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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
Mar. 31, 2026
Mar. 31, 2025
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Financial assets, Beginning Balance $ 1,008 $ 1,096
Total realized/unrealized gains (losses) included in net earnings (loss) (18) (8)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 6
Purchases and issuances 48 40
Sales and settlements (60) (55)
Transfer into Level 3 37 4
Transfer out of Level 3 0 (13)
Financial assets, Ending Balance 1,015 1,070
Fixed maturities    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Financial assets, Beginning Balance 712 768
Total realized/unrealized gains (losses) included in net earnings (loss) (4) (6)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 6
Purchases and issuances 47 24
Sales and settlements (47) (41)
Transfer into Level 3 37 4
Transfer out of Level 3 0 (7)
Financial assets, Ending Balance 745 748
State and municipal    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Financial assets, Beginning Balance 4 1
Total realized/unrealized gains (losses) included in net earnings (loss) 0 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases and issuances 0 0
Sales and settlements 0 0
Transfer into Level 3 2 3
Transfer out of Level 3 0 0
Financial assets, Ending Balance 6 4
Residential MBS    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Financial assets, Beginning Balance 3 1
Total realized/unrealized gains (losses) included in net earnings (loss) 0 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases and issuances 0 0
Sales and settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Financial assets, Ending Balance 3 1
Collateralized loan obligations    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Financial assets, Beginning Balance   0
Total realized/unrealized gains (losses) included in net earnings (loss)   0
Total realized/unrealized gains (losses) included in other comprehensive income (loss)   0
Purchases and issuances   0
Sales and settlements   0
Transfer into Level 3   0
Transfer out of Level 3   0
Financial assets, Ending Balance   0
Other asset-backed securities    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Financial assets, Beginning Balance 310 296
Total realized/unrealized gains (losses) included in net earnings (loss) 0 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 2
Purchases and issuances 29 10
Sales and settlements (10) (27)
Transfer into Level 3 27 0
Transfer out of Level 3 0 0
Financial assets, Ending Balance 356 281
Corporate and other    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Financial assets, Beginning Balance 395 470
Total realized/unrealized gains (losses) included in net earnings (loss) (4) (6)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 4
Purchases and issuances 18 14
Sales and settlements (37) (14)
Transfer into Level 3 8 1
Transfer out of Level 3 0 (7)
Financial assets, Ending Balance 380 462
Trading fixed maturities    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Financial assets, Beginning Balance 25 26
Total realized/unrealized gains (losses) included in net earnings (loss) 1 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases and issuances 0 0
Sales and settlements (13) (14)
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Financial assets, Ending Balance 13 13
Equity securities    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Financial assets, Beginning Balance 256 292
Total realized/unrealized gains (losses) included in net earnings (loss) (14) (2)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases and issuances 0 13
Sales and settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 (6)
Financial assets, Ending Balance 242 297
Assets of MIE    
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Financial assets, Beginning Balance 15 10
Total realized/unrealized gains (losses) included in net earnings (loss) (1) (1)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases and issuances 1 3
Sales and settlements 0 0
Transfer into Level 3 0 0
Transfer out of Level 3 0 0
Financial assets, Ending Balance $ 15 $ 12