v3.26.1
Fair Value of Financial Instruments - Schedule of Assets Measured at Fair Value on Recurring Basis and Utilized Significant Unobservable (Level 3) Inputs to Determine Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 3,175 $ 2,881
Total realized and unrealized gains (losses), Included in net income (1) (5)
Total realized and unrealized gains (losses), Included in OCI (42) 36
Purchases 78 113
Sales 0 (1)
Issuances 0 0
Settlements (44) (69)
Transfer into Level 3 20 45
Transfer out of Level 3 (56) (32)
Ending balance 3,130 2,968
Total gains (losses) included in net income attributable to assets still held, Included in net income (1) (5)
Total gains (losses) included in OCI attributable to assets still held, Included in OCI $ (42) $ 35
Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain (Loss) Statement Of Other Comprehensive Income Extensible List Not Disclosed Flag Includedin OCI Includedin OCI
Other invested assets:    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 47 $ 25
Total realized and unrealized gains (losses), Included in net income (3) (4)
Total realized and unrealized gains (losses), Included in OCI (2) 13
Purchases 3 3
Sales 0 0
Issuances 0 0
Settlements (6) (6)
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 39 31
Total gains (losses) included in net income attributable to assets still held, Included in net income (3) (4)
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (2) 13
Other invested assets: | Derivative assets:    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 24 25
Total realized and unrealized gains (losses), Included in net income (3) (4)
Total realized and unrealized gains (losses), Included in OCI (2) 13
Purchases 3 3
Sales 0 0
Issuances 0 0
Settlements (6) (6)
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 16 31
Total gains (losses) included in net income attributable to assets still held, Included in net income (3) (4)
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (2) 13
Other invested assets: | Derivative assets: | Equity index options    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 18 19
Total realized and unrealized gains (losses), Included in net income (3) (4)
Total realized and unrealized gains (losses), Included in OCI 0 0
Purchases 3 3
Sales 0 0
Issuances 0 0
Settlements (6) (6)
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 12 12
Total gains (losses) included in net income attributable to assets still held, Included in net income (3) (4)
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 0
Other invested assets: | Derivative assets: | Forward bond purchase commitments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 6 6
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (2) 13
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 4 19
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (2) 13
Fixed maturity securities:    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 3,071 2,793
Total realized and unrealized gains (losses), Included in net income 1 0
Total realized and unrealized gains (losses), Included in OCI (40) 23
Purchases 65 110
Sales 0 0
Issuances 0 0
Settlements (38) (63)
Transfer into Level 3 20 45
Transfer out of Level 3 (56) (32)
Ending balance 3,023 2,876
Total gains (losses) included in net income attributable to assets still held, Included in net income 1 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (40) 22
Fixed maturity securities: | Non-U.S. government    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 16 13
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (1) 1
Purchases 0 1
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 15 15
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (1) 1
Fixed maturity securities: | U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,957 1,950
Total realized and unrealized gains (losses), Included in net income 1 0
Total realized and unrealized gains (losses), Included in OCI (33) 17
Purchases 32 49
Sales 0 0
Issuances 0 0
Settlements (24) (50)
Transfer into Level 3 0 5
Transfer out of Level 3 (45) (32)
Ending balance 1,888 1,939
Total gains (losses) included in net income attributable to assets still held, Included in net income 1 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (30) 16
Fixed maturity securities: | U.S. corporate | Utilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1,004 845
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (18) 4
Purchases 29 16
Sales 0 0
Issuances 0 0
Settlements 0 (3)
Transfer into Level 3 0 0
Transfer out of Level 3 (22) 0
Ending balance 993 862
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (17) 4
Fixed maturity securities: | U.S. corporate | Energy    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 21 21
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 21 21
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 0
Fixed maturity securities: | U.S. corporate | Finance and insurance    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 619 688
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (10) 9
Purchases 3 25
Sales 0 0
Issuances 0 0
Settlements (8) (23)
Transfer into Level 3 0 0
Transfer out of Level 3 0 (32)
Ending balance 604 667
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (10) 8
Fixed maturity securities: | U.S. corporate | Consumer—non-cyclical    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 35 63
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI 0 1
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (1) (15)
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 34 49
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 1
Fixed maturity securities: | U.S. corporate | Technology and communications    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 18 12
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (1) 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (7) 0
Transfer into Level 3 0 5
Transfer out of Level 3 0 0
Ending balance 10 17
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 0
Fixed maturity securities: | U.S. corporate | Industrial    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 16 15
Total realized and unrealized gains (losses), Included in net income 1 0
Total realized and unrealized gains (losses), Included in OCI 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 17 15
Total gains (losses) included in net income attributable to assets still held, Included in net income 1 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 0
Fixed maturity securities: | U.S. corporate | Capital goods    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 37 43
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (1) 1
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 36 44
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (1) 1
Fixed maturity securities: | U.S. corporate | Consumer—cyclical    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 55 99
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (1) 2
Purchases 0 8
Sales 0 0
