Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
REVENUES	$ 11,761	$ 11,450	$ 11,347	$ 11,206	$ 11,231	$ 10,892	$ 10,854	$ 10,657	$ 45,764	$ 43,634	$ 41,581
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)									29,224	27,860	26,541
Depreciation and amortization									9,926	10,318	10,588
Other operating (income) expenses, net									103	235	346
Total costs and expenses									39,253	38,413	37,475
Income from operations	1,959	1,586	1,541	1,425	1,439	1,380	1,360	1,042	6,511	5,221	4,106
OTHER INCOME (EXPENSES):
Interest income (expense), net									(3,797)	(3,540)	(3,090)
Loss on extinguishment of debt									(25)	0	(40)
Gain (loss) on financial instruments, net									(54)	(110)	69
Other pension benefits (costs), net									(69)	192	1
Other expense, net									(135)	(77)	(18)
Equity in income of subsidiaries									0	0	0
Total other income (expenses)									(4,080)	(3,535)	(3,078)
Income before income taxes									2,431	1,686	1,028
Income tax benefit (expense)									(439)	(180)	9,087
Consolidated net income									1,992	1,506	10,115
Less: Net income attributable to noncontrolling interests									(324)	(276)	(220)
Net income	$ 714	$ 387	$ 314	$ 253	$ 296	$ 493	$ 273	$ 168	1,668	1,230	9,895
Eliminations
REVENUES									(1,214)	(1,173)	(1,273)
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)									(1,217)	(1,173)	(1,273)
Depreciation and amortization									0	0	0
Other operating (income) expenses, net									3	0	0
Total costs and expenses									(1,214)	(1,173)	(1,273)
Income from operations									0	0	0
OTHER INCOME (EXPENSES):
Interest income (expense), net									0	0	0
Loss on extinguishment of debt									0		0
Gain (loss) on financial instruments, net									0	0	0
Other pension benefits (costs), net									0	0	0
Other expense, net									0	0	0
Equity in income of subsidiaries									(7,589)	(5,657)	(3,361)
Total other income (expenses)									(7,589)	(5,657)	(3,361)
Income before income taxes									(7,589)	(5,657)	(3,361)
Income tax benefit (expense)									0	0	0
Consolidated net income									(7,589)	(5,657)	(3,361)
Less: Net income attributable to noncontrolling interests									0	0	0
Net income									(7,589)	(5,657)	(3,361)
Charter
REVENUES									52	46	90
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)									52	46	90
Depreciation and amortization									0	0	0
Other operating (income) expenses, net									0	0	(101)
Total costs and expenses									52	46	(11)
Income from operations									0	0	101
OTHER INCOME (EXPENSES):
Interest income (expense), net									10	9	5
Loss on extinguishment of debt									0		0
Gain (loss) on financial instruments, net									0	0	0
Other pension benefits (costs), net									0	0	0
Other expense, net									0	0	0
Equity in income of subsidiaries									1,998	1,377	680
Total other income (expenses)									2,008	1,386	685
Income before income taxes									2,008	1,386	786
Income tax benefit (expense)									(340)	(156)	9,109
Consolidated net income									1,668	1,230	9,895
Less: Net income attributable to noncontrolling interests									0	0	0
Net income									1,668	1,230	9,895
Intermediate Holding Companies
REVENUES									1,170	1,141	1,186
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)									1,114	1,096	1,164
Depreciation and amortization									15	11	9
Other operating (income) expenses, net									(11)	5	3
Total costs and expenses									1,118	1,112	1,176
Income from operations									52	29	10
OTHER INCOME (EXPENSES):
Interest income (expense), net									32	30	20
Loss on extinguishment of debt									0		0
Gain (loss) on financial instruments, net									0	0	0
Other pension benefits (costs), net									0	0	0
Other expense, net									(4)	(31)	(14)
Equity in income of subsidiaries									2,251	1,632	882
Total other income (expenses)									2,279	1,631	888
Income before income taxes									2,331	1,660	898
Income tax benefit (expense)									(10)	(8)	1
Consolidated net income									2,321	1,652	899
Less: Net income attributable to noncontrolling interests									(323)	(275)	(219)
Net income									1,998	1,377	680
CCO Holdings
REVENUES									0	0	0
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)									0	0	0
Depreciation and amortization									0	0	0
Other operating (income) expenses, net									0	0	0
Total costs and expenses									0	0	0
Income from operations									0	0	0
OTHER INCOME (EXPENSES):
Interest income (expense), net									(1,067)	(1,016)	(883)
Loss on extinguishment of debt									(22)		(34)
Gain (loss) on financial instruments, net									0	0	0
Other pension benefits (costs), net									0	0	0
Other expense, net									0	0	0
Equity in income of subsidiaries									3,340	2,648	1,799
Total other income (expenses)									2,251	1,632	882
Income before income taxes									2,251	1,632	882
Income tax benefit (expense)									0	0	0
Consolidated net income									2,251	1,632	882
Less: Net income attributable to noncontrolling interests									0	0	0
Net income									2,251	1,632	882
Charter Operating and Restricted Subsidiaries
REVENUES									45,756	43,620	41,578
COSTS AND EXPENSES:
Operating costs and expenses (exclusive of items shown separately below)									29,275	27,891	26,560
Depreciation and amortization									9,911	10,307	10,579
Other operating (income) expenses, net									111	230	444
Total costs and expenses									39,297	38,428	37,583
Income from operations									6,459	5,192	3,995
OTHER INCOME (EXPENSES):
Interest income (expense), net									(2,772)	(2,563)	(2,232)
Loss on extinguishment of debt									(3)		(6)
Gain (loss) on financial instruments, net									(54)	(110)	69
Other pension benefits (costs), net									(69)	192	1
Other expense, net									(131)	(46)	(4)
Equity in income of subsidiaries									0	0	0
Total other income (expenses)									(3,029)	(2,527)	(2,172)
Income before income taxes									3,430	2,665	1,823
Income tax benefit (expense)									(89)	(16)	(23)
Consolidated net income									3,341	2,649	1,800
Less: Net income attributable to noncontrolling interests									(1)	(1)	(1)
Net income									$ 3,340	$ 2,648	$ 1,799