v3.26.3
Fair Value Measurements - Changes in balances of Level 3 financial assets carried at fair value (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance $ 974 $ 1,062 $ 1,008 $ 1,096
Total realized/unrealized gains (losses) included in net earnings (loss) (5) 14 (33) 31
Total realized/unrealized gains (losses) included in other comprehensive income (loss) (8) 2 (16) 12
Purchases and issuances 65 34 158 109
Sales and settlements (29) (98) (153) (193)
Transfer into Level 3 3 2 44 15
Transfer out of Level 3 (3) (12) (11) (66)
Financial assets, Ending Balance 997 1,004 997 1,004
Fixed maturities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 702 752 712 768
Total realized/unrealized gains (losses) included in net earnings (loss) (3) 14 (18) 15
Total realized/unrealized gains (losses) included in other comprehensive income (loss) (8) 2 (16) 12
Purchases and issuances 59 25 145 80
Sales and settlements (27) (98) (138) (179)
Transfer into Level 3 3 2 44 8
Transfer out of Level 3 (3) (12) (6) (19)
Financial assets, Ending Balance 723 685 723 685
State and municipal        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 2 6 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 0 (1) (1) (1)
Transfer into Level 3 3 0 5 5
Transfer out of Level 3 0 0 (3) 0
Financial assets, Ending Balance 5 5 5 5
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 (1) 0 (1) 0
Transfer into Level 3 0 2 0 2
Transfer out of Level 3 0 0 0 0
Financial assets, Ending Balance 2 3 2 3
Other asset-backed securities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 317 284 310 296
Total realized/unrealized gains (losses) included in net earnings (loss) (3) 1 (10) 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) (4) (1) (12) 4
Purchases and issuances 53 8 97 24
Sales and settlements (5) (15) (54) (48)
Transfer into Level 3 0 0 27 0
Transfer out of Level 3 (3) 0 (3) 0
Financial assets, Ending Balance 355 277 355 277
Corporate and other        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 380 461 395 470
Total realized/unrealized gains (losses) included in net earnings (loss) 0 13 (8) 14
Total realized/unrealized gains (losses) included in other comprehensive income (loss) (4) 3 (4) 8
Purchases and issuances 6 17 48 56
Sales and settlements (21) (82) (82) (130)
Transfer into Level 3 0 0 12 1
Transfer out of Level 3 0 (12) 0 (19)
Financial assets, Ending Balance 361 400 361 400
Trading fixed maturities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 11 13 25 26
Total realized/unrealized gains (losses) included in net earnings (loss) 0 1 1 2
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 (2) 0 (15) (14)
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 (2) 0
Financial assets, Ending Balance 9 14 9 14
Equity securities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 247 286 256 292
Total realized/unrealized gains (losses) included in net earnings (loss) (1) 1 (13) 19
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances 3 4 9 20
Sales and settlements 0 0 0 0
Transfer into Level 3 0 0 0 7
Transfer out of Level 3 0 0 (3) (47)
Financial assets, Ending Balance 249 291 249 291
Assets of MIE        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 14 11 15 10
Total realized/unrealized gains (losses) included in net earnings (loss) (1) (2) (3) (5)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances 3 5 4 9
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 $ 16 $ 14 $ 16 $ 14