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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Dec. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 21,860 $ 11,443
Gross Unrealized Losses Less than 12 months (2,667) (185)
Fair Value, 12 Months or longer 8,463 646
Gross Unrealized Losses, 12 months or longer (1,964) (40)
Total Fair Value 30,323 12,089
Total Gross Unrealized Losses $ (4,631) $ (225)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 3,114 2,056
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 1,296 68
Total number of available-for-sale securities in an unrealized loss position | security 4,410 2,124
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 7,001 $ 4,410
Gross Unrealized Losses Less than 12 months (410) (31)
Fair Value, 12 Months or longer 3,727 146
Gross Unrealized Losses, 12 months or longer (360) (7)
Total Fair Value 10,728 4,556
Total Gross Unrealized Losses (770) (38)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 2,079 603
Gross Unrealized Losses Less than 12 months (169) (11)
Fair Value, 12 Months or longer 475 1
Gross Unrealized Losses, 12 months or longer (116) 0
Total Fair Value 2,554 604
Total Gross Unrealized Losses (285) (11)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 9,913 5,391
Gross Unrealized Losses Less than 12 months (1,735) (132)
Fair Value, 12 Months or longer 3,523 394
Gross Unrealized Losses, 12 months or longer (1,330) (26)
Total Fair Value 13,436 5,785
Total Gross Unrealized Losses (3,065) (158)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 628 3
Gross Unrealized Losses Less than 12 months (83) 0
Fair Value, 12 Months or longer 3 0
Gross Unrealized Losses, 12 months or longer (1) 0
Total Fair Value 631 3
Total Gross Unrealized Losses (84) 0
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 998 410
Gross Unrealized Losses Less than 12 months (180) (5)
Fair Value, 12 Months or longer 352 85
Gross Unrealized Losses, 12 months or longer (113) (6)
Total Fair Value 1,350 495
Total Gross Unrealized Losses (293) (11)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 992 325
Gross Unrealized Losses Less than 12 months (51) (3)
Fair Value, 12 Months or longer 184 11
Gross Unrealized Losses, 12 months or longer (22) (1)
Total Fair Value 1,176 336
Total Gross Unrealized Losses (73) (4)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 130 219
Gross Unrealized Losses Less than 12 months (7) (2)
Fair Value, 12 Months or longer 140 4
Gross Unrealized Losses, 12 months or longer (8) 0
Total Fair Value 270 223
Total Gross Unrealized Losses (15) (2)
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 119 82
Gross Unrealized Losses Less than 12 months (32) (1)
Fair Value, 12 Months or longer 59 5
Gross Unrealized Losses, 12 months or longer (14) 0
Total Fair Value 178 87
Total Gross Unrealized Losses $ (46) $ (1)