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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