v3.26.3
Investments - Schedule of Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value for Fixed Income Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net $ 62,818 $ 58,730
Gross unrealized gains 45 777
Gross unrealized losses (2,617) (392)
Fair value 60,246 59,115
U.S. government and agencies    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net 11,701 18,165
Gross unrealized gains 0 43
Gross unrealized losses (372) (75)
Fair value 11,329 18,133
Municipal    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net 7,208 5,617
Gross unrealized gains 2 87
Gross unrealized losses (413) (61)
Fair value 6,797 5,643
Corporate    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net 37,964 30,050
Gross unrealized gains 33 585
Gross unrealized losses (1,623) (234)
Fair value 36,374 30,401
Foreign government    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net 1,722 1,464
Gross unrealized gains 3 13
Gross unrealized losses (59) (17)
Fair value 1,666 1,460
ABS    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net 2,074 1,348
Gross unrealized gains 7 8
Gross unrealized losses (23) (4)
Fair value 2,058 1,352
MBS    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net 2,149 2,086
Gross unrealized gains 0 41
Gross unrealized losses (127) (1)
Fair value $ 2,022 $ 2,126