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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash held - offsetting derivative net asset positions under master-netting arrangements | $ 0 | $ 0
Cash posted - total | 275,700 | 157,000
Cash posted - offsetting derivative net liability positions under master-netting arrangements | 197,500 | 99,600
Cash posted - remaining in excess of derivative net liability positions included in consolidated Balance Sheets | 78,200 | 57,400
Long-term debt, fair value | 14,300,000 | 15,600,000
Long-term debt | 13,600,000 | 13,600,000
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 320,889 |
Derivative liabilities |  |
Derivative liability, fair value, gross | (582,770) |
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 316,469 | 204,161
Derivative liabilities |  |
Derivative liability, fair value, gross | (513,982) | (303,740)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 4,420 |
Derivative liabilities |  |
Interest-rate contracts | (68,788) | (145,524)
Fair Value, Recurring [Member] |  |
Derivative assets |  |
Derivative assets | 4,420 | 0
Derivative assets netting | (316,469) | (204,161)
Derivative liabilities |  |
Derivative liabilities | (68,788) | (145,524)
Derivative liabilities netting | 513,982 | 303,740
Fair Value, Recurring [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative assets netting | (316,469) | (204,161)
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Derivative liabilities netting | 513,982 | 303,740
Fair Value, Recurring [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 4,420 |
Derivative assets netting | 0 |
Derivative liabilities |  |
Interest-rate contracts | (68,788) | (145,524)
Derivative liabilities netting | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 58,373 | 22,019
Derivative liabilities |  |
Derivative liability, fair value, gross | (171,737) | (67,226)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 58,373 | 22,019
Derivative liabilities |  |
Derivative liability, fair value, gross | (171,737) | (67,226)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 0 |
Derivative liabilities |  |
Interest-rate contracts | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 256,254 | 172,833
Derivative liabilities |  |
Derivative liability, fair value, gross | (214,940) | (258,446)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 251,834 | 172,833
Derivative liabilities |  |
Derivative liability, fair value, gross | (146,152) | (112,922)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 4,420 |
Derivative liabilities |  |
Interest-rate contracts | (68,788) | (145,524)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 6,262 | 9,309
Derivative liabilities |  |
Derivative liability, fair value, gross | (196,093) | (123,592)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 6,262 | 9,309
Derivative liabilities |  |
Derivative liability, fair value, gross | (196,093) | (123,592)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 0 |
Derivative liabilities |  |
Interest-rate contracts | $ 0 | $ 0

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