DESCRIPTION OF BUSINESS AND RELATED MATTERS	3 Months Ended
DESCRIPTION OF BUSINESS AND RELATED MATTERS	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS AND RELATED MATTERS	DESCRIPTION OF BUSINESS AND RELATED MATTERS The Company and Related Matters Altice USA, Inc. ("Altice USA") was incorporated in Delaware on September 14, 2015. Through June 8, 2018, Altice USA was majority-owned by Altice Europe N.V. ("Altice Europe"), a public company with limited liability (naamloze vennootshcap) under Dutch law. On June 8, 2018, Altice Europe distributed substantially all of its equity interest in the Company through a distribution in kind to holders of Altice Europe's common shares A and common shares B (the "Distribution"). Altice USA is now majority-owned by Patrick Drahi through Next Alt. S.a.r.l. ("Next Alt"). Altice USA is a holding company that does not conduct any business operations of its own. Altice Europe, through a subsidiary, acquired Cequel Corporation ("Cequel" or "Suddenlink") on December 21, 2015 and Cequel was contributed to Altice USA on June 9, 2016. Altice USA acquired Cablevision Systems Corporation ("Cablevision" or "Optimum") on June 21, 2016. Altice USA, through CSC Holdings, LLC (a wholly-owned subsidiary of Cablevision) and its consolidated subsidiaries ("CSC Holdings," and collectively with Altice USA, the "Company"), principally provides broadband communications and video services in the United States. It markets its residential services primarily under two brands: Optimum, in the New York metropolitan area, and Suddenlink, principally in markets in the south-central United States. It operates enterprise services under the brands Lightpath and Altice Business. It delivers broadband, video, telephony services, proprietary content and advertising services to residential and business customers. In September 2019, the Company launched Altice Mobile, a full service voice and data offering, to consumers across its footprint. As these brands are managed on a consolidated basis, the Company classifies its operations in one segment. The accompanying consolidated financial statements of Altice USA include the accounts of Altice USA and its majority-owned subsidiaries and the accompanying consolidated financial statements of CSC Holdings include the accounts of CSC Holdings and its majority-owned subsidiaries and gives effect to the ATS Acquisition and the i24 Acquisition discussed below. Altice USA has no business operations independent of its CSC Holdings subsidiary, whose operating results and financial position are consolidated into Altice USA. The consolidated balance sheets and statements of operations of Altice USA are essentially identical to the consolidated balance sheets and statements of operations of CSC Holdings, with the following exceptions: Altice USA has additional cash and deferred taxes on its consolidated balance sheet. In addition, CSC Holdings and its subsidiaries have certain intercompany receivables from and payables to Altice USA. Differences between Altice USA's results of operations and those of CSC Holdings primarily include incremental interest expense for periods prior to the assumption of Cablevision senior notes by CSC Holdings in November 2019, interest income, loss (gain) on investments and sale of affiliate interests, net, loss on extinguishment of debt, the write-off of deferred financing costs, and income tax benefit (expense). The combined notes to the consolidated financial statements relate to the Company, which, except as noted, are essentially identical for Altice USA and CSC Holdings. All significant intercompany transactions and balances between Altice USA or CSC Holdings and their respective consolidated subsidiaries are eliminated in both sets of consolidated financial statements. Intercompany transactions between Altice USA and CSC Holdings are not eliminated in the CSC Holdings consolidated financial statements, but are eliminated in the Altice USA consolidated financial statements. The financial statements of CSC Holdings are included herein as supplemental information as CSC Holdings is not an SEC registrant. Stock Repurchase Plan In June 2018, the Board of Directors of Altice USA authorized a share repurchase program of $2.0 billion, and on July 30, 2019, the Board of Directors authorized a new incremental three-year share repurchase program of $5.0 billion that took effect following the completion in August 2019 of the $2.0 billion repurchase program. Under these repurchase programs, shares of Altice USA Class A common stock may be purchased from time to time in the open market and may include trading plans entered into with one or more brokerage firms in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934. Size and timing of these purchases will be determined based on market conditions and other factors. For the three months ended March 31, 2020, Altice USA repurchased an aggregate of 31,216,259 shares for a total purchase price of approximately $749,998. From inception through March 31, 2020, Altice USA repurchased an aggregate of 131,913,651 shares for a total purchase price of approximately $2,936,872. These acquired shares were retired and the cost of these shares was recorded in paid in capital in Altice USA's consolidated balance sheet. As of March 31, 2020, Altice USA had approximately $4,063,128 of availability remaining under the incremental share repurchase program and had 602,985,950 combined Class A and Class B shares outstanding.