v3.25.2
Investments (Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments) (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Available For Sale Securities [Abstract]    
Investment, Type [Extensible Enumeration] Fixed Maturities [Member] Fixed Maturities [Member]
Less than 12 months, fair value $ 64 $ 106
Less than 12 months, unrealized losses (2) (4)
12 months or longer, fair value 596 634
12 months or longer, unrealized losses (136) (156)
Total, fair value 660 740
Tota, unrealized losses (138) (160)
U.S. Treasury And Government Agency [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 14 41
Less than 12 months, unrealized losses 0 (1)
12 months or longer, fair value 121 123
12 months or longer, unrealized losses (12) (18)
Total, fair value 135 164
Tota, unrealized losses (12) (19)
State and municipal bonds [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 6 15
Less than 12 months, unrealized losses 0 (1)
12 months or longer, fair value 61 63
12 months or longer, unrealized losses (9) (10)
Total, fair value 67 78
Tota, unrealized losses (9) (11)
Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 0 5
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 5 5
12 months or longer, unrealized losses (2) (2)
Total, fair value 5 10
Tota, unrealized losses (2) (2)
Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 11 25
Less than 12 months, unrealized losses (2) (1)
12 months or longer, fair value 277 302
12 months or longer, unrealized losses (97) (105)
Total, fair value 288 327
Tota, unrealized losses (99) (106)
Residential Mortgage backed Agency [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 0 5
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 95 100
12 months or longer, unrealized losses (13) (16)
Total, fair value 95 105
Tota, unrealized losses (13) (16)
Residential Mortgage Backed Non Agency [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 0 6
Less than 12 months, unrealized losses 0 (1)
12 months or longer, fair value 6 21
12 months or longer, unrealized losses (1) (4)
Total, fair value 6 27
Tota, unrealized losses (1) (5)
Commercial mortgage backed Securities [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 2  
Less than 12 months, unrealized losses 0  
12 months or longer, fair value 5  
12 months or longer, unrealized losses 0  
Total, fair value 7  
Tota, unrealized losses 0  
Collateralized debt obligations [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 12 6
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 0 8
12 months or longer, unrealized losses 0 0
Total, fair value 12 14
Tota, unrealized losses 0 0
Other asset backed [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 19 3
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 26 12
12 months or longer, unrealized losses (2) (1)
Total, fair value 45 15
Tota, unrealized losses $ (2) $ (1)