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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands | Jun. 30, 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 | 287,800 | 157,000
Cash posted - offsetting derivative net liability positions under master-netting arrangements | 149,900 | 99,600
Cash posted - remaining in excess of derivative net liability positions included in consolidated Balance Sheets | 137,900 | 57,400
Long-term debt, fair value | 13,100,000 | 15,600,000
Long-term debt | 13,800,000 | 13,600,000
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 188,424 |
Derivative liabilities |  |
Derivative liability, fair value, gross | (339,603) |
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 164,201 | 204,161
Derivative liabilities |  |
Derivative liability, fair value, gross | (314,148) | (303,740)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 24,223 |
Derivative liabilities |  |
Interest-rate contracts | (25,455) | (145,524)
Fair Value, Recurring [Member] |  |
Derivative assets |  |
Derivative assets | 24,223 | 0
Derivative assets netting | (164,201) | (204,161)
Derivative liabilities |  |
Derivative liabilities | (25,455) | (145,524)
Derivative liabilities netting | 314,148 | 303,740
Fair Value, Recurring [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative assets netting | (164,201) | (204,161)
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Derivative liabilities netting | 314,148 | 303,740
Fair Value, Recurring [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 24,223 |
Derivative assets netting | 0 |
Derivative liabilities |  |
Interest-rate contracts | (25,455) | (145,524)
Derivative liabilities netting | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 14,226 | 22,019
Derivative liabilities |  |
Derivative liability, fair value, gross | (104,080) | (67,226)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 14,226 | 22,019
Derivative liabilities |  |
Derivative liability, fair value, gross | (104,080) | (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 | 154,669 | 172,833
Derivative liabilities |  |
Derivative liability, fair value, gross | (105,598) | (258,446)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 130,446 | 172,833
Derivative liabilities |  |
Derivative liability, fair value, gross | (80,143) | (112,922)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contracts |  |
Derivative assets |  |
Interest-rate contracts | 24,223 |
Derivative liabilities |  |
Interest-rate contracts | (25,455) | (145,524)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 19,529 | 9,309
Derivative liabilities |  |
Derivative liability, fair value, gross | (129,925) | (123,592)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 19,529 | 9,309
Derivative liabilities |  |
Derivative liability, fair value, gross | (129,925) | (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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