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FAIR VALUE - Level 3 Activity (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
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 2,045,000,000 $ 1,842,000,000 1,993,000,000 $ 1,725,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings (6,000,000) 1,000,000 0 3,000,000
Included in other comprehensive income (loss) $ 7,000,000 $ (3,000,000) $ 16,000,000 $ 2,000,000
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 $ 37,000,000 $ 80,000,000 $ 73,000,000 $ 191,000,000
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 0 0 0
Ending balance of fixed maturities 2,082,000,000 1,921,000,000 2,082,000,000 1,921,000,000
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 (7,000,000) 0 (3,000,000) 1,000,000
Corporate Securities | Market Value        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance of fixed maturities 589,000,000 711,000,000 672,000,000 715,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings (7,000,000) 1,000,000 (1,000,000) 3,000,000
Included in other comprehensive income (loss) 2,000,000 0 1,000,000 (5,000,000)
Purchases, issuances and settlements (36,000,000) 12,000,000 (123,000,000) 12,000,000
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 0 0 0
Ending balance of fixed maturities 549,000,000 725,000,000 549,000,000 725,000,000
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 (7,000,000) 0 (3,000,000) 1,000,000
Asset-backed Securities | Market Value        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance of fixed maturities 1,442,000,000 1,115,000,000 1,305,000,000 994,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings 0 0 0 0
Included in other comprehensive income (loss) 4,000,000 (3,000,000) 15,000,000 7,000,000
Purchases, issuances and settlements 73,000,000 68,000,000 199,000,000 179,000,000
Transfers in/(out) of Level 3 and reclassification of securities in/(out) of investment categories 0 0 0 0
Ending balance of fixed maturities 1,519,000,000 1,180,000,000 1,519,000,000 1,180,000,000
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 16,000,000 16,000,000
Total gains or (losses) (realized/unrealized)        
Included in earnings 0 0 1,000,000 0
Included in other comprehensive income (loss) 0 0 0 0
Purchases, issuances and settlements 0 0 (2,000,000) 0
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 16,000,000 14,000,000 16,000,000
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