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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Available For Sale Securities [Abstract]    
Due in one year or less $ 573  
Due after one year through five years 162  
Due after five years through ten years 192  
Due after ten years 446  
Mortgage-backed and asset-backed 315  
Total fixed-maturity investments 1,688  
Due in one year or less 573  
Due after one year through five years 158  
Due after five years through ten years 169  
Due after ten years 362  
Mortgage-backed and asset-backed 295  
Total fixed-maturity investments $ 1,557 $ 1,931
Investment, Type [Extensible Enumeration] Fixed Maturities [Member] Fixed Maturities [Member]