Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 773	$ 621	$ 694	$ 1,535
Accounts receivable, net	1,619	1,635
Receivables from related party	0	0
Prepaid expenses and other current assets	358	299
Total current assets	2,750	2,555
INVESTMENT IN CABLE PROPERTIES:
Property, plant and equipment, net	34,411	33,888
Customer relationships, net	10,710	11,951
Franchises	67,319	67,319
Goodwill	29,554	29,554
Total investment in cable properties, net	141,994	142,712
INVESTMENT IN SUBSIDIARIES	0	0
LOANS RECEIVABLE - RELATED PARTY	0	0
OTHER NONCURRENT ASSETS	1,507	1,356
Total assets	146,251	146,623
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	8,637	9,045
Payables to related party	0	0
Current portion of long-term debt	5,387	2,045
Total current liabilities	14,024	11,090
LONG-TERM DEBT	66,730	68,186
LOANS PAYABLE - RELATED PARTY	0	0
DEFERRED INCOME TAXES	17,376	17,314
OTHER LONG-TERM LIABILITIES	2,479	2,502
SHAREHOLDERS'/MEMBER'S EQUITY
Controlling interest	37,443	39,084
Noncontrolling interests	8,199	8,447
Total shareholders'/member's equity	45,642	47,531
Total liabilities and shareholders'/member's equity	146,251	146,623
Eliminations [Member]
CURRENT ASSETS:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Receivables from related party	(522)	(690)
Prepaid expenses and other current assets	0	0
Total current assets	(522)	(690)
INVESTMENT IN CABLE PROPERTIES:
Property, plant and equipment, net	0	0
Customer relationships, net	0	0
Franchises	0	0
Goodwill	0	0
Total investment in cable properties, net	0	0
INVESTMENT IN SUBSIDIARIES	(196,695)	(201,801)
LOANS RECEIVABLE - RELATED PARTY	(1,446)	(1,399)
OTHER NONCURRENT ASSETS	0	0
Total assets	(198,663)	(203,890)
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	0	0
Payables to related party	(522)	(690)
Current portion of long-term debt	0	0
Total current liabilities	(522)	(690)
LONG-TERM DEBT	0	0
LOANS PAYABLE - RELATED PARTY	(1,446)	(1,399)
DEFERRED INCOME TAXES	0	0
OTHER LONG-TERM LIABILITIES	0	0
SHAREHOLDERS'/MEMBER'S EQUITY
Controlling interest	(196,695)	(201,801)
Noncontrolling interests	0	0
Total shareholders'/member's equity	(196,695)	(201,801)
Total liabilities and shareholders'/member's equity	(198,663)	(203,890)
Charter [Member]
CURRENT ASSETS:
Cash and cash equivalents	0	0	23	57
Accounts receivable, net	0	0
Receivables from related party	27	22
Prepaid expenses and other current assets	10	22
Total current assets	37	44
INVESTMENT IN CABLE PROPERTIES:
Property, plant and equipment, net	0	0
Customer relationships, net	0	0
Franchises	0	0
Goodwill	0	0
Total investment in cable properties, net	0	0
INVESTMENT IN SUBSIDIARIES	54,679	56,263
LOANS RECEIVABLE - RELATED PARTY	246	233
OTHER NONCURRENT ASSETS	0	0
Total assets	54,962	56,540
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	3	4
Payables to related party	0	0
Current portion of long-term debt	0	0
Total current liabilities	3	4
LONG-TERM DEBT	0	0
LOANS PAYABLE - RELATED PARTY	0	0
DEFERRED INCOME TAXES	17,331	17,268
OTHER LONG-TERM LIABILITIES	185	184
SHAREHOLDERS'/MEMBER'S EQUITY
Controlling interest	37,443	39,084
Noncontrolling interests	0	0
Total shareholders'/member's equity	37,443	39,084
Total liabilities and shareholders'/member's equity	54,962	56,540
