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CAPITAL STOCK - Schedule of Preferred Stock (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Class of Stock [Line Items]    
Shares authorized (in shares) 63,500,000 85,150,000
Shares issued (in shares) 63,500,000 63,500,000
Shares outstanding (in shares) 63,500,000 63,500,000
Carrying Value $ 1,536,569 $ 1,536,569
Series D    
Class of Stock [Line Items]    
Shares authorized (in shares) 0 18,400,000
Shares issued (in shares) 0 0
Shares outstanding (in shares) 0 0
Carrying Value $ 0 $ 0
Contractual Rate 7.50% 7.50%
Series F    
Class of Stock [Line Items]    
Shares authorized (in shares) 28,800,000 28,800,000
Shares issued (in shares) 28,800,000 28,800,000
Shares outstanding (in shares) 28,800,000 28,800,000
Carrying Value $ 696,910 $ 696,910
Contractual Rate 6.95%  
Floating Annual Rate 4.993%  
Series G    
Class of Stock [Line Items]    
Shares authorized (in shares) 17,000,000 19,550,000
Shares issued (in shares) 17,000,000 17,000,000
Shares outstanding (in shares) 17,000,000 17,000,000
Carrying Value $ 411,335 $ 411,335
Contractual Rate 6.50%  
Floating Annual Rate 4.172%  
Series I    
Class of Stock [Line Items]    
Shares authorized (in shares) 17,700,000 18,400,000
Shares issued (in shares) 17,700,000 17,700,000
Shares outstanding (in shares) 17,700,000 17,700,000
Carrying Value $ 428,324 $ 428,324
Contractual Rate 6.75%  
Floating Annual Rate 4.989%