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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Jun. 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 $ 4,968 $ 1,550
Gross Unrealized Losses Less than 12 months (134) (39)
Fair Value, 12 Months or longer 223 36
Gross Unrealized Losses, 12 months or longer (16) 0
Total Fair Value 5,191 1,586
Total Gross Unrealized Losses $ (150) $ (39)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 514 222
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 41 11
Total number of available-for-sale securities in an unrealized loss position | security 555 233
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 1,478 $ 477
Gross Unrealized Losses Less than 12 months (15) (18)
Fair Value, 12 Months or longer 98 0
Gross Unrealized Losses, 12 months or longer (3) 0
Total Fair Value 1,576 477
Total Gross Unrealized Losses (18) (18)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 112 51
Gross Unrealized Losses Less than 12 months (1) (3)
Fair Value, 12 Months or longer 1 0
Gross Unrealized Losses, 12 months or longer (2) 0
Total Fair Value 113 51
Total Gross Unrealized Losses (3) (3)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 3,040 865
Gross Unrealized Losses Less than 12 months (111) (15)
Fair Value, 12 Months or longer 48 36
Gross Unrealized Losses, 12 months or longer (8) 0
Total Fair Value 3,088 901
Total Gross Unrealized Losses (119) (15)
Hybrids    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 3 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 3 1
Total Gross Unrealized Losses 0 0
Municipals    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 216 115
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 269 115
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 10 30
Gross Unrealized Losses Less than 12 months 0 (1)
Fair Value, 12 Months or longer 23 0
Gross Unrealized Losses, 12 months or longer (1) 0
Total Fair Value 33 30
Total Gross Unrealized Losses (1) (1)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 95 11
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 95 11
Total Gross Unrealized Losses 0 $ 0
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 14  
Gross Unrealized Losses Less than 12 months 0  
Fair Value, 12 Months or longer 0  
Gross Unrealized Losses, 12 months or longer 0  
Total Fair Value 14  
Total Gross Unrealized Losses $ 0