v3.25.1
Fair Value - Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Corporate bonds and other    
Reconciliations for All Assets and Liabilities [Roll Forward]    
Balance at beginning of period $ 1,278 $ 1,045
Included in Net Income
Included in OCI 21 (12)
Purchases 55 74
Sales
Settlements (18) (36)
Transfers into Level 3 15 11
Transfers out of Level 3
Balance at ending of period 1,351 1,082
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held 21 (14)
States, municipalities and political subdivisions    
Reconciliations for All Assets and Liabilities [Roll Forward]    
Balance at beginning of period 42 44
Included in Net Income
Included in OCI 2 (1)
Purchases
Sales
Settlements
Transfers into Level 3
Transfers out of Level 3
Balance at ending of period 44 43
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held 2 (1)
Asset-backed    
Reconciliations for All Assets and Liabilities [Roll Forward]    
Balance at beginning of period 876 901
Included in Net Income 4 2
Included in OCI 1 (5)
Purchases 27 18
Sales (9)
Settlements (19) (17)
Transfers into Level 3
Transfers out of Level 3 (19)
Balance at ending of period 889 871
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held 1 (5)
Fixed maturities available-for-sale    
Reconciliations for All Assets and Liabilities [Roll Forward]    
Balance at beginning of period 2,196 1,990
Included in Net Income 4 2
Included in OCI 24 (18)
Purchases 82 92
Sales 0 (9)
Settlements (37) (53)
Transfers into Level 3 15 11
Transfers out of Level 3 0 (19)
Balance at ending of period 2,284 1,996
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held 0 0
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held 24 (20)
Equity securities    
Reconciliations for All Assets and Liabilities [Roll Forward]    
Balance at beginning of period 20 24
Included in Net Income 1 6
Included in OCI
Purchases
Sales (19)
Settlements (4)
Transfers into Level 3
Transfers out of Level 3
Balance at ending of period 17 11
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held (1) 1
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held