v3.26.1
Investments - Schedule of Current and Long-Term Fixed Maturity Securities, Available-For-Sale (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost $ 27,225 $ 26,889
Gross Unrealized Gains 388 631
Gross Unrealized Losses (580) (494)
Allowance For Credit Losses (55) (21)
Estimated Fair Value 26,978 27,005
United States Government securities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 1,384 1,512
Gross Unrealized Gains 2 10
Gross Unrealized Losses (29) (19)
Allowance For Credit Losses 0 0
Estimated Fair Value 1,357 1,503
Government sponsored securities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 52 80
Gross Unrealized Gains 0 2
Gross Unrealized Losses 0 (1)
Allowance For Credit Losses 0 0
Estimated Fair Value 52 81
Foreign government securities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 13 13
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Allowance For Credit Losses 0 0
Estimated Fair Value 13 13
States, municipalities and political subdivisions, tax-exempt    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 3,483 3,701
Gross Unrealized Gains 76 76
Gross Unrealized Losses (60) (74)
Allowance For Credit Losses (3) (2)
Estimated Fair Value 3,496 3,701
Corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 13,950 13,498
Gross Unrealized Gains 222 419
Gross Unrealized Losses (176) (130)
Allowance For Credit Losses (4) (4)
Estimated Fair Value 13,992 13,783
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 3,537 3,203
Gross Unrealized Gains 21 43
Gross Unrealized Losses (155) (136)
Allowance For Credit Losses (2) (3)
Estimated Fair Value 3,401 3,107
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 1,861 2,078
Gross Unrealized Gains 13 28
Gross Unrealized Losses (34) (31)
Allowance For Credit Losses (2) (2)
Estimated Fair Value 1,838 2,073
Other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 2,945 2,804
Gross Unrealized Gains 54 53
Gross Unrealized Losses (126) (103)
Allowance For Credit Losses (44) (10)
Estimated Fair Value $ 2,829 $ 2,744