v3.24.2.u1
Investments (Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments) (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Available For Sale Securities [Abstract]    
Investment, Type [Extensible Enumeration] Fixed Maturities [Member] Fixed Maturities [Member]
Less than 12 months, fair value $ 123 $ 58
Less than 12 months, unrealized losses (2) (1)
12 months or longer, fair value 685 796
12 months or longer, unrealized losses (159) (139)
Total, fair value 808 854
Tota, unrealized losses (161) (140)
U.S. Treasury And Government Agency [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 22 11
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 139 143
12 months or longer, unrealized losses (20) (18)
Total, fair value 161 154
Tota, unrealized losses (20) (18)
State and municipal bonds [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 19 23
Less than 12 months, unrealized losses (1) (1)
12 months or longer, fair value 63 57
12 months or longer, unrealized losses (9) (7)
Total, fair value 82 80
Tota, unrealized losses (10) (8)
Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 2 0
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 6 6
12 months or longer, unrealized losses (2) (2)
Total, fair value 8 6
Tota, unrealized losses (2) (2)
Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 48 17
Less than 12 months, unrealized losses (1) 0
12 months or longer, fair value 313 337
12 months or longer, unrealized losses (104) (90)
Total, fair value 361 354
Tota, unrealized losses (105) (90)
Residential Mortgage backed Agency [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 9 0
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 107 118
12 months or longer, unrealized losses (17) (14)
Total, fair value 116 118
Tota, unrealized losses (17) (14)
Residential Mortgage Backed Non Agency [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 3 3
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 21 21
12 months or longer, unrealized losses (6) (5)
Total, fair value 24 24
Tota, unrealized losses (6) (5)
Commercial mortgage backed Securities [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 10 4
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 0 3
12 months or longer, unrealized losses 0 0
Total, fair value 10 7
Tota, unrealized losses 0 0
Collateralized debt obligations [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 10 0
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 21 89
12 months or longer, unrealized losses 0 (1)
Total, fair value 31 89
Tota, unrealized losses 0 (1)
Other asset backed [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 0 0
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 15 22
12 months or longer, unrealized losses (1) (2)
Total, fair value 15 22
Tota, unrealized losses $ (1) $ (2)