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Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period $ 1,229 $ 1,109 $ 1,093 $ 1,013
Capitalized deferred policy acquisition costs 447 365 1,351 1,166
Amortized deferred policy acquisition costs (435) (373) (1,203) (1,078)
Deferred policy acquisition costs asset, end of period 1,241 1,101 1,241 1,101
Consolidated Property And Casualty Insurance        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period 878 771 749 682
Capitalized deferred policy acquisition costs 436 355 1,318 1,134
Amortized deferred policy acquisition costs (427) (366) (1,180) (1,056)
Deferred policy acquisition costs asset, end of period 887 760 887 760
Life Insurance Segment        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period 351 338 344 331
Capitalized deferred policy acquisition costs 11 10 33 32
Amortized deferred policy acquisition costs (8) (7) (23) (22)
Deferred policy acquisition costs asset, end of period $ 354 $ 341 $ 354 $ 341