Intermediate Holding Companies [Member]
CURRENT ASSETS:
Cash and cash equivalents	289	291	150	154
Accounts receivable, net	28	24
Receivables from related party	447	613
Prepaid expenses and other current assets	53	34
Total current assets	817	962
INVESTMENT IN CABLE PROPERTIES:
Property, plant and equipment, net	330	336
Customer relationships, net	0	0
Franchises	0	0
Goodwill	0	0
Total investment in cable properties, net	330	336
INVESTMENT IN SUBSIDIARIES	61,794	63,558
LOANS RECEIVABLE - RELATED PARTY	674	655
OTHER NONCURRENT ASSETS	216	223
Total assets	63,831	65,734
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	835	900
Payables to related party	0	0
Current portion of long-term debt	0	0
Total current liabilities	835	900
LONG-TERM DEBT	0	0
LOANS PAYABLE - RELATED PARTY	0	0
DEFERRED INCOME TAXES	13	14
OTHER LONG-TERM LIABILITIES	129	134
SHAREHOLDERS'/MEMBER'S EQUITY
Controlling interest	54,679	56,263
Noncontrolling interests	8,175	8,423
Total shareholders'/member's equity	62,854	64,686
Total liabilities and shareholders'/member's equity	63,831	65,734
CCO Holdings [Member]
CURRENT ASSETS:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Receivables from related party	48	55
Prepaid expenses and other current assets	0	0
Total current assets	48	55
INVESTMENT IN CABLE PROPERTIES:
Property, plant and equipment, net	0	0
Customer relationships, net	0	0
Franchises	0	0
Goodwill	0	0
Total investment in cable properties, net	0	0
INVESTMENT IN SUBSIDIARIES	80,222	81,980
LOANS RECEIVABLE - RELATED PARTY	526	511
OTHER NONCURRENT ASSETS	0	0
Total assets	80,796	82,546
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	283	280
Payables to related party	0	0
Current portion of long-term debt	0	0
Total current liabilities	283	280
LONG-TERM DEBT	18,719	18,708
LOANS PAYABLE - RELATED PARTY	0	0
DEFERRED INCOME TAXES	0	0
OTHER LONG-TERM LIABILITIES	0	0
SHAREHOLDERS'/MEMBER'S EQUITY
Controlling interest	61,794	63,558
Noncontrolling interests	0	0
Total shareholders'/member's equity	61,794	63,558
Total liabilities and shareholders'/member's equity	80,796	82,546
Charter Operating and Restricted Subsidiaries [Member]
CURRENT ASSETS:
Cash and cash equivalents	484	330	$ 521	$ 1,324
Accounts receivable, net	1,591	1,611
Receivables from related party	0	0
Prepaid expenses and other current assets	295	243
Total current assets	2,370	2,184
INVESTMENT IN CABLE PROPERTIES:
Property, plant and equipment, net	34,081	33,552
Customer relationships, net	10,710	11,951
Franchises	67,319	67,319
Goodwill	29,554	29,554
Total investment in cable properties, net	141,664	142,376
INVESTMENT IN SUBSIDIARIES	0	0
LOANS RECEIVABLE - RELATED PARTY	0	0
OTHER NONCURRENT ASSETS	1,291	1,133
Total assets	145,325	145,693
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	7,516	7,861
Payables to related party	522	690
Current portion of long-term debt	5,387	2,045
Total current liabilities	13,425	10,596
LONG-TERM DEBT	48,011	49,478
LOANS PAYABLE - RELATED PARTY	1,446	1,399
DEFERRED INCOME TAXES	32	32
OTHER LONG-TERM LIABILITIES	2,165	2,184
SHAREHOLDERS'/MEMBER'S EQUITY
Controlling interest	80,222	81,980
Noncontrolling interests	24	24
Total shareholders'/member's equity	80,246	82,004
Total liabilities and shareholders'/member's equity	$ 145,325	$ 145,693