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FAIR VALUE - Schedule of Activity under Level 3, Fair Value Measurements using Significant Unobservable Inputs by Asset Type (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Total gains or (losses) (realized/unrealized)    
Transfer in and/or (out) of Level 3 $ 0 $ 0
Market Value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance fixed maturities 1,993,000,000 1,725,000,000
Total gains or (losses) (realized/unrealized)    
Included in earnings (or changes in net assets) 0 4,000,000
Included in other comprehensive income (loss) $ 13,000,000 $ 4,000,000
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Net increase (decrease) during the period Net increase (decrease) during the period
Purchases, issuances and settlements $ 183,000,000 $ 260,000,000
Transfer in and/or (out) of Level 3 0 0
Ending balance 2,189,000,000 1,993,000,000
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 (3,000,000) 9,000,000
Corporate Securities | Market Value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance fixed maturities 672,000,000 715,000,000
Total gains or (losses) (realized/unrealized)    
Included in earnings (or changes in net assets) (1,000,000) 4,000,000
Included in other comprehensive income (loss) 1,000,000 (2,000,000)
Purchases, issuances and settlements (154,000,000) (45,000,000)
Transfer in and/or (out) of Level 3 0 0
Ending balance 518,000,000 672,000,000
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 (3,000,000) 9,000,000
Asset-Backed Securities | Market Value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance fixed maturities 1,305,000,000 994,000,000
Total gains or (losses) (realized/unrealized)    
Included in earnings (or changes in net assets) 0 0
Included in other comprehensive income (loss) 12,000,000 6,000,000
Purchases, issuances and settlements 339,000,000 305,000,000
Transfer in and/or (out) of Level 3 0 0
Ending balance 1,657,000,000 1,305,000,000
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
Foreign Corporate | Market Value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance fixed maturities 16,000,000 16,000,000
Total gains or (losses) (realized/unrealized)    
Included in earnings (or changes in net assets) 1,000,000 0
Included in other comprehensive income (loss) 0 0
Purchases, issuances and settlements (2,000,000) 0
Transfer in and/or (out) of Level 3 0 0
Ending balance 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