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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details)
$ in Millions
Dec. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 11,443 $ 1,550
Gross Unrealized Losses Less than 12 months (185) (39)
Fair Value, 12 Months or longer 646 36
Gross Unrealized Losses, 12 months or longer (40) 0
Total Fair Value 12,089 1,586
Total Gross Unrealized Losses $ (225) $ (39)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security 2,056 222
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security 68 11
Total number of available-for-sale securities in an unrealized loss position | security 2,124 233
Asset-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months $ 4,410 $ 477
Gross Unrealized Losses Less than 12 months (31) (18)
Fair Value, 12 Months or longer 146 0
Gross Unrealized Losses, 12 months or longer (7) 0
Total Fair Value 4,556 477
Total Gross Unrealized Losses (38) (18)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 603 51
Gross Unrealized Losses Less than 12 months (11) (3)
Fair Value, 12 Months or longer 1 0
Gross Unrealized Losses, 12 months or longer 0 0
Total Fair Value 604 51
Total Gross Unrealized Losses (11) (3)
Corporates    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 5,391 865
Gross Unrealized Losses Less than 12 months (132) (15)
Fair Value, 12 Months or longer 394 36
Gross Unrealized Losses, 12 months or longer (26) 0
Total Fair Value 5,785 901
Total Gross Unrealized Losses (158) (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 410 115
Gross Unrealized Losses Less than 12 months (5) (2)
Fair Value, 12 Months or longer 85 0
Gross Unrealized Losses, 12 months or longer (6) 0
Total Fair Value 495 115
Total Gross Unrealized Losses (11) (2)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 325 30
Gross Unrealized Losses Less than 12 months (3) (1)
Fair Value, 12 Months or longer 11 0
Gross Unrealized Losses, 12 months or longer (1) 0
Total Fair Value 336 30
Total Gross Unrealized Losses (4) (1)
U.S. Government    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 219 11
Gross Unrealized Losses Less than 12 months (2) 0
Fair Value, 12 Months or longer 4 0
Gross Unrealized Losses, 12 months or longer 0 0
Total Fair Value 223 11
Total Gross Unrealized Losses (2) $ 0
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Fair Values, Less than 12 months 82  
Gross Unrealized Losses Less than 12 months (1)  
Fair Value, 12 Months or longer 5  
Gross Unrealized Losses, 12 months or longer 0  
Total Fair Value 87  
Total Gross Unrealized Losses $ (1)