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BORROWINGS OF LONG-TERM AND OTHER DEBT - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended
Mar. 10, 2025
Aug. 31, 2025
Jun. 30, 2025
Jan. 31, 2024
Sep. 30, 2025
Mar. 31, 2025
Jan. 31, 2025
Dec. 31, 2024
Oct. 31, 2024
Dec. 22, 2023
Jun. 30, 2023
Sep. 30, 2020
Convertible Debt                        
Debt Instrument [Line Items]                        
Debt amount issued         $ 3,000,000 $ 7,000,000            
Interest Rates         4.25%              
Repurchase amount         $ 5,000,000 11,000,000            
Additional paid-in capital related to the induced conversion premium         2,000,000 2,000,000            
Long-term and other debt         100,000     $ 10,000,000        
Convertible Debt | Other Non-interest Expense                        
Debt Instrument [Line Items]                        
Debt instrument, inducement expense         1,000,000 $ 2,000,000            
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity                 $ 700,000,000      
Remaining borrowing capacity         700,000,000              
Subordinated notes due 2035 | Long-term and Other Debt                        
Debt Instrument [Line Items]                        
Debt amount issued         $ 400,000,000              
Interest Rates         8.375%              
Subordinated notes due 2035 | Subordinated Debt                        
Debt Instrument [Line Items]                        
Interest Rates         8.38%              
Repurchase amount         $ 100,000              
Long-term and other debt         $ 400,000,000     0        
7.000% Senior Notes Due 2028 | Convertible Debt                        
Debt Instrument [Line Items]                        
Interest Rates         7.00%              
Repurchase amount         $ 100,000,000              
4.250% Convertible Senior Notes Due 2028 | Convertible Debt                        
Debt Instrument [Line Items]                        
Debt amount issued                     $ 316,000,000  
Interest Rates         4.25%           4.25%  
Repurchase amount         $ 10,000,000              
Senior notes due 2029 | Senior Notes                        
Debt Instrument [Line Items]                        
Debt amount issued       $ 900,000,000           $ 600,000,000    
Interest Rates     9.75% 9.75% 9.75%              
Repurchase amount   $ 31,000,000 $ 150,000,000   $ 31,000,000              
Long-term and other debt         $ 719,000,000     900,000,000        
Redemption price       101.00%                
Principal amount per note   1,000 1,000                  
Repurchase amount per note including accrued unpaid interest   1,070 1,071                  
Loss on extinguishment of debt   $ 3,000,000 $ 13,000,000                  
Senior Notes 2029, January 2024 Issuance | Senior Notes                        
Debt Instrument [Line Items]                        
Debt amount issued       $ 300,000,000                
Senior notes due 2026 | Senior Notes                        
Debt Instrument [Line Items]                        
Debt amount issued                       $ 500,000,000
Interest Rates         7.00%             7.00%
Repurchase amount       $ 400,000,000     $ 100,000,000          
Long-term and other debt         $ 0     $ 100,000,000        
Subordinated Note Due 2035 | Subordinated Debt                        
Debt Instrument [Line Items]                        
Debt amount issued $ 400,000,000                      
Interest Rates 8.375%                      
Repurchase amount $ 100,000                      
Basis spread 4.30%