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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Corporate bonds and other        
Reconciliations for All Assets and Liabilities [Roll Forward]        
Balance at beginning of period $ 1,129 $ 971 $ 1,045 $ 810
Included in Net Income
Included in OCI 59 (36) 39 (27)
Purchases 83 29 229 178
Sales (10) (10)
Settlements (24) (19) (77) (27)
Transfers into Level 3 11 11
Transfers out of Level 3
Balance at ending of period 1,237 945 1,237 945
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 57 (36) 34 (27)
States, municipalities and political subdivisions        
Reconciliations for All Assets and Liabilities [Roll Forward]        
Balance at beginning of period 43 43 44 43
Included in Net Income
Included in OCI 2 (2) 1 (2)
Purchases
Sales
Settlements
Transfers into Level 3
Transfers out of Level 3
Balance at ending of period 45 41 45 41
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 (2) 1 (2)
Asset-backed        
Reconciliations for All Assets and Liabilities [Roll Forward]        
Balance at beginning of period 887 883 901 788
Included in Net Income 1 1 5 10
Included in OCI 30 (28) 14 (28)
Purchases 38 61 111 203
Sales (14)
Settlements (23) (13) (65) (39)
Transfers into Level 3 23
Transfers out of Level 3 (18) (7) (37) (60)
Balance at ending of period 915 897 915 897
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 30 (28) 14 (28)
Fixed maturities available-for-sale        
Reconciliations for All Assets and Liabilities [Roll Forward]        
Balance at beginning of period 2,059 1,897 1,990 1,641
Included in Net Income 1 1 5 10
Included in OCI 91 (66) 54 (57)
Purchases 121 90 340 381
Sales (10) 0 (24) 0
Settlements (47) (32) (142) (66)
Transfers into Level 3 0 0 11 34
Transfers out of Level 3 (18) (7) (37) (60)
Balance at ending of period 2,197 1,883 2,197 1,883
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held 0 0 0 0
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held 89 (66) 49 (57)
Equity securities        
Reconciliations for All Assets and Liabilities [Roll Forward]        
Balance at beginning of period 14 26 24 35
Included in Net Income (1) 6 (8)
Included in OCI
Purchases 3
Sales (2) (19) (4)
Settlements
Transfers into Level 3
Transfers out of Level 3
Balance at ending of period 14 23 14 23
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held (1) 2 (8)
Unrealized Gains (Losses) Recognized in Other Comprehensive Income (Loss) on Level 3 Assets and Liabilities Held