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Investments (Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments) (Detail) - USD ($)
$ in Millions
Dec. 31, 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 $ 106 $ 58
Less than 12 months, unrealized losses (4) (1)
12 months or longer, fair value 634 796
12 months or longer, unrealized losses (156) (139)
Total, fair value 740 854
Tota, unrealized losses (160) (140)
U.S. Treasury And Government Agency [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 41 11
Less than 12 months, unrealized losses (1) 0
12 months or longer, fair value 123 143
12 months or longer, unrealized losses (18) (18)
Total, fair value 164 154
Tota, unrealized losses (19) (18)
State and municipal bonds [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 15 23
Less than 12 months, unrealized losses (1) (1)
12 months or longer, fair value 63 57
12 months or longer, unrealized losses (10) (7)
Total, fair value 78 80
Tota, unrealized losses (11) (8)
Foreign Governments [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 5 0
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 5 6
12 months or longer, unrealized losses (2) (2)
Total, fair value 10 6
Tota, unrealized losses (2) (2)
Corporate Obligations [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 25 17
Less than 12 months, unrealized losses (1) 0
12 months or longer, fair value 302 337
12 months or longer, unrealized losses (105) (90)
Total, fair value 327 354
Tota, unrealized losses (106) (90)
Residential Mortgage backed Agency [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 5 0
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 100 118
12 months or longer, unrealized losses (16) (14)
Total, fair value 105 118
Tota, unrealized losses (16) (14)
Residential Mortgage Backed Non Agency [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 6 3
Less than 12 months, unrealized losses (1) 0
12 months or longer, fair value 21 21
12 months or longer, unrealized losses (4) (5)
Total, fair value 27 24
Tota, unrealized losses (5) (5)
Commercial mortgage backed Securities [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value   4
Less than 12 months, unrealized losses   0
12 months or longer, fair value   3
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 6 0
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 8 89
12 months or longer, unrealized losses 0 (1)
Total, fair value 14 89
Tota, unrealized losses 0 (1)
Other asset backed [Member]    
Available For Sale Securities [Abstract]    
Less than 12 months, fair value 3 0
Less than 12 months, unrealized losses 0 0
12 months or longer, fair value 12 22
12 months or longer, unrealized losses (1) (2)
Total, fair value 15 22
Tota, unrealized losses $ (1) $ (2)