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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Mar. 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 $ 6,970 $ 5,841
Gross Unrealized Losses Less than 12 months (251) (302)
Fair Value, 12 Months or longer 20,098 20,908
Gross Unrealized Losses, 12 months or longer (3,386) (3,291)
Total Fair Value 27,068 26,749
Total Gross Unrealized Losses $ (3,637) $ (3,593)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 1,371 1,035
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 2,775 2,846
Total number of available-for-sale securities in an unrealized loss position | security 4,146 3,881
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 1,558 $ 1,707
Gross Unrealized Losses Less than 12 months (41) (56)
Fair Value, 12 Months or longer 4,568 5,835
Gross Unrealized Losses, 12 months or longer (358) (404)
Total Fair Value 6,126 7,542
Total Gross Unrealized Losses (399) (460)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 470 819
Gross Unrealized Losses Less than 12 months (8) (53)
Fair Value, 12 Months or longer 2,048 1,922
Gross Unrealized Losses, 12 months or longer (203) (235)
Total Fair Value 2,518 2,741
Total Gross Unrealized Losses (211) (288)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 3,645 2,387
Gross Unrealized Losses Less than 12 months (136) (134)
Fair Value, 12 Months or longer 11,062 10,739
Gross Unrealized Losses, 12 months or longer (2,449) (2,283)
Total Fair Value 14,707 13,126
Total Gross Unrealized Losses (2,585) (2,417)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 71 60
Gross Unrealized Losses Less than 12 months (2) (2)
Fair Value, 12 Months or longer 464 483
Gross Unrealized Losses, 12 months or longer (36) (51)
Total Fair Value 535 543
Total Gross Unrealized Losses (38) (53)
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 340 399
Gross Unrealized Losses Less than 12 months (51) (49)
Fair Value, 12 Months or longer 935 920
Gross Unrealized Losses, 12 months or longer (186) (179)
Total Fair Value 1,275 1,319
Total Gross Unrealized Losses (237) (228)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 507 336
Gross Unrealized Losses Less than 12 months (9) (5)
Fair Value, 12 Months or longer 687 662
Gross Unrealized Losses, 12 months or longer (99) (89)
Total Fair Value 1,194 998
Total Gross Unrealized Losses (108) (94)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 337 84
Gross Unrealized Losses Less than 12 months (2) 0
Fair Value, 12 Months or longer 147 159
Gross Unrealized Losses, 12 months or longer (9) (9)
Total Fair Value 484 243
Total Gross Unrealized Losses (11) (9)
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 42 49
Gross Unrealized Losses Less than 12 months (2) (3)
Fair Value, 12 Months or longer 187 188
Gross Unrealized Losses, 12 months or longer (46) (41)
Total Fair Value 229 237
Total Gross Unrealized Losses $ (48) $ (44)