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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands | Sep. 30, 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 | 319,200 | 63,100
Cash posted - offsetting derivative net liability positions under master-netting arrangements | 289,400 | 35,100
Cash posted - remaining in excess of derivative net liability positions included in consolidated Balance Sheets | 29,800 | 28,000
Long-term debt, fair value | 16,500,000 | 16,300,000
Long-term debt | 14,200,000 | 14,200,000
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 509,785 | 110,498
Derivative liabilities |  |
Derivative liability, fair value, gross | (944,778) | (349,018)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 509,785 | 110,498
Derivative liabilities |  |
Derivative liability, fair value, gross | (799,187) | (145,611)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Interest Rate Contracts |  |
Derivative liabilities |  |
Interest-rate contracts | (145,591) | (203,407)
Fair Value, Recurring [Member] |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative assets netting | (509,785) | (110,498)
Derivative liabilities |  |
Derivative liabilities | (145,591) | (203,407)
Derivative liabilities netting | 799,187 | 145,611
Fair Value, Recurring [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative assets | 0 | 0
Derivative assets netting | (509,785) | (110,498)
Derivative liabilities |  |
Derivative liabilities | 0 | 0
Derivative liabilities netting | 799,187 | 145,611
Fair Value, Recurring [Member] | Interest Rate Contracts |  |
Derivative liabilities |  |
Interest-rate contracts | (145,591) | (203,407)
Derivative liabilities netting | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 78,930 | 6,697
Derivative liabilities |  |
Derivative liability, fair value, gross | (201,124) | (10,489)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 78,930 | 6,697
Derivative liabilities |  |
Derivative liability, fair value, gross | (201,124) | (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 | 0 | 0
Derivative liabilities |  |
Derivative liability, fair value, gross | (145,591) | (203,407)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 0 | 0
Derivative liabilities |  |
Derivative liability, fair value, gross | 0 | 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contracts |  |
Derivative liabilities |  |
Interest-rate contracts | (145,591) | (203,407)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Derivative assets |  |
Derivative asset, fair value, gross | 430,855 | 103,801
Derivative liabilities |  |
Derivative liability, fair value, gross | (598,063) | (135,122)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Contracts |  |
Derivative assets |  |
Derivative asset, fair value, gross | 430,855 | 103,801
Derivative liabilities |  |
Derivative liability, fair value, gross | (598,063) | (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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