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Related Party Transactions (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
12 Months Ended 1 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2013
Dec. 31, 2013
May 01, 2013
Related Party Transaction [Line Items]            
Related Party Transaction, Expenses from Transactions with Related Party $ 346,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 305,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty $ 247,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty      
Dr. John Malone's, a member of Charter's board of directors, ownership percentage in Discovery Communications, Inc. (percentage) 4.50%chtr_Dr.JohnMalonesamemberofChartersboardofdirectorsownershippercentageinDiscoveryCommunicationsInc.          
Dr. John Malone's, a member of Charter's board of directors, voting interest in Discovery Communications, Inc. for election of directors (percentage) 28.90%chtr_Dr.JohnMalonesamemberofChartersboardofdirectorsvotinginterestinDiscoveryCommunicationsInc.forelectionofdirectors          
Dr. John Malone's, a member of Charter's board of directors, ownership percentage in Starz (percentage) 10.10%chtr_Dr.JohnMalonesamemberofChartersboardofdirectorsownershippercentageinStarz          
Dr. John Malone's, a member of Charter's board of directors, voting interest in Starz (percentage) 45.50%chtr_Dr.JohnMalonesamemberofChartersboardofdirectorsvotinginterestinStarz          
Liberty Media [Member]            
Related Party Transaction [Line Items]            
Number of shares acquired from beneficial owners (in shares)       26.9chtr_Numberofsharesacquiredfrombeneficialowners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyMediaMember
   
Number of warrants acquired from beneficial owners (in warrants)       1.1chtr_Numberofwarrantsacquiredfrombeneficialowners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyMediaMember
   
Amount paid for interest in Charter       2,600,000,000chtr_AmountpaidforinterestinCharter
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyMediaMember
   
Price paid per share for interest in Charter (in dollars per share)       $ 95.50chtr_PricepaidpershareforinterestinCharter
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyMediaMember
   
Equity Method Investment, Ownership Percentage (percentage)           27.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyMediaMember
Equity method investment, maximum ownership percentage until January 2016 (percentage)           35.00%chtr_EquitymethodinvestmentmaximumownershippercentageuntilJanuary2016
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyMediaMember
Equity method investment, maximum ownership percentage after January 2016 (percentage)           39.99%chtr_EquitymethodinvestmentmaximumownershippercentageafterJanuary2016
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyMediaMember
Limitation on percent of outstanding stock owned by Liberty 5.00%chtr_MaximumpercentageofoutstandingClassAstockthatcanbeheldbyLibertyBroadband
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyMediaMember
         
Liberty Interactive [Member]            
Related Party Transaction [Line Items]            
Dr. John Malone's, a member of Charter's board of directors, voting interest in Liberty Interactive Corp. (percentage) 36.00%chtr_Dr.JohnMalonesamemberofChartersboardofdirectorsvotinginterestinLibertyInteractiveCorp.
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyInteractiveMember
         
Liberty Interactive Corp.'s ownership percentage in HSN, Inc. (percentage) 37.60%chtr_LibertyInteractiveCorp.sownershippercentageinHSNInc.
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyInteractiveMember
         
Percent of board members Liberty Interactive Corp. can elect to HSN Inc.'s board (percentage) 20.00%chtr_PercentofboardmembersLibertyInteractiveCorp.canelecttoHSNInc.sboard
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyInteractiveMember
         
Related Party Transaction, Amounts of Transaction $ 14,000,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyInteractiveMember
      $ 10,000,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyInteractiveMember
 
Minimum [Member] | Liberty Media [Member]            
Related Party Transaction [Line Items]            
Equity Method Investment, Ownership Percentage (percentage) 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= chtr_LibertyMediaMember
         
Maximum [Member]            
Related Party Transaction [Line Items]            
Percent of total operating costs and expenses paid to Discovery and Starz (percentage) 3.00%chtr_PercentoftotaloperatingcostsandexpensespaidtoDiscoveryandStarz
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
      3.00%chtr_PercentoftotaloperatingcostsandexpensespaidtoDiscoveryandStarz
/ us-gaap_RangeAxis
= us-gaap_MaximumMember