v3.26.1
Fair Value Measurements - Changes in balances of Level 3 financial assets carried at fair value (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance $ 1,015 $ 1,070 $ 1,008 $ 1,096
Total realized/unrealized gains (losses) included in net earnings (loss) (10) 25 (28) 17
Total realized/unrealized gains (losses) included in other comprehensive income (loss) (8) 4 (8) 10
Purchases and issuances 45 35 93 75
Sales and settlements (64) (40) (124) (95)
Transfer into Level 3 4 9 41 13
Transfer out of Level 3 (8) (41) (8) (54)
Financial assets, Ending Balance 974 1,062 974 1,062
Fixed maturities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 745 748 712 768
Total realized/unrealized gains (losses) included in net earnings (loss) (11) 7 (15) 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) (8) 4 (8) 10
Purchases and issuances 39 31 86 55
Sales and settlements (64) (40) (111) (81)
Transfer into Level 3 4 2 41 6
Transfer out of Level 3 (3) 0 (3) (7)
Financial assets, Ending Balance 702 752 702 752
State and municipal        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 6 4 4 1
Total realized/unrealized gains (losses) included in net earnings (loss) 0 0 0 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances 0 0 0 0
Sales and settlements (1) 0 (1) 0
Transfer into Level 3 0 2 2 5
Transfer out of Level 3 (3) 0 (3) 0
Financial assets, Ending Balance 2 6 2 6
Residential MBS        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 3 1 3 1
Total realized/unrealized gains (losses) included in net earnings (loss) 0 0 0 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances 0 0 0 0
Sales and settlements 0 0 0 0
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial assets, Ending Balance 3 1 3 1
Other asset-backed securities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 356 281 310 296
Total realized/unrealized gains (losses) included in net earnings (loss) (7) 0 (7) 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) (8) 3 (8) 5
Purchases and issuances 15 6 44 16
Sales and settlements (39) (6) (49) (33)
Transfer into Level 3 0 0 27 0
Transfer out of Level 3 0 0 0 0
Financial assets, Ending Balance 317 284 317 284
Corporate and other        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 380 462 395 470
Total realized/unrealized gains (losses) included in net earnings (loss) (4) 7 (8) 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 1 0 5
Purchases and issuances 24 25 42 39
Sales and settlements (24) (34) (61) (48)
Transfer into Level 3 4 0 12 1
Transfer out of Level 3 0 0 0 (7)
Financial assets, Ending Balance 380 461 380 461
Trading fixed maturities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 13 13 25 26
Total realized/unrealized gains (losses) included in net earnings (loss) 0 0 1 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances 0 0 0 0
Sales and settlements 0 0 (13) (14)
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 (2) 0 (2) 0
Financial assets, Ending Balance 11 13 11 13
Equity securities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 242 297 256 292
Total realized/unrealized gains (losses) included in net earnings (loss) 2 20 (12) 18
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances 6 3 6 16
Sales and settlements 0 0 0 0
Transfer into Level 3 0 7 0 7
Transfer out of Level 3 (3) (41) (3) (47)
Financial assets, Ending Balance 247 286 247 286
Assets of MIE        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 15 12 15 10
Total realized/unrealized gains (losses) included in net earnings (loss) (1) (2) (2) (3)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances 0 1 1 4
Sales and settlements 0 0 0 0
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial assets, Ending Balance $ 14 $ 11 $ 14 $ 11