Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 508			$ 551
Accounts receivable, net	2,284			1,733
Receivables from related party	0			0
Prepaid expenses and other current assets	596			446
Total current assets	3,388			2,730
RESTRICTED CASH	89			214
INVESTMENT IN CABLE PROPERTIES:
Property, plant and equipment, net	34,218			35,126
Customer relationships, net	7,956			9,565
Franchises	67,322			67,319
Goodwill	29,554			29,554
Total investment in cable properties, net	139,050			141,564
INVESTMENT IN SUBSIDIARIES	0			0
OPERATING LEASE RIGHT-OF-USE ASSETS	1,103			0
LOANS RECEIVABLE – RELATED PARTY	0			0
OTHER NONCURRENT ASSETS	1,637			1,622
Total assets	145,267			146,130
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	8,263			8,805
Operating lease liabilities	210			0
Payables to related party	0			0
Current portion of long-term debt	3,509			3,290
Total current liabilities	11,982			12,095
LONG-TERM DEBT	71,390			69,537
LOANS PAYABLE – RELATED PARTY	0			0
DEFERRED INCOME TAXES	17,609			17,389
LONG-TERM OPERATING LEASE LIABILITIES	991			0
OTHER LONG-TERM LIABILITIES	2,773			2,837
SHAREHOLDERS’/MEMBER’S EQUITY
Controlling interest	32,974			36,285
Noncontrolling interests	7,548			7,987
Total shareholders’/member’s equity	40,522	$ 43,094	$ 43,643	44,272	$ 45,228	$ 45,642	$ 47,125	$ 47,531
Total liabilities and shareholders’/member’s equity	145,267			146,130
Eliminations
CURRENT ASSETS:
Cash and cash equivalents	0			0
Accounts receivable, net	0			0
Receivables from related party	(544)			(602)
Prepaid expenses and other current assets	0			0
Total current assets	(544)			(602)
RESTRICTED CASH	0			0
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	(184,316)			(193,082)
OPERATING LEASE RIGHT-OF-USE ASSETS	0
LOANS RECEIVABLE – RELATED PARTY	(1,504)			(1,451)
OTHER NONCURRENT ASSETS	0			(3)
Total assets	(186,364)			(195,138)
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	0			0
Operating lease liabilities	0
Payables to related party	(544)			(602)
Current portion of long-term debt	0			0
Total current liabilities	(544)			(602)
LONG-TERM DEBT	0			0
LOANS PAYABLE – RELATED PARTY	(1,504)			(1,451)
DEFERRED INCOME TAXES	0			(3)
LONG-TERM OPERATING LEASE LIABILITIES	0
OTHER LONG-TERM LIABILITIES	0			0
SHAREHOLDERS’/MEMBER’S EQUITY
Controlling interest	(184,316)			(193,082)
Noncontrolling interests	0			0
Total shareholders’/member’s equity	(184,316)			(193,082)
Total liabilities and shareholders’/member’s equity	(186,364)			(195,138)
Charter
CURRENT ASSETS:
Cash and cash equivalents	0			0
Accounts receivable, net	1			1
Receivables from related party	26			27
Prepaid expenses and other current assets	7			14
Total current assets	34			42
RESTRICTED CASH	0			0
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	50,471			53,592
OPERATING LEASE RIGHT-OF-USE ASSETS	0
LOANS RECEIVABLE – RELATED PARTY	260			251
OTHER NONCURRENT ASSETS	2			0
Total assets	50,767			53,885
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	26			9
Operating lease liabilities	0
Payables to related party	0			0
Current portion of long-term debt	0			0
Total current liabilities	26			9
LONG-TERM DEBT	0			0
LOANS PAYABLE – RELATED PARTY	0			0
DEFERRED INCOME TAXES	17,542			17,376
LONG-TERM OPERATING LEASE LIABILITIES	0
OTHER LONG-TERM LIABILITIES	225			215
SHAREHOLDERS’/MEMBER’S EQUITY
Controlling interest	32,974			36,285
Noncontrolling interests	0			0
Total shareholders’/member’s equity	32,974			36,285
Total liabilities and shareholders’/member’s equity	50,767			53,885
Intermediate Holding Companies
CURRENT ASSETS:
