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Investments - Schedule of Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months $ 2,782 $ 5,841
Gross Unrealized Losses Less than 12 months (40) (302)
Fair Value, 12 months or longer 18,056 20,908
Gross Unrealized Losses, 12 months or longer (2,802) (3,291)
Total Fair Value 20,838 26,749
Total Gross Unrealized Losses $ (2,842) $ (3,593)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 585 1,035
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 2,393 2,846
Total number of available-for-sale securities in an unrealized loss position | security 2,978 3,881
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months $ 583 $ 1,707
Gross Unrealized Losses Less than 12 months (19) (56)
Fair Value, 12 months or longer 3,447 5,835
Gross Unrealized Losses, 12 months or longer (237) (404)
Total Fair Value 4,030 7,542
Total Gross Unrealized Losses (256) (460)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 209 819
Gross Unrealized Losses Less than 12 months (5) (53)
Fair Value, 12 months or longer 1,682 1,922
Gross Unrealized Losses, 12 months or longer (168) (235)
Total Fair Value 1,891 2,741
Total Gross Unrealized Losses (173) (288)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 1,382 2,387
Gross Unrealized Losses Less than 12 months (8) (134)
Fair Value, 12 months or longer 10,698 10,739
Gross Unrealized Losses, 12 months or longer (2,084) (2,283)
Total Fair Value 12,080 13,126
Total Gross Unrealized Losses (2,092) (2,417)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 47 60
Gross Unrealized Losses Less than 12 months (1) (2)
Fair Value, 12 months or longer 393 483
Gross Unrealized Losses, 12 months or longer (18) (51)
Total Fair Value 440 543
Total Gross Unrealized Losses (19) (53)
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 82 399
Gross Unrealized Losses Less than 12 months (1) (49)
Fair Value, 12 months or longer 1,089 920
Gross Unrealized Losses, 12 months or longer (186) (179)
Total Fair Value 1,171 1,319
Total Gross Unrealized Losses (187) (228)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 188 336
Gross Unrealized Losses Less than 12 months (3) (5)
Fair Value, 12 months or longer 447 662
Gross Unrealized Losses, 12 months or longer (68) (89)
Total Fair Value 635 998
Total Gross Unrealized Losses (71) (94)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 268 84
Gross Unrealized Losses Less than 12 months (1) 0
Fair Value, 12 months or longer 130 159
Gross Unrealized Losses, 12 months or longer (5) (9)
Total Fair Value 398 243
Total Gross Unrealized Losses (6) (9)
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Value, Less than 12 months 23 49
Gross Unrealized Losses Less than 12 months (2) (3)
Fair Value, 12 months or longer 170 188
Gross Unrealized Losses, 12 months or longer (36) (41)
Total Fair Value 193 237
Total Gross Unrealized Losses $ (38) $ (44)