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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance $ 1,062 $ 1,382 $ 1,096 $ 1,230
Total realized/unrealized gains (losses) included in net earnings (loss) 14 23 31 54
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 2 14 12 19
Purchases and issuances 34 97 109 276
Sales and settlements (98) (53) (193) (85)
Transfer into Level 3 2 8 15 8
Transfer out of Level 3 (12) 0 (66) (31)
Financial assets, Ending Balance 1,004 1,471 1,004 1,471
Fixed maturities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 752 756 768 736
Total realized/unrealized gains (losses) included in net earnings (loss) 14 5 15 3
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 2 14 12 19
Purchases and issuances 25 42 80 114
Sales and settlements (98) (10) (179) (34)
Transfer into Level 3 2 8 8 8
Transfer out of Level 3 (12) 0 (19) (31)
Financial assets, Ending Balance 685 815 685 815
State and municipal        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 6 2 1 2
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 0 5 0
Transfer out of Level 3 0 0 0 0
Financial assets, Ending Balance 5 2 5 2
Residential MBS        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 1 2 1 2
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 2 0 2 0
Transfer out of Level 3 0 0 0 0
Financial assets, Ending Balance 3 2 3 2
Collateralized loan obligations        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 0 1 0 1
Total realized/unrealized gains (losses) included in net earnings (loss) 0 (1) 0 (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 0 0
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial assets, Ending Balance 0 0 0 0
Other asset-backed securities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 284 340 296 351
Total realized/unrealized gains (losses) included in net earnings (loss) 1 0 1 (1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) (1) 7 4 11
Purchases and issuances 8 16 24 40
Sales and settlements (15) (5) (48) (17)
Transfer into Level 3 0 5 0 5
Transfer out of Level 3 0 0 0 (26)
Financial assets, Ending Balance 277 363 277 363
Corporate and other        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 461 411 470 380
Total realized/unrealized gains (losses) included in net earnings (loss) 13 6 14 5
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 3 7 8 8
Purchases and issuances 17 26 56 74
Sales and settlements (82) (5) (130) (17)
Transfer into Level 3 0 3 1 3
Transfer out of Level 3 (12) 0 (19) (5)
Financial assets, Ending Balance 400 448 400 448
Trading fixed maturities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 13 12 26 0
Total realized/unrealized gains (losses) included in net earnings (loss) 1 1 2 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances 0 12 0 24
Sales and settlements 0 0 (14) 0
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 0 0 0 0
Financial assets, Ending Balance 14 25 14 25
Equity securities        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 286 602 292 485
Total realized/unrealized gains (losses) included in net earnings (loss) 1 18 19 53
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances 4 43 20 133
Sales and settlements 0 (43) 0 (51)
Transfer into Level 3 0 0 7 0
Transfer out of Level 3 0 0 (47) 0
Financial assets, Ending Balance 291 620 291 620
Assets of MIE        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Financial assets, Beginning Balance 11 12 10 9
Total realized/unrealized gains (losses) included in net earnings (loss) (2) (1) (5) (3)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases and issuances 5 0 9 5
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