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FAIR VALUE - Schedule of Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs by Asset Type (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Total gains or (losses) (realized/unrealized)        
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories $ 0   $ 0  
Market Value        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance of fixed maturities 2,312,000,000 $ 2,045,000,000 2,189,000,000 $ 1,993,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings (36,000,000) (6,000,000) (37,000,000) 0
Included in other comprehensive income (loss) $ 20,000,000 $ 7,000,000 $ 3,000,000 $ 16,000,000
Included in other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Purchases, issuances and settlements $ 99,000,000 $ 37,000,000 $ 239,000,000 $ 73,000,000
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 0 0 0
Ending balance of fixed maturities 2,394,000,000 2,082,000,000 2,394,000,000 2,082,000,000
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date (13,000,000) (7,000,000) (14,000,000) (3,000,000)
Corporate securities | Market Value        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance of fixed maturities 436,000,000 589,000,000 518,000,000 672,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings (23,000,000) (7,000,000) (24,000,000) (1,000,000)
Included in other comprehensive income (loss) 13,000,000 2,000,000 (1,000,000) 1,000,000
Purchases, issuances and settlements (25,000,000) (36,000,000) (92,000,000) (123,000,000)
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 0 0 0
Ending balance of fixed maturities 402,000,000 549,000,000 402,000,000 549,000,000
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date (13,000,000) (7,000,000) (14,000,000) (3,000,000)
Asset-backed securities | Market Value        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance of fixed maturities 1,862,000,000 1,442,000,000 1,657,000,000 1,305,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings (14,000,000) 0 (13,000,000) 0
Included in other comprehensive income (loss) 7,000,000 4,000,000 5,000,000 15,000,000
Purchases, issuances and settlements 124,000,000 73,000,000 331,000,000 199,000,000
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 0 0 0
Ending balance of fixed maturities 1,979,000,000 1,519,000,000 1,979,000,000 1,519,000,000
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date 0 0 0 0
Foreign corporate securities | Market Value        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance of fixed maturities 14,000,000 14,000,000 14,000,000 16,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings 0 0 0 1,000,000
Included in other comprehensive income (loss) 0 0 0 0
Purchases, issuances and settlements 0 0 0 (2,000,000)
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 0 0 0
Ending balance of fixed maturities 14,000,000 14,000,000 14,000,000 14,000,000
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date $ 0 $ 0 $ 0 $ 0