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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period $ 1,367 $ 1,229 $ 1,242 $ 1,093
Capitalized deferred policy acquisition costs 469 447 1,489 1,351
Amortized deferred policy acquisition costs (476) (435) (1,371) (1,203)
Deferred policy acquisition costs asset, end of period 1,360 1,241 1,360 1,241
Consolidated Property And Casualty Insurance        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period 1,005 878 886 749
Capitalized deferred policy acquisition costs 458 436 1,456 1,318
Amortized deferred policy acquisition costs (469) (427) (1,348) (1,180)
Deferred policy acquisition costs asset, end of period 994 887 994 887
Life Insurance Segment        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period 362 351 356 344
Capitalized deferred policy acquisition costs 11 11 33 33
Amortized deferred policy acquisition costs (7) (8) (23) (23)
Deferred policy acquisition costs asset, end of period $ 366 $ 354 $ 366 $ 354