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DERIVATIVE CONTRACTS AND COLLATERALIZED INDEBTEDNESS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Derivative [Line Items] |  |
Gain (Loss) on Price Risk Derivative Instruments Not Designated as Hedging Instruments | $ 101,074 | $ (53,565)
Change in the fair value of Comcast common stock included in gain (loss) on investments | (150,773) | 73,453
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments | 123,147 | 75,653
Notes related to derivative contracts |  |
Derivative [Line Items] |  |
Gain (Loss) on Price Risk Derivative Instruments Not Designated as Hedging Instruments | $ 101,074 | $ (53,565)

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