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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 10,420 $ 5,841
Gross Unrealized Losses Less than 12 months (290) (302)
Fair Value, 12 Months or longer 16,141 20,908
Gross Unrealized Losses, 12 months or longer (3,485) (3,291)
Total Fair Value 26,561 26,749
Total Gross Unrealized Losses $ (3,775) $ (3,593)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 2,005 1,035
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 2,305 2,846
Total number of available-for-sale securities in an unrealized loss position | security 4,310 3,881
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 1,164 $ 1,707
Gross Unrealized Losses Less than 12 months (30) (56)
Fair Value, 12 Months or longer 2,637 5,835
Gross Unrealized Losses, 12 months or longer (276) (404)
Total Fair Value 3,801 7,542
Total Gross Unrealized Losses (306) (460)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 727 819
Gross Unrealized Losses Less than 12 months (11) (53)
Fair Value, 12 Months or longer 1,513 1,922
Gross Unrealized Losses, 12 months or longer (175) (235)
Total Fair Value 2,240 2,741
Total Gross Unrealized Losses (186) (288)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 6,831 2,387
Gross Unrealized Losses Less than 12 months (208) (134)
Fair Value, 12 Months or longer 9,866 10,739
Gross Unrealized Losses, 12 months or longer (2,624) (2,283)
Total Fair Value 16,697 13,126
Total Gross Unrealized Losses (2,832) (2,417)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 105 60
Gross Unrealized Losses Less than 12 months (4) (2)
Fair Value, 12 Months or longer 380 483
Gross Unrealized Losses, 12 months or longer (25) (51)
Total Fair Value 485 543
Total Gross Unrealized Losses (29) (53)
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 261 399
Gross Unrealized Losses Less than 12 months (12) (49)
Fair Value, 12 Months or longer 1,006 920
Gross Unrealized Losses, 12 months or longer (243) (179)
Total Fair Value 1,267 1,319
Total Gross Unrealized Losses (255) (228)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 899 336
Gross Unrealized Losses Less than 12 months (16) (5)
Fair Value, 12 Months or longer 460 662
Gross Unrealized Losses, 12 months or longer (89) (89)
Total Fair Value 1,359 998
Total Gross Unrealized Losses (105) (94)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 313 84
Gross Unrealized Losses Less than 12 months (4) 0
Fair Value, 12 Months or longer 122 159
Gross Unrealized Losses, 12 months or longer (5) (9)
Total Fair Value 435 243
Total Gross Unrealized Losses (9) (9)
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 120 49
Gross Unrealized Losses Less than 12 months (5) (3)
Fair Value, 12 Months or longer 157 188
Gross Unrealized Losses, 12 months or longer (48) (41)
Total Fair Value 277 237
Total Gross Unrealized Losses $ (53) $ (44)