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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