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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