Mergers and Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Preliminary allocation of purchase price:
Goodwill		$ 29,554		$ 29,509
Pro forma financial information:
Pro forma revenues			$ 29,748
Pro forma net income attributable to Charter shareholders			$ 616
Earnings per common share attributable to Charter shareholders, basic			$ 2.28
Earnings per common share attributable to Charter shareholders, diluted			$ 2.25
TWC Transaction [Member]
Business Acquisition Information by Acquisition:
TWC enterprise value including cash, equity and debt assumed		85,000
Preliminary allocation of purchase price:
Cash and cash equivalents		1,058
Current assets		1,417
Property, plant and equipment		21,413
Customer relationships		13,460
Franchises		54,085
Goodwill		28,337
Other noncurrent assets		1,040
Accounts payable and accrued liabilities		(4,107)
Debt		(24,900)
Deferred income taxes		(28,120)
Other long-term liabilities		(3,162)
Noncontrolling interests		(4)
Total assets acquired plus goodwill less liabilities assumed and noncontrolling interests acquired		60,517
Measurement period adjustment, working capital	$ 73
Measurement period adjustment, deferred income taxes	28
Measurement period adjustments impact on goodwill	$ 45
Bright House Transaction [Member]
Business Acquisition Information by Acquisition:
Business Combination, Consideration Transferred		12,200
Preliminary allocation of purchase price:
Current assets		131
Property, plant and equipment		2,884
Customer relationships		2,150
Franchises		7,225
Goodwill		44
Other noncurrent assets		86
Accounts payable and accrued liabilities		(330)
Other long-term liabilities		(12)
Noncontrolling interests		(22)
Total assets acquired plus goodwill less liabilities assumed and noncontrolling interests acquired		$ 12,156