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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 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 2,234,000,000 $ 1,976,000,000 2,189,000,000 $ 1,993,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings (1,000,000) 5,000,000 (1,000,000) 6,000,000
Included in other comprehensive income (loss) $ (12,000,000) $ 2,000,000 $ (17,000,000) $ 9,000,000
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 $ 91,000,000 $ 62,000,000 $ 140,000,000 $ 37,000,000
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 0 0 0
Ending balance of fixed maturities 2,312,000,000 2,045,000,000 2,312,000,000 2,045,000,000
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 (2,000,000) 3,000,000 (2,000,000) 4,000,000
Corporate securities | Market Value        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance of fixed maturities 468,000,000 620,000,000 518,000,000 672,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings (1,000,000) 5,000,000 (1,000,000) 6,000,000
Included in other comprehensive income (loss) (8,000,000) (1,000,000) (15,000,000) (1,000,000)
Purchases, issuances and settlements (22,000,000) (35,000,000) (67,000,000) (88,000,000)
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 0 0 0
Ending balance of fixed maturities 436,000,000 589,000,000 436,000,000 589,000,000
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 (2,000,000) 3,000,000 (2,000,000) 4,000,000
Asset-backed securities | Market Value        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance of fixed maturities 1,752,000,000 1,340,000,000 1,657,000,000 1,305,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings 0 0 0 0
Included in other comprehensive income (loss) (3,000,000) 3,000,000 (2,000,000) 10,000,000
Purchases, issuances and settlements 114,000,000 99,000,000 207,000,000 126,000,000
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 0 0 0
Ending balance of fixed maturities 1,862,000,000 1,442,000,000 1,862,000,000 1,442,000,000
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 16,000,000 14,000,000 16,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings 0 0 0 0
Included in other comprehensive income (loss) 0 0 0 0
Purchases, issuances and settlements 0 (2,000,000) 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