XML 128 R51.htm IDEA: XBRL DOCUMENT v3.20.4
FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
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 63,100 8,800
Cash posted - offsetting derivative net liability positions under master-netting arrangements 35,100  
Cash posted - remaining in excess of derivative net liability positions included in consolidated Balance Sheets 28,000  
Long-term Debt, Fair Value 16,300,000 13,800,000
Long-term Debt 14,200,000 12,500,000
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member]    
Derivative assets    
Derivative asset, fair value, gross 110,498 67,030
Derivative Liabilities    
Derivative liability, fair value, gross (349,018) (231,537)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Financial contracts    
Derivative assets    
Derivative asset, fair value, gross 110,498 66,449
Derivative Liabilities    
Derivative liability, fair value, gross (145,611) (29,596)
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member] | Interest Rate Contracts    
Derivative assets    
Interest-rate contracts   581
Derivative Liabilities    
Interest-rate contracts (203,407) (201,941)
Fair Value, Recurring [Member]    
Derivative assets    
Derivative assets 0 38,442
Derivative assets netting (110,498) (28,588)
Derivative Liabilities    
Derivative liabilities (203,407) (202,949)
Derivative liabilities netting 145,611 28,588
Fair Value, Recurring [Member] | Financial contracts    
Derivative assets    
Derivative assets 0 37,861
Derivative assets netting (110,498) (28,588)
Derivative Liabilities    
Derivative liabilities 0 (1,008)
Derivative liabilities netting 145,611 28,588
Fair Value, Recurring [Member] | Interest Rate Contracts    
Derivative assets    
Interest-rate contracts   581
Derivative assets netting   0
Derivative Liabilities    
Interest-rate contracts (203,407) (201,941)
Derivative liabilities netting 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivative assets    
Derivative asset, fair value, gross 6,697 10,892
Derivative Liabilities    
Derivative liability, fair value, gross (10,489) (4,811)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Financial contracts    
Derivative assets    
Derivative asset, fair value, gross 6,697 10,892
Derivative Liabilities    
Derivative liability, fair value, gross (10,489) (4,811)
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 0 581
Derivative Liabilities    
Derivative liability, fair value, gross (203,407) (201,941)
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   581
Derivative Liabilities    
Interest-rate contracts (203,407) (201,941)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivative assets    
Derivative asset, fair value, gross 103,801 55,557
Derivative Liabilities    
Derivative liability, fair value, gross (135,122) (24,785)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Financial contracts    
Derivative assets    
Derivative asset, fair value, gross 103,801 55,557
Derivative Liabilities    
Derivative liability, fair value, gross (135,122) (24,785)
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