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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Jun. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 13,081 $ 21,860
Gross Unrealized Losses Less than 12 months (712) (2,667)
Fair Value, 12 Months or longer 19,690 8,463
Gross Unrealized Losses, 12 months or longer (3,664) (1,964)
Total Fair Value 32,771 30,323
Total Gross Unrealized Losses $ (4,376) $ (4,631)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 2,196 3,114
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 2,725 1,296
Total number of available-for-sale securities in an unrealized loss position | security 4,921 4,410
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 4,219 $ 7,001
Gross Unrealized Losses Less than 12 months (182) (410)
Fair Value, 12 Months or longer 6,220 3,727
Gross Unrealized Losses, 12 months or longer (517) (360)
Total Fair Value 10,439 10,728
Total Gross Unrealized Losses (699) (770)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 1,593 2,079
Gross Unrealized Losses Less than 12 months (103) (169)
Fair Value, 12 Months or longer 1,665 475
Gross Unrealized Losses, 12 months or longer (243) (116)
Total Fair Value 3,258 2,554
Total Gross Unrealized Losses (346) (285)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 5,267 9,913
Gross Unrealized Losses Less than 12 months (317) (1,735)
Fair Value, 12 Months or longer 9,522 3,523
Gross Unrealized Losses, 12 months or longer (2,517) (1,330)
Total Fair Value 14,789 13,436
Total Gross Unrealized Losses (2,834) (3,065)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 194 628
Gross Unrealized Losses Less than 12 months (15) (83)
Fair Value, 12 Months or longer 457 3
Gross Unrealized Losses, 12 months or longer (58) (1)
Total Fair Value 651 631
Total Gross Unrealized Losses (73) (84)
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 557 998
Gross Unrealized Losses Less than 12 months (69) (180)
Fair Value, 12 Months or longer 831 352
Gross Unrealized Losses, 12 months or longer (183) (113)
Total Fair Value 1,388 1,350
Total Gross Unrealized Losses (252) (293)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 1,035 992
Gross Unrealized Losses Less than 12 months (17) (51)
Fair Value, 12 Months or longer 620 184
Gross Unrealized Losses, 12 months or longer (93) (22)
Total Fair Value 1,655 1,176
Total Gross Unrealized Losses (110) (73)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 150 130
Gross Unrealized Losses Less than 12 months (3) (7)
Fair Value, 12 Months or longer 189 140
Gross Unrealized Losses, 12 months or longer (12) (8)
Total Fair Value 339 270
Total Gross Unrealized Losses (15) (15)
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 66 119
Gross Unrealized Losses Less than 12 months (6) (32)
Fair Value, 12 Months or longer 186 59
Gross Unrealized Losses, 12 months or longer (41) (14)
Total Fair Value 252 178
Total Gross Unrealized Losses $ (47) $ (46)