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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 5,841 $ 21,860
Gross Unrealized Losses Less than 12 months (302) (2,667)
Fair Value, 12 Months or longer 20,908 8,463
Gross Unrealized Losses, 12 months or longer (3,291) (1,964)
Total Fair Value 26,749 30,323
Total Gross Unrealized Losses $ (3,593) $ (4,631)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 1,035 3,114
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 2,846 1,296
Total number of available-for-sale securities in an unrealized loss position | security 3,881 4,410
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 1,707 $ 7,001
Gross Unrealized Losses Less than 12 months (56) (410)
Fair Value, 12 Months or longer 5,835 3,727
Gross Unrealized Losses, 12 months or longer (404) (360)
Total Fair Value 7,542 10,728
Total Gross Unrealized Losses (460) (770)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 819 2,079
Gross Unrealized Losses Less than 12 months (53) (169)
Fair Value, 12 Months or longer 1,922 475
Gross Unrealized Losses, 12 months or longer (235) (116)
Total Fair Value 2,741 2,554
Total Gross Unrealized Losses (288) (285)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 2,387 9,913
Gross Unrealized Losses Less than 12 months (134) (1,735)
Fair Value, 12 Months or longer 10,739 3,523
Gross Unrealized Losses, 12 months or longer (2,283) (1,330)
Total Fair Value 13,126 13,436
Total Gross Unrealized Losses (2,417) (3,065)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 60 628
Gross Unrealized Losses Less than 12 months (2) (83)
Fair Value, 12 Months or longer 483 3
Gross Unrealized Losses, 12 months or longer (51) (1)
Total Fair Value 543 631
Total Gross Unrealized Losses (53) (84)
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 399 998
Gross Unrealized Losses Less than 12 months (49) (180)
Fair Value, 12 Months or longer 920 352
Gross Unrealized Losses, 12 months or longer (179) (113)
Total Fair Value 1,319 1,350
Total Gross Unrealized Losses (228) (293)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 336 992
Gross Unrealized Losses Less than 12 months (5) (51)
Fair Value, 12 Months or longer 662 184
Gross Unrealized Losses, 12 months or longer (89) (22)
Total Fair Value 998 1,176
Total Gross Unrealized Losses (94) (73)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 84 130
Gross Unrealized Losses Less than 12 months 0 (7)
Fair Value, 12 Months or longer 159 140
Gross Unrealized Losses, 12 months or longer (9) (8)
Total Fair Value 243 270
Total Gross Unrealized Losses (9) (15)
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 49 119
Gross Unrealized Losses Less than 12 months (3) (32)
Fair Value, 12 Months or longer 188 59
Gross Unrealized Losses, 12 months or longer (41) (14)
Total Fair Value 237 178
Total Gross Unrealized Losses $ (44) $ (46)