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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Jun. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 7,251 $ 5,841
Gross Unrealized Losses Less than 12 months (179) (302)
Fair Value, 12 Months or longer 20,226 20,908
Gross Unrealized Losses, 12 months or longer (3,619) (3,291)
Total Fair Value 27,477 26,749
Total Gross Unrealized Losses $ (3,798) $ (3,593)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 1,578 1,035
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 2,807 2,846
Total number of available-for-sale securities in an unrealized loss position | security 4,385 3,881
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 1,322 $ 1,707
Gross Unrealized Losses Less than 12 months (33) (56)
Fair Value, 12 Months or longer 3,951 5,835
Gross Unrealized Losses, 12 months or longer (317) (404)
Total Fair Value 5,273 7,542
Total Gross Unrealized Losses (350) (460)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 795 819
Gross Unrealized Losses Less than 12 months (6) (53)
Fair Value, 12 Months or longer 2,065 1,922
Gross Unrealized Losses, 12 months or longer (198) (235)
Total Fair Value 2,860 2,741
Total Gross Unrealized Losses (204) (288)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 4,080 2,387
Gross Unrealized Losses Less than 12 months (85) (134)
Fair Value, 12 Months or longer 11,544 10,739
Gross Unrealized Losses, 12 months or longer (2,695) (2,283)
Total Fair Value 15,624 13,126
Total Gross Unrealized Losses (2,780) (2,417)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 73 60
Gross Unrealized Losses Less than 12 months (2) (2)
Fair Value, 12 Months or longer 484 483
Gross Unrealized Losses, 12 months or longer (42) (51)
Total Fair Value 557 543
Total Gross Unrealized Losses (44) (53)
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 248 399
Gross Unrealized Losses Less than 12 months (41) (49)
Fair Value, 12 Months or longer 999 920
Gross Unrealized Losses, 12 months or longer (208) (179)
Total Fair Value 1,247 1,319
Total Gross Unrealized Losses (249) (228)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 448 336
Gross Unrealized Losses Less than 12 months (6) (5)
Fair Value, 12 Months or longer 792 662
Gross Unrealized Losses, 12 months or longer (103) (89)
Total Fair Value 1,240 998
Total Gross Unrealized Losses (109) (94)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 226 84
Gross Unrealized Losses Less than 12 months (2) 0
Fair Value, 12 Months or longer 192 159
Gross Unrealized Losses, 12 months or longer (9) (9)
Total Fair Value 418 243
Total Gross Unrealized Losses (11) (9)
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 59 49
Gross Unrealized Losses Less than 12 months (4) (3)
Fair Value, 12 Months or longer 199 188
Gross Unrealized Losses, 12 months or longer (47) (41)
Total Fair Value 258 237
Total Gross Unrealized Losses $ (51) $ (44)