Cash and cash equivalents	218			251
Accounts receivable, net	31			33
Receivables from related party	463			518
Prepaid expenses and other current assets	41			32
Total current assets	753			834
RESTRICTED CASH	89			214
INVESTMENT IN CABLE PROPERTIES:
Property, plant and equipment, net	658			468
Customer relationships, net	0			0
Franchises	0			0
Goodwill	0			0
Total investment in cable properties, net	658			468
INVESTMENT IN SUBSIDIARIES	56,947			60,530
OPERATING LEASE RIGHT-OF-USE ASSETS	173
LOANS RECEIVABLE – RELATED PARTY	699			674
OTHER NONCURRENT ASSETS	237			222
Total assets	59,556			62,942
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	916			893
Operating lease liabilities	30
Payables to related party	0			0
Current portion of long-term debt	0			0
Total current liabilities	946			893
LONG-TERM DEBT	0			0
LOANS PAYABLE – RELATED PARTY	0			0
DEFERRED INCOME TAXES	15			16
LONG-TERM OPERATING LEASE LIABILITIES	197
OTHER LONG-TERM LIABILITIES	402			478
SHAREHOLDERS’/MEMBER’S EQUITY
Controlling interest	50,471			53,592
Noncontrolling interests	7,525			7,963
Total shareholders’/member’s equity	57,996			61,555
Total liabilities and shareholders’/member’s equity	59,556			62,942
CCO Holdings
CURRENT ASSETS:
Cash and cash equivalents	0			0
Accounts receivable, net	0			0
Receivables from related party	55			57
Prepaid expenses and other current assets	0			0
Total current assets	55			57
RESTRICTED CASH	0			0
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	76,898			78,960
OPERATING LEASE RIGHT-OF-USE ASSETS	0
LOANS RECEIVABLE – RELATED PARTY	545			526
OTHER NONCURRENT ASSETS	0			0
Total assets	77,498			79,543
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	302			283
Operating lease liabilities	0
Payables to related party	0			0
Current portion of long-term debt	0			0
Total current liabilities	302			283
LONG-TERM DEBT	20,249			18,730
LOANS PAYABLE – RELATED PARTY	0			0
DEFERRED INCOME TAXES	0			0
LONG-TERM OPERATING LEASE LIABILITIES	0
OTHER LONG-TERM LIABILITIES	0			0
SHAREHOLDERS’/MEMBER’S EQUITY
Controlling interest	56,947			60,530
Noncontrolling interests	0			0
Total shareholders’/member’s equity	56,947			60,530
Total liabilities and shareholders’/member’s equity	77,498			79,543
Charter Operating and Restricted Subsidiaries
CURRENT ASSETS:
Cash and cash equivalents	290			300
Accounts receivable, net	2,252			1,699
Receivables from related party	0			0
Prepaid expenses and other current assets	548			400
Total current assets	3,090			2,399
RESTRICTED CASH	0			0
INVESTMENT IN CABLE PROPERTIES:
Property, plant and equipment, net	33,560			34,658
Customer relationships, net	7,956			9,565
Franchises	67,322			67,319
Goodwill	29,554			29,554
Total investment in cable properties, net	138,392			141,096
INVESTMENT IN SUBSIDIARIES	0			0
OPERATING LEASE RIGHT-OF-USE ASSETS	930
LOANS RECEIVABLE – RELATED PARTY	0			0
OTHER NONCURRENT ASSETS	1,398			1,403
Total assets	143,810			144,898
CURRENT LIABILITIES:
Accounts payable and accrued liabilities	7,019			7,620
Operating lease liabilities	180
Payables to related party	544			602
Current portion of long-term debt	3,509			3,290
Total current liabilities	11,252			11,512
LONG-TERM DEBT	51,141			50,807
LOANS PAYABLE – RELATED PARTY	1,504			1,451
DEFERRED INCOME TAXES	52			0
LONG-TERM OPERATING LEASE LIABILITIES	794
OTHER LONG-TERM LIABILITIES	2,146			2,144
SHAREHOLDERS’/MEMBER’S EQUITY
Controlling interest	76,898			78,960
Noncontrolling interests	23			24
Total shareholders’/member’s equity	76,921			78,984
Total liabilities and shareholders’/member’s equity	$ 143,810			$ 144,898