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Fair Value Measurements - Assets and liabilities measured and carried at fair value in the financial statements (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Available for sale (AFS) fixed maturities $ 10,518 $ 10,398
Trading fixed maturities 80 76
Equity securities 800 751
Assets of managed investment entities 3,972 4,140
Other assets 55 82
Total assets accounted for at fair value 15,374 15,366
Liabilities:    
Liabilities of managed investment entities 3,834 3,965
Derivative liability 5 18
Total liabilities accounted for at fair value 3,840 3,985
Contingent consideration — acquisitions    
Liabilities:    
Fair value of potential contingent consideration 1 2
Other liabilities — derivatives    
Liabilities:    
Derivative liability 5 18
Fixed maturities    
Assets:    
Available for sale (AFS) fixed maturities 10,518 10,398
Trading fixed maturities 80 76
U.S. government and government agencies    
Assets:    
Available for sale (AFS) fixed maturities 170 173
States, municipalities and political subdivisions    
Assets:    
Available for sale (AFS) fixed maturities 853 859
Foreign government    
Assets:    
Available for sale (AFS) fixed maturities 253 237
Residential MBS    
Assets:    
Available for sale (AFS) fixed maturities 2,311 1,989
Collateralized loan obligations    
Assets:    
Available for sale (AFS) fixed maturities 1,100 1,237
Other asset-backed securities    
Assets:    
Available for sale (AFS) fixed maturities 2,403 2,407
Corporate and other    
Assets:    
Available for sale (AFS) fixed maturities 3,428 3,496
Equity securities    
Assets:    
Equity securities 800 751
Other assets    
Assets:    
Other assets 4 1
Level 1    
Assets:    
Assets of managed investment entities 269 419
Total assets accounted for at fair value 896 1,023
Liabilities:    
Liabilities of managed investment entities 260 402
Total liabilities accounted for at fair value 260 402
Level 1 | Contingent consideration — acquisitions    
Liabilities:    
Fair value of potential contingent consideration 0 0
Level 1 | Other liabilities — derivatives    
Liabilities:    
Derivative liability 0 0
Level 1 | Fixed maturities    
Assets:    
Available for sale (AFS) fixed maturities 168 185
Trading fixed maturities 0 0
Level 1 | U.S. government and government agencies    
Assets:    
Available for sale (AFS) fixed maturities 167 173
Level 1 | States, municipalities and political subdivisions    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 1 | Foreign government    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 1 | Residential MBS    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 1 | Collateralized loan obligations    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 1 | Other asset-backed securities    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 1 | Corporate and other    
Assets:    
Available for sale (AFS) fixed maturities 1 12
Level 1 | Equity securities    
Assets:    
Equity securities 459 419
Level 1 | Other assets    
Assets:    
Other assets 0 0
Level 2    
Assets:    
Assets of managed investment entities 3,689 3,711
Total assets accounted for at fair value 13,474 13,247
Liabilities:    
Liabilities of managed investment entities 3,561 3,553
Total liabilities accounted for at fair value 3,566 3,571
Level 2 | Contingent consideration — acquisitions    
Liabilities:    
Fair value of potential contingent consideration 0 0
Level 2 | Other liabilities — derivatives    
Liabilities:    
Derivative liability 5 18
Level 2 | Fixed maturities    
Assets:    
Available for sale (AFS) fixed maturities 9,665 9,445
Trading fixed maturities 66 50
Level 2 | U.S. government and government agencies    
Assets:    
Available for sale (AFS) fixed maturities 3 0
Level 2 | States, municipalities and political subdivisions    
Assets:    
Available for sale (AFS) fixed maturities 848 858
Level 2 | Foreign government    
Assets:    
Available for sale (AFS) fixed maturities 253 237
Level 2 | Residential MBS    
Assets:    
Available for sale (AFS) fixed maturities 2,308 1,988
Level 2 | Collateralized loan obligations    
Assets:    
Available for sale (AFS) fixed maturities 1,100 1,237
Level 2 | Other asset-backed securities    
Assets:    
Available for sale (AFS) fixed maturities 2,126 2,111
Level 2 | Corporate and other    
Assets:    
Available for sale (AFS) fixed maturities 3,027 3,014
Level 2 | Equity securities    
Assets:    
Equity securities 50 40
Level 2 | Other assets    
Assets:    
Other assets 4 1
Level 3    
Assets:    
Assets of managed investment entities 14 10
Total assets accounted for at fair value 1,004 1,096
Liabilities:    
Liabilities of managed investment entities 13 10
Total liabilities accounted for at fair value 14 12
Level 3 | Contingent consideration — acquisitions    
Liabilities:    
Fair value of potential contingent consideration 1 2
Level 3 | Other liabilities — derivatives    
Liabilities:    
Derivative liability 0 0
Level 3 | Fixed maturities    
Assets:    
Available for sale (AFS) fixed maturities 685 768
Trading fixed maturities 14 26
Level 3 | U.S. government and government agencies    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 3 | States, municipalities and political subdivisions    
Assets:    
Available for sale (AFS) fixed maturities 5 1
Level 3 | Foreign government    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 3 | Residential MBS    
Assets:    
Available for sale (AFS) fixed maturities 3 1
Level 3 | Collateralized loan obligations    
Assets:    
Available for sale (AFS) fixed maturities 0 0
Level 3 | Other asset-backed securities    
Assets:    
Available for sale (AFS) fixed maturities 277 296
Level 3 | Corporate and other    
Assets:    
Available for sale (AFS) fixed maturities 400 470
Level 3 | Equity securities    
Assets:    
Equity securities 291 292
Level 3 | Other assets    
Assets:    
Other assets $ 0 $ 0