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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
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 | 157,000 | 63,100
Cash posted - offsetting derivative net liability positions under master-netting arrangements | 99,600 | 35,100
Cash posted - remaining in excess of derivative net liability positions included in consolidated Balance Sheets | 57,400 | 28,000
Long-term Debt, Fair Value | 15,600,000 | 16,300,000
Long-term Debt | 13,600,000 | 14,200,000
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 204,161 | 110,498
Derivative liabilities |  |
Derivative liability, fair value, gross | (449,264) | (349,018)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Financial contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 204,161 | 110,498
Derivative liabilities |  |
Derivative liability, fair value, gross | (303,740) | (145,611)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Interest Rate Contracts |  |
Derivative liabilities |  |
Interest-rate contracts | (145,524) | (203,407)
Fair Value, Recurring [Member] |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative assets netting | (204,161) | (110,498)
Derivative liabilities |  |
Derivative liabilities | (145,524) | (203,407)
Derivative liabilities netting | 303,740 | 145,611
Fair Value, Recurring [Member] | Financial contracts |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative assets netting | (204,161) | (110,498)
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Derivative liabilities netting | 303,740 | 145,611
Fair Value, Recurring [Member] | Interest Rate Contracts |  |
Derivative liabilities |  |
Interest-rate contracts | (145,524) | (203,407)
Derivative liabilities netting | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 22,019 | 6,697
Derivative liabilities |  |
Derivative liability, fair value, gross | (67,226) | (10,489)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Financial contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 22,019 | 6,697
Derivative liabilities |  |
Derivative liability, fair value, gross | (67,226) | (10,489)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contracts |  |
Derivative liabilities |  |
Interest-rate contracts | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 172,833 | 0
Derivative liabilities |  |
Derivative liability, fair value, gross | (258,446) | (203,407)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Financial contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 172,833 | 0
Derivative liabilities |  |
Derivative liability, fair value, gross | (112,922) | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contracts |  |
Derivative liabilities |  |
Interest-rate contracts | (145,524) | (203,407)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 9,309 | 103,801
Derivative liabilities |  |
Derivative liability, fair value, gross | (123,592) | (135,122)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Financial contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 9,309 | 103,801
Derivative liabilities |  |
Derivative liability, fair value, gross | (123,592) | (135,122)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contracts |  |
Derivative liabilities |  |
Interest-rate contracts | $ 0 | $ 0

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