Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Consolidating Statements of Operations
REVENUES	$ 10,854	$ 10,357	$ 21,511	$ 20,521
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)	6,873	6,575	13,709	13,154
Depreciation and amortization	2,592	2,595	5,302	5,145
Other operating expenses, net	29	135	98	229
Total costs and expenses	9,494	9,305	19,109	18,528
Income from operations	1,360	1,052	2,402	1,993
OTHER INCOME (EXPENSES):
Interest income (expense), net	(878)	(749)	(1,729)	(1,462)
Loss on extinguishment of debt	0	(1)	0	(35)
Loss on financial instruments, net	(75)	(70)	(12)	(32)
Other income (expense), net	(27)	11	(30)	15
Equity in income of subsidiaries			0	0
Total other income (expense)	(980)	(809)	(1,771)	(1,514)
Income before income taxes	380	243	631	479
Income tax expense	(41)	(48)	(69)	(73)
Consolidated net income	339	195	562	406
Less: Net income attributable to noncontrolling interests	(66)	(56)	(121)	(112)
Net income	$ 273	139	441	294
Eliminations [Member]
Condensed Consolidating Statements of Operations
REVENUES			(579)	(680)
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)			(579)	(680)
Depreciation and amortization			0	0
Other operating expenses, net			0	0
Total costs and expenses			(579)	(680)
Income from operations			0	0
OTHER INCOME (EXPENSES):
Interest income (expense), net			0	0
Loss on extinguishment of debt			0	0
Loss on financial instruments, net			0	0
Other income (expense), net			0	0
Equity in income of subsidiaries			(2,241)	(1,648)
Total other income (expense)			(2,241)	(1,648)
Income before income taxes			(2,241)	(1,648)
Income tax expense			0	0
Consolidated net income			(2,241)	(1,648)
Less: Net income attributable to noncontrolling interests			0	0
Net income			(2,241)	(1,648)
Charter [Member]
Condensed Consolidating Statements of Operations
REVENUES			27	61
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)			27	61
Depreciation and amortization			0	0
Other operating expenses, net			0	0
Total costs and expenses			27	61
Income from operations			0	0
OTHER INCOME (EXPENSES):
Interest income (expense), net			4	2
Loss on extinguishment of debt			0	0
Loss on financial instruments, net			0	0
Other income (expense), net			0	0
Equity in income of subsidiaries			495	327
Total other income (expense)			499	329
Income before income taxes			499	329
Income tax expense			(58)	(35)
Consolidated net income			441	294
Less: Net income attributable to noncontrolling interests			0	0
Net income			441	294
Intermediate Holding Companies [Member]
Condensed Consolidating Statements of Operations
REVENUES			560	619
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)			537	607
Depreciation and amortization			5	5
Other operating expenses, net			4	0
Total costs and expenses			546	612
Income from operations			14	7
OTHER INCOME (EXPENSES):
Interest income (expense), net			13	9
Loss on extinguishment of debt			0	0
Loss on financial instruments, net			0	0
Other income (expense), net			(25)	(11)
Equity in income of subsidiaries			619	442
Total other income (expense)			607	440
Income before income taxes			621	447
Income tax expense			(6)	(9)
Consolidated net income			615	438
Less: Net income attributable to noncontrolling interests			(120)	(111)
Net income			495	327
CCO Holdings [Member]
Condensed Consolidating Statements of Operations
REVENUES			0	0
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)			0	0
Depreciation and amortization			0	0
Other operating expenses, net			0	0
Total costs and expenses			0	0
Income from operations			0	0
OTHER INCOME (EXPENSES):
Interest income (expense), net			(508)	(404)
Loss on extinguishment of debt		$ 0	0	(33)
Loss on financial instruments, net			0	0
Other income (expense), net			0	0
Equity in income of subsidiaries			1,127	879
Total other income (expense)			619	442
Income before income taxes			619	442
Income tax expense			0	0
Consolidated net income			619	442
Less: Net income attributable to noncontrolling interests			0	0
Net income			619	442
Charter Operating and Restricted Subsidiaries [Member]
Condensed Consolidating Statements of Operations
REVENUES			21,503	20,521
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)			13,724	13,166
Depreciation and amortization			5,297	5,140
Other operating expenses, net			94	229
Total costs and expenses			19,115	18,535
Income from operations			2,388	1,986
OTHER INCOME (EXPENSES):
Interest income (expense), net			(1,238)	(1,069)
Loss on extinguishment of debt			0	(2)
Loss on financial instruments, net			(12)	(32)
Other income (expense), net			(5)	26
Equity in income of subsidiaries			0	0
Total other income (expense)			(1,255)	(1,077)
Income before income taxes			1,133	909
Income tax expense			(5)	(29)
Consolidated net income			1,128	880
Less: Net income attributable to noncontrolling interests			(1)	(1)
Net income			$ 1,127	$ 879