Issuances 0 0
Settlements (2) (2)
Transfer into Level 3 0 0
Transfer out of Level 3 (10) 0
Ending balance 42 107
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 2
Fixed maturity securities: | U.S. corporate | Transportation    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 27 31
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (1) (2)
Transfer into Level 3 0 0
Transfer out of Level 3 (13) 0
Ending balance 13 29
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 0
Fixed maturity securities: | U.S. corporate | Other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 125 133
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (2) 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (5) (5)
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 118 128
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (2) 0
Fixed maturity securities: | Non-U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 749 675
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (6) 5
Purchases 4 12
Sales 0 0
Issuances 0 0
Settlements (10) (8)
Transfer into Level 3 0 40
Transfer out of Level 3 0 0
Ending balance 737 724
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (9) 5
Fixed maturity securities: | Non-U.S. corporate | Utilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 237 282
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI 0 3
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (10) 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 227 285
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (3) 3
Fixed maturity securities: | Non-U.S. corporate | Energy    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 107 116
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (1) (1)
Purchases 2 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 108 115
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (1) (1)
Fixed maturity securities: | Non-U.S. corporate | Finance and insurance    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 22 21
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 22 21
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 0
Fixed maturity securities: | Non-U.S. corporate | Consumer—non-cyclical    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 16 39
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI 0 0
Purchases 1 0
Sales 0 0
Issuances 0 0
Settlements 0 (8)
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 17 31
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 0
Fixed maturity securities: | Non-U.S. corporate | Technology and communications    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 9 17
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 9 17
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 0
Fixed maturity securities: | Non-U.S. corporate | Industrial    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 116 67
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (2) 2
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 40
Transfer out of Level 3 0 0
Ending balance 114 109
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (2) 2
Fixed maturity securities: | Non-U.S. corporate | Capital goods    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 64 47
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (1) 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 63 47
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (1) 0
Fixed maturity securities: | Non-U.S. corporate | Consumer—cyclical    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 24  
Total realized and unrealized gains (losses), Included in net income 0  
Total realized and unrealized gains (losses), Included in OCI 0  
Purchases 1  
Sales 0  
Issuances 0  
Settlements 0  
Transfer into Level 3 0  
Transfer out of Level 3 0  
Ending balance 25  
Total gains (losses) included in net income attributable to assets still held, Included in net income 0  
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0  
Fixed maturity securities: | Non-U.S. corporate | Transportation    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 79 35
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (1) 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 78 35
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (1) 0
Fixed maturity securities: | Non-U.S. corporate | Other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 75 51
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (1) 1
Purchases 0 12
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 74 64
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (1) 1
Fixed maturity securities: | Residential mortgage-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 3 2
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 (1) 0
Ending balance 2 2
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 0
Fixed maturity securities: | Commercial mortgage-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 19 11
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI 1 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 20 11
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 1 0
Fixed maturity securities: | Other asset-backed    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 327 142
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI (1) 0
Purchases 29 48
Sales 0 0
Issuances 0 0
Settlements (4) (5)
Transfer into Level 3 20 0
Transfer out of Level 3 (10) 0
Ending balance 361 185
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI (1) 0
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 41 44
Total realized and unrealized gains (losses), Included in net income 0 0
Total realized and unrealized gains (losses), Included in OCI 0 0
Purchases 7 0
Sales 0 (1)
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 48 43
Total gains (losses) included in net income attributable to assets still held, Included in net income 0 0
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 0
Limited partnerships    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 16 19
Total realized and unrealized gains (losses), Included in net income 1 (1)
Total realized and unrealized gains (losses), Included in OCI 0 0
Purchases 3 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Ending balance 20 18
Total gains (losses) included in net income attributable to assets still held, Included in net income 1 (1)
Total gains (losses) included in OCI attributable to assets still held, Included in OCI 0 $ 0
Short-term investments | Other invested assets:    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 23  
Total realized and unrealized gains (losses), Included in net income 0  
Total realized and unrealized gains (losses), Included in OCI 0  
Purchases 0  
Sales 0  
Issuances 0  
Settlements 0  
Transfer into Level 3 0  
Transfer out of Level 3 0  
Ending balance 23  
Total gains (losses) included in net income attributable to assets still held, Included in net income 0  
Total gains (losses) included in OCI attributable to assets still held, Included in OCI $ 0