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FAIR VALUE MEASUREMENT - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Amount |  |
Liabilities: |  |
Debt, fair value | $ 26,789,276 | $ 26,562,705
Estimated Fair Value |  |
Liabilities: |  |
Debt, fair value | 27,480,125 | 27,811,011
Fair Value, Inputs, Level 2 [Member] | Carrying Amount | Credit facility debt | CSC Holdings |  |
Liabilities: |  |
Debt, fair value | 7,954,232 | 8,288,000
Fair Value, Inputs, Level 2 [Member] | Carrying Amount | Secured Debt [Member] | CSC Holdings |  |
Liabilities: |  |
Debt, fair value | 1,687,530 | 1,617,506
Fair Value, Inputs, Level 2 [Member] | Carrying Amount | Senior guaranteed notes and senior secured notes | CSC Holdings |  |
Liabilities: |  |
Debt, fair value | 8,075,370 | 8,066,796
Fair Value, Inputs, Level 2 [Member] | Carrying Amount | Senior notes | CSC Holdings |  |
Liabilities: |  |
Debt, fair value | 8,932,157 | 8,415,602
Fair Value, Inputs, Level 2 [Member] | Carrying Amount | Notes payable and supply chain financing | CSC Holdings |  |
Liabilities: |  |
Debt, fair value | 139,987 | 174,801
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value | Credit facility debt | CSC Holdings |  |
Liabilities: |  |
Debt, fair value | 8,010,813 | 8,350,188
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value | Secured Debt [Member] | CSC Holdings |  |
Liabilities: |  |
Debt, fair value | 1,752,165 | 1,692,724
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value | Senior guaranteed notes and senior secured notes | CSC Holdings |  |
Liabilities: |  |
Debt, fair value | 8,361,375 | 8,567,858
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value | Senior notes | CSC Holdings |  |
Liabilities: |  |
Debt, fair value | 9,215,990 | 9,024,990
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value | Notes payable and supply chain financing | CSC Holdings |  |
Liabilities: |  |
Debt, fair value | 139,782 | 175,251
Fair Value Measured on a Recurring Basis | Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Investment securities |  | 2,250,854
Prepaid forward contracts | Fair Value Measured on a Recurring Basis | Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Derivative asset | 0 | 45,653
Liabilities: |  |
Derivative liability | 400,258 | 293,506
Interest rate swap contracts | Fair Value Measured on a Recurring Basis | Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Derivative asset | 3,967 | 9,906
Liabilities: |  |
Derivative liability | 189,891 | 275,297
Money market funds | Fair Value Measured on a Recurring Basis | Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Money market funds | $ 115,486 | $ 50,236

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