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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Jun. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 24,385 $ 11,443
Gross Unrealized Losses Less than 12 months (2,935) (185)
Fair Value, 12 Months or longer 2,309 646
Gross Unrealized Losses, 12 months or longer (637) (40)
Total Fair Value 26,694 12,089
Total Gross Unrealized Losses $ (3,572) $ (225)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 3,441 2,056
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 291 68
Total number of available-for-sale securities in an unrealized loss position | security 3,732 2,124
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 7,944 $ 4,410
Gross Unrealized Losses Less than 12 months (490) (31)
Fair Value, 12 Months or longer 645 146
Gross Unrealized Losses, 12 months or longer (71) (7)
Total Fair Value 8,589 4,556
Total Gross Unrealized Losses (561) (38)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 1,788 603
Gross Unrealized Losses Less than 12 months (153) (11)
Fair Value, 12 Months or longer 48 1
Gross Unrealized Losses, 12 months or longer (8) 0
Total Fair Value 1,836 604
Total Gross Unrealized Losses (161) (11)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 11,593 5,391
Gross Unrealized Losses Less than 12 months (1,960) (132)
Fair Value, 12 Months or longer 1,414 394
Gross Unrealized Losses, 12 months or longer (521) (26)
Total Fair Value 13,007 5,785
Total Gross Unrealized Losses (2,481) (158)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 677 3
Gross Unrealized Losses Less than 12 months (64) 0
Fair Value, 12 Months or longer 2 0
Gross Unrealized Losses, 12 months or longer 0 0
Total Fair Value 679 3
Total Gross Unrealized Losses (64) 0
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 1,120 410
Gross Unrealized Losses Less than 12 months (158) (5)
Fair Value, 12 Months or longer 119 85
Gross Unrealized Losses, 12 months or longer (23) (6)
Total Fair Value 1,239 495
Total Gross Unrealized Losses (181) (11)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 798 325
Gross Unrealized Losses Less than 12 months (67) (3)
Fair Value, 12 Months or longer 27 11
Gross Unrealized Losses, 12 months or longer (6) (1)
Total Fair Value 825 336
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 334 219
Gross Unrealized Losses Less than 12 months (12) (2)
Fair Value, 12 Months or longer 34 4
Gross Unrealized Losses, 12 months or longer (2) 0
Total Fair Value 368 223
Total Gross Unrealized Losses (14) (2)
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 131 82
Gross Unrealized Losses Less than 12 months (31) (1)
Fair Value, 12 Months or longer 20 5
Gross Unrealized Losses, 12 months or longer (6) 0
Total Fair Value 151 87
Total Gross Unrealized Losses $ (37) $ (1)