v3.26.1
Deferred Policy Acquisition Costs - Deferred Policy Acquisition Costs and Asset Reconciliation (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period $ 1,384 $ 1,297 $ 1,344 $ 1,242
Capitalized deferred policy acquisition costs 546 523 1,069 1,020
Amortized deferred policy acquisition costs (488) (453) (971) (895)
Deferred policy acquisition costs asset, end of period 1,442 1,367 1,442 1,367
Consolidated Property And Casualty Insurance        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period 1,011 937 974 886
Capitalized deferred policy acquisition costs 534 513 1,046 998
Amortized deferred policy acquisition costs (480) (445) (955) (879)
Deferred policy acquisition costs asset, end of period 1,065 1,005 1,065 1,005
Life Insurance Segment        
Movement Analysis of Deferred Policy Acquisition Costs        
Deferred policy acquisition costs asset, beginning of period 373 360 370 356
Capitalized deferred policy acquisition costs 12 10 23 22
Amortized deferred policy acquisition costs (8) (8) (16) (16)
Deferred policy acquisition costs asset, end of period $ 377 $ 362 $ 377 $ 362