v3.26.1
Investments - Schedule of Aggregate Fair Value and Gross Unrealized Loss of Fixed Maturity Securities in an Unrealized Loss Position (Details)
$ in Millions
Jun. 30, 2026
USD ($)
security
Dec. 31, 2025
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 2,726 1,207
Estimated fair value, less than 12 months $ 9,338 $ 3,594
Gross unrealized loss, less than 12 months $ (152) $ (71)
Number of securities, 12 months or greater | security 2,512 2,946
Estimated fair value, 12 months or greater $ 3,326 $ 4,208
Gross unrealized loss, 12 months or greater $ (428) $ (423)
United States Government securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 47 18
Estimated fair value, less than 12 months $ 883 $ 460
Gross unrealized loss, less than 12 months $ (13) $ (3)
Number of securities, 12 months or greater | security 13 17
Estimated fair value, 12 months or greater $ 122 $ 167
Gross unrealized loss, 12 months or greater $ (16) $ (16)
Government sponsored securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 12 4
Estimated fair value, less than 12 months $ 16 $ 0
Gross unrealized loss, less than 12 months $ 0 $ 0
Number of securities, 12 months or greater | security 11 16
Estimated fair value, 12 months or greater $ 9 $ 29
Gross unrealized loss, 12 months or greater $ 0 $ (1)
Foreign government securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 2 1
Estimated fair value, less than 12 months $ 7 $ 3
Gross unrealized loss, less than 12 months $ 0 $ 0
Number of securities, 12 months or greater | security 1 2
Estimated fair value, 12 months or greater $ 0 $ 1
Gross unrealized loss, 12 months or greater $ 0 $ 0
States, municipalities and political subdivisions, tax-exempt    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 246 213
Estimated fair value, less than 12 months $ 606 $ 486
Gross unrealized loss, less than 12 months $ (8) $ (8)
Number of securities, 12 months or greater | security 360 522
Estimated fair value, 12 months or greater $ 586 $ 848
Gross unrealized loss, 12 months or greater $ (52) $ (66)
Corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 1,565 568
Estimated fair value, less than 12 months $ 4,705 $ 1,398
Gross unrealized loss, less than 12 months $ (80) $ (22)
Number of securities, 12 months or greater | security 644 839
Estimated fair value, 12 months or greater $ 1,014 $ 1,397
Gross unrealized loss, 12 months or greater $ (96) $ (108)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 362 169
Estimated fair value, less than 12 months $ 1,159 $ 282
Gross unrealized loss, less than 12 months $ (16) $ (4)
Number of securities, 12 months or greater | security 1,151 1,164
Estimated fair value, 12 months or greater $ 905 $ 1,012
Gross unrealized loss, 12 months or greater $ (139) $ (132)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 186 80
Estimated fair value, less than 12 months $ 810 $ 308
Gross unrealized loss, less than 12 months $ (10) $ (6)
Number of securities, 12 months or greater | security 154 212
Estimated fair value, 12 months or greater $ 308 $ 479
Gross unrealized loss, 12 months or greater $ (24) $ (25)
Other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Number of securities, less than 12 months | security 306 154
Estimated fair value, less than 12 months $ 1,152 $ 657
Gross unrealized loss, less than 12 months $ (25) $ (28)
Number of securities, 12 months or greater | security 178 174
Estimated fair value, 12 months or greater $ 382 $ 275
Gross unrealized loss, 12 months or greater $ (101) $ (75)