v3.26.1
Investments - Schedule of Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Mar. 31, 2026
USD ($)
security
Dec. 31, 2025
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months $ 17,048 $ 9,600
Gross Unrealized Losses Less than 12 months (341) (103)
Fair Value, 12 months or longer 14,649 15,352
Gross Unrealized Losses, 12 months or longer (3,199) (2,966)
Total Fair Value 31,697 24,952
Total Gross Unrealized Losses $ (3,540) $ (3,069)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 3,930 1,962
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 2,146 2,194
Total number of available-for-sale securities in an unrealized loss position | security 6,076 4,156
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months $ 6,481 $ 4,756
Gross Unrealized Losses Less than 12 months (128) (30)
Fair Value, 12 months or longer 2,023 2,160
Gross Unrealized Losses, 12 months or longer (225) (209)
Total Fair Value 8,504 6,916
Total Gross Unrealized Losses (353) (239)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 1,169 542
Gross Unrealized Losses Less than 12 months (11) (11)
Fair Value, 12 months or longer 957 1,051
Gross Unrealized Losses, 12 months or longer (111) (106)
Total Fair Value 2,126 1,593
Total Gross Unrealized Losses (122) (117)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 7,905 3,419
Gross Unrealized Losses Less than 12 months (183) (55)
Fair Value, 12 months or longer 9,712 10,097
Gross Unrealized Losses, 12 months or longer (2,513) (2,312)
Total Fair Value 17,617 13,516
Total Gross Unrealized Losses (2,696) (2,367)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 166 61
Gross Unrealized Losses Less than 12 months (4) (1)
Fair Value, 12 months or longer 311 372
Gross Unrealized Losses, 12 months or longer (23) (21)
Total Fair Value 477 433
Total Gross Unrealized Losses (27) (22)
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 234 201
Gross Unrealized Losses Less than 12 months (6) (3)
Fair Value, 12 months or longer 1,024 1,050
Gross Unrealized Losses, 12 months or longer (216) (212)
Total Fair Value 1,258 1,251
Total Gross Unrealized Losses (222) (215)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 456 208
Gross Unrealized Losses Less than 12 months (3) (2)
Fair Value, 12 months or longer 351 390
Gross Unrealized Losses, 12 months or longer (67) (67)
Total Fair Value 807 598
Total Gross Unrealized Losses (70) (69)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 551 353
Gross Unrealized Losses Less than 12 months (4) (1)
Fair Value, 12 months or longer 82 84
Gross Unrealized Losses, 12 months or longer (1) (2)
Total Fair Value 633 437
Total Gross Unrealized Losses (5) (3)
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 86 60
Gross Unrealized Losses Less than 12 months (2) 0
Fair Value, 12 months or longer 189 148
Gross Unrealized Losses, 12 months or longer (43) (37)
Total Fair Value 275 208
Total Gross Unrealized Losses $ (45) $ (37)