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Fair Value Measurements - Changes in balances of Level 3 financial assets carried at fair value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Financial assets, beginning balance $ 1,096 $ 1,230 $ 1,102
Total realized/unrealized gains (losses) included in Net earnings 11 76 7
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 17 9 11
Purchases and issuances 203 368 270
Sales and settlements (268) (189) (109)
Transfer into Level 3 17 9 46
Transfer out of Level 3 (68) (407) (97)
Financial assets, ending balance $ 1,008 1,096 1,230
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Realized gains (losses) on securities    
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax    
Fixed maturities      
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Financial assets, beginning balance $ 768 736 664
Total realized/unrealized gains (losses) included in Net earnings 15 14 (4)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 17 14 11
Purchases and issuances 154 164 147
Sales and settlements (231) (132) (70)
Transfer into Level 3 10 9 46
Transfer out of Level 3 (21) (37) (58)
Financial assets, ending balance 712 768 736
State and municipal      
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Financial assets, beginning balance 1 2 5
Total realized/unrealized gains (losses) included in Net earnings 0 0 0
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0
Purchases and issuances 0 0 0
Sales and settlements (1) (1) (1)
Transfer into Level 3 5 0 1
Transfer out of Level 3 (1) 0 (3)
Financial assets, ending balance 4 1 2
Residential MBS      
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Financial assets, beginning balance 1 2 9
Total realized/unrealized gains (losses) included in Net earnings 0 0 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 (1)
Purchases and issuances 0 0 0
Sales and settlements 0 0 (3)
Transfer into Level 3 2 0 5
Transfer out of Level 3 0 (1) (9)
Financial assets, ending balance 3 1 2
Collateralized loan obligations      
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Financial assets, beginning balance 0 1 2
Total realized/unrealized gains (losses) included in Net earnings   (1) (2)
Total realized/unrealized gains (losses) included in other comprehensive income (loss)   0 1
Purchases and issuances   0 0
Sales and settlements   0 0
Transfer into Level 3   0 1
Transfer out of Level 3   0 (1)
Financial assets, ending balance   0 1
Other asset-backed securities      
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Financial assets, beginning balance 296 351 329
Total realized/unrealized gains (losses) included in Net earnings 0 (1) 1
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 9 8 6
Purchases and issuances 63 59 55
Sales and settlements (58) (100) (39)
Transfer into Level 3 0 5 31
Transfer out of Level 3 0 (26) (32)
Financial assets, ending balance 310 296 351
Corporate and other      
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Financial assets, beginning balance 470 380 319
Total realized/unrealized gains (losses) included in Net earnings 15 16 (4)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 8 6 5
Purchases and issuances 91 105 92
Sales and settlements (172) (31) (27)
Transfer into Level 3 3 4 8
Transfer out of Level 3 (20) (10) (13)
Financial assets, ending balance 395 470 380
Trading fixed maturities      
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Financial assets, beginning balance 26 0  
Total realized/unrealized gains (losses) included in Net earnings 2 2  
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0  
Purchases and issuances 11 24  
Sales and settlements (14) 0  
Transfer into Level 3 0 0  
Transfer out of Level 3 0 0  
Financial assets, ending balance 25 26 0
Equity securities      
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Financial assets, beginning balance 292 485 427
Total realized/unrealized gains (losses) included in Net earnings (1) 60 15
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 0 0
Purchases and issuances 28 174 121
Sales and settlements (23) (57) (39)
Transfer into Level 3 7 0 0
Transfer out of Level 3 (47) (370) (39)
Financial assets, ending balance 256 292 485
Assets of MIE      
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Financial assets, beginning balance 10 9 11
Total realized/unrealized gains (losses) included in Net earnings (5) 0 (4)
Total realized/unrealized gains (losses) included in other comprehensive income (loss) 0 (5) 0
Purchases and issuances 10 6 2
Sales and settlements 0 0 0
Transfer into Level 3 0 0 0
Transfer out of Level 3 0 0 0
Financial assets, ending balance $ 15 $ 10 $ 9