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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Sep. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 6,781 $ 1,550
Gross Unrealized Losses Less than 12 months (161) (39)
Fair Value, 12 Months or longer 409 36
Gross Unrealized Losses, 12 months or longer (30) 0
Total Fair Value 7,190 1,586
Total Gross Unrealized Losses $ (191) $ (39)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 916 222
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 53 11
Total number of available-for-sale securities in an unrealized loss position | security 969 233
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 1,462 $ 477
Gross Unrealized Losses Less than 12 months (10) (18)
Fair Value, 12 Months or longer 121 0
Gross Unrealized Losses, 12 months or longer (5) 0
Total Fair Value 1,583 477
Total Gross Unrealized Losses (15) (18)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 258 51
Gross Unrealized Losses Less than 12 months (4) (3)
Fair Value, 12 Months or longer 3 0
Gross Unrealized Losses, 12 months or longer (2) 0
Total Fair Value 261 51
Total Gross Unrealized Losses (6) (3)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 4,190 865
Gross Unrealized Losses Less than 12 months (130) (15)
Fair Value, 12 Months or longer 219 36
Gross Unrealized Losses, 12 months or longer (20) 0
Total Fair Value 4,409 901
Total Gross Unrealized Losses (150) (15)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 2 1
Gross Unrealized Losses Less than 12 months 0 0
Fair Value, 12 Months or longer 0 0
Gross Unrealized Losses, 12 months or longer 0 0
Total Fair Value 2 1
Total Gross Unrealized Losses 0 0
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 234 115
Gross Unrealized Losses Less than 12 months (7) (2)
Fair Value, 12 Months or longer 53 0
Gross Unrealized Losses, 12 months or longer (2) 0
Total Fair Value 287 115
Total Gross Unrealized Losses (9) (2)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 55 30
Gross Unrealized Losses Less than 12 months (1) (1)
Fair Value, 12 Months or longer 11 0
Gross Unrealized Losses, 12 months or longer (1) 0
Total Fair Value 66 30
Total Gross Unrealized Losses (2) (1)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 567 11
Gross Unrealized Losses Less than 12 months (8) 0
Fair Value, 12 Months or longer 2 0
Gross Unrealized Losses, 12 months or longer 0 0
Total Fair Value 569 11
Total Gross Unrealized Losses (8) $ 0
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 13  
Gross Unrealized Losses Less than 12 months (1)  
Fair Value, 12 Months or longer 0  
Gross Unrealized Losses, 12 months or longer 0  
Total Fair Value 13  
Total Gross Unrealized Losses $ (1)