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Fair Value Measurements - Assets and liabilities measured and carried at fair value in the financial statements (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Assets:    
Fair Value $ 11,397 $ 11,052
Trading fixed maturities 80 91
Fair Value 753 785
Assets of managed investment entities 3,987 4,050
Other assets — derivatives 47 54
Total assets accounted for at fair value 16,218 15,979
Liabilities:    
Liabilities of managed investment entities 3,854 3,907
Other liabilities — derivatives 11 3
Total liabilities accounted for at fair value 3,868 3,913
Contingent consideration — acquisitions    
Liabilities:    
Contingent consideration — acquisitions 3 3
Other liabilities — derivatives    
Liabilities:    
Other liabilities — derivatives 11 3
Fixed maturities    
Assets:    
Fair Value 11,397 11,052
Trading fixed maturities 80 91
U.S. government and government agencies    
Assets:    
Fair Value 150 161
States, municipalities and political subdivisions    
Assets:    
Fair Value 791 835
Foreign government    
Assets:    
Fair Value 237 238
Residential MBS    
Assets:    
Fair Value 3,160 2,747
Collateralized loan obligations    
Assets:    
Fair Value 1,180 1,160
Other asset-backed securities    
Assets:    
Fair Value 2,575 2,525
Corporate and other    
Assets:    
Fair Value 3,304 3,386
Equity securities    
Assets:    
Fair Value 753 785
Other assets    
Assets:    
Other assets — derivatives 1 1
Level 1    
Assets:    
Assets of managed investment entities 168 310
Total assets accounted for at fair value 776 946
Liabilities:    
Liabilities of managed investment entities 163 298
Total liabilities accounted for at fair value 163 298
Level 1 | Contingent consideration — acquisitions    
Liabilities:    
Contingent consideration — acquisitions 0 0
Level 1 | Other liabilities — derivatives    
Liabilities:    
Other liabilities — derivatives 0 0
Level 1 | Fixed maturities    
Assets:    
Fair Value 147 158
Trading fixed maturities 0 0
Level 1 | U.S. government and government agencies    
Assets:    
Fair Value 146 157
Level 1 | States, municipalities and political subdivisions    
Assets:    
Fair Value 0 0
Level 1 | Foreign government    
Assets:    
Fair Value 0 0
Level 1 | Residential MBS    
Assets:    
Fair Value 0 0
Level 1 | Collateralized loan obligations    
Assets:    
Fair Value 0 0
Level 1 | Other asset-backed securities    
Assets:    
Fair Value 0 0
Level 1 | Corporate and other    
Assets:    
Fair Value 1 1
Level 1 | Equity securities    
Assets:    
Fair Value 461 478
Level 1 | Other assets    
Assets:    
Other assets — derivatives 0 0
Level 2    
Assets:    
Assets of managed investment entities 3,804 3,725
Total assets accounted for at fair value 14,427 14,025
Liabilities:    
Liabilities of managed investment entities 3,676 3,594
Total liabilities accounted for at fair value 3,687 3,597
Level 2 | Contingent consideration — acquisitions    
Liabilities:    
Contingent consideration — acquisitions 0 0
Level 2 | Other liabilities — derivatives    
Liabilities:    
Other liabilities — derivatives 11 3
Level 2 | Fixed maturities    
Assets:    
Fair Value 10,505 10,182
Trading fixed maturities 67 66
Level 2 | U.S. government and government agencies    
Assets:    
Fair Value 4 4
Level 2 | States, municipalities and political subdivisions    
Assets:    
Fair Value 785 831
Level 2 | Foreign government    
Assets:    
Fair Value 237 238
Level 2 | Residential MBS    
Assets:    
Fair Value 3,157 2,744
Level 2 | Collateralized loan obligations    
Assets:    
Fair Value 1,180 1,160
Level 2 | Other asset-backed securities    
Assets:    
Fair Value 2,219 2,215
Level 2 | Corporate and other    
Assets:    
Fair Value 2,923 2,990
Level 2 | Equity securities    
Assets:    
Fair Value 50 51
Level 2 | Other assets    
Assets:    
Other assets — derivatives 1 1
Level 3    
Assets:    
Assets of managed investment entities 15 15
Total assets accounted for at fair value 1,015 1,008
Liabilities:    
Liabilities of managed investment entities 15 15
Total liabilities accounted for at fair value 18 18
Level 3 | Contingent consideration — acquisitions    
Liabilities:    
Contingent consideration — acquisitions 3 3
Level 3 | Other liabilities — derivatives    
Liabilities:    
Other liabilities — derivatives 0 0
Level 3 | Fixed maturities    
Assets:    
Fair Value 745 712
Trading fixed maturities 13 25
Level 3 | U.S. government and government agencies    
Assets:    
Fair Value 0 0
Level 3 | States, municipalities and political subdivisions    
Assets:    
Fair Value 6 4
Level 3 | Foreign government    
Assets:    
Fair Value 0 0
Level 3 | Residential MBS    
Assets:    
Fair Value 3 3
Level 3 | Collateralized loan obligations    
Assets:    
Fair Value 0 0
Level 3 | Other asset-backed securities    
Assets:    
Fair Value 356 310
Level 3 | Corporate and other    
Assets:    
Fair Value 380 395
Level 3 | Equity securities    
Assets:    
Fair Value 242 256
Level 3 | Other assets    
Assets:    
Other assets — derivatives $ 0 $ 0