v3.26.3
Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period $ 1,442 $ 1,367 $ 1,344 $ 1,242
Capitalized deferred policy acquisition costs 481 469 1,550 1,489
Amortized deferred policy acquisition costs (501) (476) (1,472) (1,371)
Deferred policy acquisition costs asset, end of period 1,422 1,360 1,422 1,360
Consolidated Property And Casualty Insurance        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period 1,065 1,005 974 886
Capitalized deferred policy acquisition costs 470 458 1,516 1,456
Amortized deferred policy acquisition costs (493) (469) (1,448) (1,348)
Deferred policy acquisition costs asset, end of period 1,042 994 1,042 994
Life Insurance Segment        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period 377 362 370 356
Capitalized deferred policy acquisition costs 11 11 34 33
Amortized deferred policy acquisition costs (8) (7) (24) (23)
Deferred policy acquisition costs asset, end of period $ 380 $ 366 $ 380 $ 366