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Investments - Schedule of Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Mar. 31, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months $ 12,708 $ 10,420
Gross Unrealized Losses Less than 12 months (223) (290)
Fair Value, 12 months or longer 15,887 16,141
Gross Unrealized Losses, 12 months or longer (3,240) (3,485)
Total Fair Value 28,595 26,561
Total Gross Unrealized Losses $ (3,463) $ (3,775)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 1,961 2,005
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 2,227 2,305
Total number of available-for-sale securities in an unrealized loss position | security 4,188 4,310
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months $ 5,365 $ 1,164
Gross Unrealized Losses Less than 12 months (48) (30)
Fair Value, 12 months or longer 2,622 2,637
Gross Unrealized Losses, 12 months or longer (263) (276)
Total Fair Value 7,987 3,801
Total Gross Unrealized Losses (311) (306)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 707 727
Gross Unrealized Losses Less than 12 months (13) (11)
Fair Value, 12 months or longer 1,341 1,513
Gross Unrealized Losses, 12 months or longer (141) (175)
Total Fair Value 2,048 2,240
Total Gross Unrealized Losses (154) (186)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 5,692 6,831
Gross Unrealized Losses Less than 12 months (141) (208)
Fair Value, 12 months or longer 9,867 9,866
Gross Unrealized Losses, 12 months or longer (2,471) (2,624)
Total Fair Value 15,559 16,697
Total Gross Unrealized Losses (2,612) (2,832)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 100 105
Gross Unrealized Losses Less than 12 months (5) (4)
Fair Value, 12 months or longer 306 380
Gross Unrealized Losses, 12 months or longer (23) (25)
Total Fair Value 406 485
Total Gross Unrealized Losses (28) (29)
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 179 261
Gross Unrealized Losses Less than 12 months (9) (12)
Fair Value, 12 months or longer 1,025 1,006
Gross Unrealized Losses, 12 months or longer (222) (243)
Total Fair Value 1,204 1,267
Total Gross Unrealized Losses (231) (255)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 495 899
Gross Unrealized Losses Less than 12 months (4) (16)
Fair Value, 12 months or longer 440 460
Gross Unrealized Losses, 12 months or longer (69) (89)
Total Fair Value 935 1,359
Total Gross Unrealized Losses (73) (105)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 80 313
Gross Unrealized Losses Less than 12 months 0 (4)
Fair Value, 12 months or longer 104 122
Gross Unrealized Losses, 12 months or longer (4) (5)
Total Fair Value 184 435
Total Gross Unrealized Losses (4) (9)
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 90 120
Gross Unrealized Losses Less than 12 months (3) (5)
Fair Value, 12 months or longer 182 157
Gross Unrealized Losses, 12 months or longer (47) (48)
Total Fair Value 272 277
Total Gross Unrealized Losses $ (50) $ (53)