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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($)
$ in Thousands
Mar. 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 108,000 63,100
Cash posted - offsetting derivative net liability positions under master-netting arrangements 54,400 35,100
Cash posted - remaining in excess of derivative net liability positions included in consolidated Balance Sheets 53,600 28,000
Long-term debt, fair value 15,800,000 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 120,397 110,498
Derivative liabilities    
Derivative liability, fair value, gross (271,919) (349,018)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Financial Contracts    
Derivative assets    
Derivative asset, fair value, gross 120,156 110,498
Derivative liabilities    
Derivative liability, fair value, gross (174,556) (145,611)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Interest Rate Contracts    
Derivative assets    
Interest-rate contracts 241  
Derivative liabilities    
Interest-rate contracts (97,363) (203,407)
Fair Value, Recurring [Member]    
Derivative assets    
Derivative assets 241 0
Derivative assets netting (120,156) (110,498)
Derivative liabilities    
Derivative liabilities (97,363) (203,407)
Derivative liabilities netting 174,556 145,611
Fair Value, Recurring [Member] | Financial Contracts    
Derivative assets    
Derivative assets 0 0
Derivative assets netting (120,156) (110,498)
Derivative liabilities    
Derivative liabilities 0 0
Derivative liabilities netting 174,556 145,611
Fair Value, Recurring [Member] | Interest Rate Contracts    
Derivative assets    
Interest-rate contracts 241  
Derivative assets netting 0  
Derivative liabilities    
Interest-rate contracts (97,363) (203,407)
Derivative liabilities netting 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivative assets    
Derivative asset, fair value, gross 6,380 6,697
Derivative liabilities    
Derivative liability, fair value, gross (18,986) (10,489)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Contracts    
Derivative assets    
Derivative asset, fair value, gross 6,380 6,697
Derivative liabilities    
Derivative liability, fair value, gross (18,986) (10,489)
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 241 0
Derivative liabilities    
Derivative liability, fair value, gross (97,363) (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 assets    
Interest-rate contracts 241  
Derivative liabilities    
Interest-rate contracts (97,363) (203,407)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivative assets    
Derivative asset, fair value, gross 113,776 103,801
Derivative liabilities    
Derivative liability, fair value, gross (155,570) (135,122)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Contracts    
Derivative assets    
Derivative asset, fair value, gross 113,776 103,801
Derivative liabilities    
Derivative liability, fair value, gross (155,570) (135,122)
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