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Investments (Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments) (Detail) - USD ($)
$ in Millions
Sep. 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 $ 42 $ 106
Less than 12 months, unrealized losses (2) (4)
12 months or longer, fair value 596 634
12 months or longer, unrealized losses (125) (156)
Total, fair value 638 740
Tota, unrealized losses (127) (160)
U.S. Treasury And Government Agency [Member] | Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 2 41
Less than 12 months, unrealized losses 0 (1)
12 months or longer, fair value 122 123
12 months or longer, unrealized losses (10) (18)
Total, fair value 124 164
Tota, unrealized losses (10) (19)
State and municipal bonds [Member] | Fixed Maturities [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 57 63
12 months or longer, unrealized losses (8) (10)
Total, fair value 63 78
Tota, unrealized losses (8) (11)
Foreign Governments [Member] | Fixed Maturities [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 6 5
12 months or longer, unrealized losses (2) (2)
Total, fair value 6 10
Tota, unrealized losses (2) (2)
Corporate Obligations [Member] | Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 10 25
Less than 12 months, unrealized losses (2) (1)
12 months or longer, fair value 283 302
12 months or longer, unrealized losses (92) (105)
Total, fair value 293 327
Tota, unrealized losses (94) (106)
Residential Mortgage backed Agency [Member] | Fixed Maturities [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 93 100
12 months or longer, unrealized losses (12) (16)
Total, fair value 93 105
Tota, unrealized losses (12) (16)
Residential Mortgage Backed Non Agency [Member] | Fixed Maturities [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 5 21
12 months or longer, unrealized losses 0 (4)
Total, fair value 5 27
Tota, unrealized losses 0 (5)
Commercial mortgage backed Securities [Member] | Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 0  
Less than 12 months, unrealized losses 0  
12 months or longer, fair value 4  
12 months or longer, unrealized losses 0  
Total, fair value 4  
Tota, unrealized losses 0  
Collateralized debt obligations [Member] | Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 8 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 8 14
Tota, unrealized losses 0 0
Other asset backed [Member] | Fixed Maturities [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 16 3
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 26 12
12 months or longer, unrealized losses (1) (1)
Total, fair value 42 15
Tota, unrealized losses $ (1) $ (1)