments of long-term debt	0	(775)
Borrowings (repayments) loans payable - related parties	0	0
Payments for debt issuance costs	0	(31)
Purchase of treasury stock	0	0
Proceeds from exercise of stock options	0	0
Purchase of noncontrolling interest	0	0
Distributions to noncontrolling interest	0	0
Contributions from parent	77	0
Distributions to parent	(2,656)	(4,622)
Other, net	0	0
Net cash flows from financing activities	(2,579)	(2,182)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	0	0
CASH AND CASH EQUIVALENTS, beginning of period	0	0
CASH AND CASH EQUIVALENTS, end of period	0	0
Charter Operating and Restricted Subsidiaries [Member]
Condensed Consolidating Statements of Cash Flows
Net cash flows from operating activities	6,218	5,981
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(4,574)	(3,703)
Change in accrued expenses related to capital expenditures	(466)	197
Contributions to subsidiaries	0	0
Distributions from subsidiaries	0	0
Other, net	(55)	(49)
Net cash flows from investing activities	(5,095)	(3,555)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	5,628	3,900
Repayments of long-term debt	(3,500)	(4,754)
Borrowings (repayments) loans payable - related parties	7	178
Payments for debt issuance costs	(17)	(11)
Purchase of treasury stock	0	0
Proceeds from exercise of stock options	0	0
Purchase of noncontrolling interest	0	0
Distributions to noncontrolling interest	(1)	0
Contributions from parent	77	693
Distributions to parent	(3,158)	(3,228)
Other, net	(5)	(7)
Net cash flows from financing activities	(969)	(3,229)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	154	(803)
CASH AND CASH EQUIVALENTS, beginning of period	330	1,324
CASH AND CASH EQUIVALENTS, end of period	$ 484	$ 521

The increase (decrease) during the reporting period in the amounts payable for capital expenditures.

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