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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Mar. 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 $ 14,686 $ 21,860
Gross Unrealized Losses Less than 12 months (911) (2,667)
Fair Value, 12 Months or longer 16,466 8,463
Gross Unrealized Losses, 12 months or longer (3,310) (1,964)
Total Fair Value 31,152 30,323
Total Gross Unrealized Losses $ (4,221) $ (4,631)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 2,402 3,114
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 2,270 1,296
Total number of available-for-sale securities in an unrealized loss position | security 4,672 4,410
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 5,347 $ 7,001
Gross Unrealized Losses Less than 12 months (307) (410)
Fair Value, 12 Months or longer 4,520 3,727
Gross Unrealized Losses, 12 months or longer (448) (360)
Total Fair Value 9,867 10,728
Total Gross Unrealized Losses (755) (770)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 2,249 2,079
Gross Unrealized Losses Less than 12 months (122) (169)
Fair Value, 12 Months or longer 1,236 475
Gross Unrealized Losses, 12 months or longer (214) (116)
Total Fair Value 3,485 2,554
Total Gross Unrealized Losses (336) (285)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 5,501 9,913
Gross Unrealized Losses Less than 12 months (392) (1,735)
Fair Value, 12 Months or longer 8,553 3,523
Gross Unrealized Losses, 12 months or longer (2,263) (1,330)
Total Fair Value 14,054 13,436
Total Gross Unrealized Losses (2,655) (3,065)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 346 628
Gross Unrealized Losses Less than 12 months (29) (83)
Fair Value, 12 Months or longer 321 3
Gross Unrealized Losses, 12 months or longer (53) (1)
Total Fair Value 667 631
Total Gross Unrealized Losses (82) (84)
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 483 998
Gross Unrealized Losses Less than 12 months (37) (180)
Fair Value, 12 Months or longer 907 352
Gross Unrealized Losses, 12 months or longer (196) (113)
Total Fair Value 1,390 1,350
Total Gross Unrealized Losses (233) (293)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 708 992
Gross Unrealized Losses Less than 12 months (22) (51)
Fair Value, 12 Months or longer 540 184
Gross Unrealized Losses, 12 months or longer (81) (22)
Total Fair Value 1,248 1,176
Total Gross Unrealized Losses (103) (73)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 29 130
Gross Unrealized Losses Less than 12 months 0 (7)
Fair Value, 12 Months or longer 206 140
Gross Unrealized Losses, 12 months or longer (11) (8)
Total Fair Value 235 270
Total Gross Unrealized Losses (11) (15)
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 23 119
Gross Unrealized Losses Less than 12 months (2) (32)
Fair Value, 12 Months or longer 183 59
Gross Unrealized Losses, 12 months or longer (44) (14)
Total Fair Value 206 178
Total Gross Unrealized Losses $ (46) $ (46)